{"Name":"Multiple congenital anomalies-hypotonia-seizures syndrome 2","DiseaseID__c":"GARD:0012777","id":12777,"encodedName":"multiple-congenital-anomalies-hypotonia-seizures-syndrome-2","IsDeleted":false,"Disease_Name_Full__c":"Multiple congenital anomalies-hypotonia-seizures syndrome 2","Xref_IDs__c":"C3275508; DOID:0080139; MEDGEN:477139; MONDO:0010466; OMIM:300868; ORPHA:300496","USA_Estimate__c":"1,000","No_of_Specialist_Tagsa__c":5,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":0,"No_of_HHS_records__c":0,"World_Estimate__c":"1 to 8,000","No_of_HRSA_records__c":0,"Evidence_Based_Score__c":0,"No_of_Disease_Descriptions__c":4,"Disease_Characteristics_Score__c":8,"No_of_Age_at_Onset__c":3,"Description_Source__c":"MONDO:0010466","Disease_Description__c":"Any multiple congenital anomalies/dysmorphic syndrome-intellectual disability in which the cause of the disease is a mutation in the PIGA gene.","GARD_Name__c":"Multiple congenital anomalies-hypotonia-seizures syndrome 2","GARD_Synonym__c":"dee20; developmental and epileptic encephalopathy 20; epileptic encephalopathy, early infantile, 20; glycosylphosphatidylinositol biosynthesis defect 4; gpibd4; mcahs type 2; mcahs2; multiple congenital anomalies-hypotonia-seizures syndrome 2, x-linked recessive; multiple congenital anomalies-hypotonia-seizures syndrome type 2; multiple congenital anomalies/dysmorphic syndrome-intellectual disability caused by mutation in piga; piga multiple congenital anomalies/dysmorphic syndrome-intellectual disability","Curated_Disease_Description_Source__c":"GARD:0012777","Curated_Disease_Description__c":"Multiple congenital anomalies-hypotonia-seizures syndrome type 2 (MCAHS2) is a genetic neurodevelopmental disorder characterized by distinctive facial features, low muscle tone (hypotonia) at birth, myoclonic seizures (which cause jerks or twitches of the upper body, arms, or legs), and various other problems involving the central nervous system, heart, and urinary system. Specific symptoms (especially those not involving the nervous system) and severity vary from person to person, but most children develop severe developmental delay and intellectual disability. This condition is caused by genetic changes in the PIGA gene on the X chromosome and inheritance is X-linked recessive, so it typically affects boys. However, in some cases, MCAHS2 is not inherited from a parent and is the result of a new genetic change occurring for the first time in a person with MCAHS2 (a de novo genetic change).","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"1,000","Age_at_Onset_Snippet_Text__c":"during Pregnancy, at Birth, and as an Infant","SourceID__c":"ORPHA:300496","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0010466","ORPHANET_ID__c":"ORPHA:300496","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Síndrome de anomalías congénitas múltiples-hipotonía-crisis tipo 2","Spanish_Description_Source__c":null,"Spanish_Description__c":null,"Spanish_Disease_Name__c":"síndrome de anomalías congénitas múltiples-hipotonía-crisis tipo 2","Spanish_GARD_Synonym__c":"mcahs tipo 2","Category_Linearization__c":"ORPHA:93890","icd10_id__c":null,"mesh_id__c":null,"omim_id__c":null,"snomed_id__c":null,"umls_id__c":null,"GARD_Disease__c":[{"Curated_Disease_Description__c":"Multiple congenital anomalies-hypotonia-seizures syndrome type 2 (MCAHS2) is a genetic neurodevelopmental disorder characterized by distinctive facial features, low muscle tone (hypotonia) at birth, myoclonic seizures (which cause jerks or twitches of the upper body, arms, or legs), and various other problems involving the central nervous system, heart, and urinary system. Specific symptoms (especially those not involving the nervous system) and severity vary from person to person, but most children develop severe developmental delay and intellectual disability. This condition is caused by genetic changes in the PIGA gene on the X chromosome and inheritance is X-linked recessive, so it typically affects boys. However, in some cases, MCAHS2 is not inherited from a parent and is the result of a new genetic change occurring for the first time in a person with MCAHS2 (a de novo genetic change).","Curated_Disease_Description_Source__c":"GARD:0012777","GARD_Synonym__c":"dee20; developmental and epileptic encephalopathy 20; epileptic encephalopathy, early infantile, 20; glycosylphosphatidylinositol biosynthesis defect 4; gpibd4; mcahs type 2; mcahs2; multiple congenital anomalies-hypotonia-seizures syndrome 2, x-linked recessive; multiple congenital anomalies-hypotonia-seizures syndrome type 2; multiple congenital anomalies/dysmorphic syndrome-intellectual disability caused by mutation in piga; piga multiple congenital anomalies/dysmorphic syndrome-intellectual disability","Name":"Multiple congenital anomalies-hypotonia-seizures syndrome 2","Curated_USA_Estimate__c":"1,000","estimateUsa":"1,000"}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Epilepsy Foundation","Website__c":"https://www.epilepsy.com/"},{"Account_Name__c":"Epilepsy Action","Website__c":"https://www.epilepsy.org.uk/"},{"Account_Name__c":"Aaron's Ohtahara","Website__c":"https://sites.google.com/a/ohtahara.org/ohtahara2/"},{"Account_Name__c":"CDG Canada","Website__c":"https://canadacdg.com/"}],"GARD_Disease_Tag__c":[{"Tag_Name__c":"Genetics","Tag_Category__c":"Cause;Disease Category;Specialist","category_description":"Genetic diseases affect the DNA, or genetic instructions, which directs how tissues, organs, and body systems function.","curated_tag_name":"Genetic diseases"},{"Tag_Name__c":"Neurology","Tag_Category__c":"Disease Category;Specialist","category_description":"Neurological diseases affect the brain, spinal cord, cranial nerves, autonomic nerves, or other peripheral nerves.","curated_tag_name":"Neurological diseases"},{"Tag_Name__c":"Inborn Errors of Metabolism","Tag_Category__c":"Cause;Disease Category","category_description":"Inherited metabolic diseases, or inborn errors of metabolism, are a group of genetic diseases that affect the ability of the body's cells to convert food into energy.","curated_tag_name":"Inherited metabolic diseases"},{"Tag_Name__c":"Congenital Abnormality","Tag_Category__c":"Disease Category","category_description":"Birth defects are structural changes present at birth that can affect almost any part of the body, including how the body looks, works, or both.","curated_tag_name":"Birth defects"},{"Tag_Name__c":"Epilepsy","Tag_Category__c":"Account;Specialist","curated_tag_name":"Epilepsy"},{"Tag_Name__c":"Neurodevelopmental disabilities","Tag_Category__c":"Specialist","curated_tag_name":"Neurodevelopmental disabilities"},{"Tag_Name__c":"Pediatrics","Tag_Category__c":"Specialist"}],"Age_At_Onset__c":[{"Age_At_Onset__c":"Infancy","Provided_By__c":"ORPHA:300496"},{"Age_At_Onset__c":"Neonatal","Provided_By__c":"ORPHA:300496"},{"Age_At_Onset__c":"Antenatal","Provided_By__c":"ORPHA:300496"}],"Diagnosis__c":[{"Type__c":"GTR","Curie__c":"MEDGEN:C1846175"},{"Type__c":"GTR","Curie__c":"MEDGEN:C3275508"}],"External_Identifier_Disease__c":[{"URL__c":"https://raresource.nih.gov/diseases/filter/0012777","Source__c":"RareSource"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=477139","Source__c":"C3275508","Xref__c":"MEDGEN:477139"},{"URL__c":"https://www.omim.org/entry/300868","Source__c":"C3275508; MONDO:0010466; ORPHA:300496","Xref__c":"OMIM:300868"},{"URL__c":"https://www.orpha.net/en/disease/detail/300496","Source__c":"C3275508; MONDO:0010466","Xref__c":"ORPHA:300496"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C3275508","Source__c":"C3275508","Xref__c":"C3275508"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A0080139","Source__c":"MONDO:0010466","Xref__c":"DOID:0080139"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0010466","Source__c":"GARD:0012777","Xref__c":"MONDO:0010466"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"PIGA","GHR_URL__c":"https://medlineplus.gov/genetics/gene/piga","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["X-linked recessive"],"GARD_Disease_Feature__c":[{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Excess skin around the neck, often lying in horizontal folds.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005989","HPO_Synonym__c":"Excess neck skin; Excess skin over the neck; Excessive nuchal skin; Redundant neck skin; Redundant nuchal skin; Redundant skin folds of neck; Redundant skin over the neck","HPO_Name__c":"Redundant neck skin","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A height below that which is expected according to age and sex norms. Although there is no universally accepted definition of short stature, many refer to \\\"short stature\\\" as height more than 2 standard deviations below the mean for age and sex (or below the 3rd percentile for age and sex dependent norms).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004322","HPO_Synonym__c":"Decreased body height; Height less than 3rd percentile; Short stature; Small stature; Stature below 3rd percentile","HPO_Name__c":"Short stature","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The presence of excess amniotic fluid in the uterus during pregnancy.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001561","HPO_Synonym__c":"High levels of amniotic fluid; Hydramnios","HPO_Name__c":"Polyhydramnios","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Spastic paralysis affecting all four limbs.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002510","HPO_Synonym__c":"Spastic quadriplegia","HPO_Name__c":"Spastic tetraplegia","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"In utero, the ductus arteriosus (DA) serves to divert ventricular output away from the lungs and toward the placenta by connecting the main pulmonary artery to the descending aorta. A patent ductus arteriosus (PDA) in the first 3 days of life is a physiologic shunt in healthy term and preterm newborn infants, and normally is substantially closed within about 24 hours after bith and completely closed after about three weeks. Failure of physiologcal closure is referred to a persistent or patent ductus arteriosus (PDA). Depending on the degree of left-to-right shunting, PDA can have clinical consequences.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001643","HPO_Synonym__c":"Ductus arteriosus; Patent ductus Botalli; PDA; Persistent arterial duct; Persistent ductus arteriosus","HPO_Name__c":"Patent ductus arteriosus","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A defect of development of the brain characterized by congenital absence of the part of the brain that includes the olfactory bulbs, tracts, and other structures associated with the sense of smell.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002139","HPO_Synonym__c":"Arhinencephaly","HPO_Name__c":"Arrhinencephaly","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006994","HPO_Name__c":"Diffuse leukoencephalopathy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"EEG with repetitive generalized sharp transient waves of a duration less than 80 msec.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012001","HPO_Name__c":"EEG with generalized polyspikes","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"For children from birth to 4 years of age the palm width is more than 2 SD above the mean; for children from 4 to 16 years of age the palm width is above the 95th centile; or, the width of the palm appears disproportionately wide for the length.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001169","HPO_Synonym__c":"Broad hand; Broad hands; Broad palm; Wide palm","HPO_Name__c":"Broad palm","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Underdevelopment of the cerebral white matter.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012430","HPO_Name__c":"Cerebral white matter hypoplasia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Profound intellectual disability (ID) is defined as a type of ID characterized by profoundly sub-average adaptive functioning and intellectual functioning, with an intelligence quotient (IQ) below 20.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002187","HPO_Synonym__c":"Intellectual disability, profound; IQ less than 20; Mental retardation, profound; Profound mental retardation","HPO_Name__c":"Profound intellectual disability","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A reduced frequency or duration of eye contact.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000817","HPO_Synonym__c":"Poor eye contact","HPO_Name__c":"Reduced eye contact","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An infection of the upper or lower respiratory tract.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011947","HPO_Synonym__c":"Respiratory infection; Respiratory tract infection","HPO_Name__c":"Respiratory tract infection","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A type of knee joint contracture in which the knee is in a fixed bent (flexed) configuration such that it cannot be straightened actively or passively.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006380","HPO_Synonym__c":"Flexion contracture of knees; Flexion contractures at both knees; Flexion contractures of knees; Flexion deformity of the knee; Knee flexion contractures; Knee flexion deformity","HPO_Name__c":"Knee flexion contracture","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A skin abnormality characterized by redness and irritation, with thick, red skin that displays flaky, silver-white patches (scales).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003765","HPO_Synonym__c":"Psoriasis","HPO_Name__c":"Psoriasiform dermatitis","Feature_System__c":"Skin System; Immune System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Width of the forehead or distance between the frontotemporales is more than two standard deviations above the mean (objective); or apparently increased distance between the two sides of the forehead.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000337","HPO_Synonym__c":"Bitemporal widening; Broad forehead; Increased bitemporal dimension; Increased bitemporal width; Increased width of the forehead; Intertemporal widening; Wide forehead","HPO_Name__c":"Broad forehead","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Wasting (atrophy) of the testicle (the male gonad) manifested by a decrease in size and potentially by a loss of fertility.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000029","HPO_Synonym__c":"Testicular degeneration","HPO_Name__c":"Testicular atrophy","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Diminished length of the neck.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000470","HPO_Synonym__c":"Decreased length of neck; Short neck","HPO_Name__c":"Short neck","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Height of the vermilion of the medial part of the lip more than 2 SD below the mean, or apparently reduced height of the vermilion of the lip in the frontal view. The vermilion is the red part of the lips (and confusingly, the vermilion itself is also often referred to as being equivalent the lips).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000233","HPO_Synonym__c":"Decreased volume of lip; Decreased volume of lip vermillion; Thin lips; Thin vermillion","HPO_Name__c":"Thin vermilion border","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Inflammation of any part of the lung parenchyma.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002090","HPO_Synonym__c":"Pneumonia","HPO_Name__c":"Pneumonia","Feature_System__c":"Respiratory system; Immune System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Hyperreflexia is the presence of hyperactive stretch reflexes of the muscles.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001347","HPO_Synonym__c":"Increased deep tendon reflexes; Increased reflexes","HPO_Name__c":"Hyperreflexia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"The abnormal accumulation of fluid in two or more fetal compartments, including ascites, pleural effusion, pericardial effusion, and skin edema.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001789","HPO_Name__c":"Hydrops fetalis","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A decreased magnitude of the sensory perception of sound.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000365","HPO_Synonym__c":"Deafness; Hearing defect; Hearing impairment; Hypacusis","HPO_Name__c":"Hearing impairment","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Distance between medial and lateral canthi is more than two standard deviations above the mean for age (objective); or, apparently increased length of the palpebral fissures.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000637","HPO_Synonym__c":"Broad opening between the eyelids; Broad palpebral fissure; Long opening between the eyelids; Long palpebral fissures; Wide opening between the eyelids; Wide palpebral fissure; Wide palpebral fissures","HPO_Name__c":"Long palpebral fissure","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Simultaneous enlargement of the liver and spleen.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001433","HPO_Synonym__c":"Enlarged liver and spleen","HPO_Name__c":"Hepatosplenomegaly","Feature_System__c":"Cardiovascular System; Immune System; Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The distal interphalangeal joint and/or the proximal interphalangeal joint of the fingers or toes cannot be extended to 180 degrees by either active or passive extension.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012385","HPO_Synonym__c":"Permanent flexion of the finger or toe","HPO_Name__c":"Camptodactyly","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Steatosis is a term used to denote lipid accumulation within hepatocytes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001397","HPO_Synonym__c":"Fatty infiltration of liver; Fatty liver; Liver steatosis; Steatosis","HPO_Name__c":"Hepatic steatosis","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Distance between the hairline (trichion) and the glabella (the most prominent point on the frontal bone above the root of the nose), in the midline, more than two SD above the mean. Alternatively, an apparently increased distance between the hairline and the glabella.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009890","HPO_Synonym__c":"High frontal hairline","HPO_Name__c":"High anterior hairline","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Cerebellar atrophy is defined as a cerebellum with initially normal structures, in a posterior fossa with normal size, which displays enlarged fissures (interfolial spaces) in comparison to the foliae secondary to loss of tissue. Cerebellar atrophy implies irreversible loss of tissue and result from an ongoing progressive disease until a final stage is reached or a single injury, e.g. an intoxication or infectious event.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001272","HPO_Synonym__c":"Atrophic cerebellum; Degeneration of cerebellum","HPO_Name__c":"Cerebellar atrophy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormally increased size of the liver.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002240","HPO_Synonym__c":"Enlarged liver","HPO_Name__c":"Hepatomegaly","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An abnormality of the skin characterized the presence of excessive amounts of dry surface scales on the skin resulting from an abnormality of keratinization.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008064","HPO_Synonym__c":"Ichthyosiform abnormality of the skin; Ichthyotic skin","HPO_Name__c":"Ichthyosis","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Distention of the abdomen.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003270","HPO_Synonym__c":"Abdominal bloating; Abdominal distension; Abdominal swelling; Belly bloating; Bloating; Distended abdomen","HPO_Name__c":"Abdominal distention","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A bilateral form of fetal pyelectasis.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011129","HPO_Synonym__c":"Bilateral fetal pyelectasia","HPO_Name__c":"Bilateral fetal pyelectasis","HPO_Feature_Type__c":"Imaging_Ultrasound_Fetal"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Absence or underdevelopment of the cerebral white matter.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012429","HPO_Synonym__c":"Absent/small cerebral white matter; Absent/underdeveloped cerebral white matter","HPO_Name__c":"Aplasia/Hypoplasia of the cerebral white matter","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A reduced degree of voluntary and involuntary facial movements involved in responded to others or expressing emotions.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004673","HPO_Synonym__c":"Decreased facial expression","HPO_Name__c":"Decreased facial expression","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"Occipitofrontal (head) circumference greater than 97th centile compared to appropriate, age matched, sex-matched normal standards. Alternatively, a apparently increased size of the cranium.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000256","HPO_Synonym__c":"Increased size of cranium; Increased size of skull; Large head; Large head circumference; Macrocephalus; Macrocrania; Megacephaly","HPO_Name__c":"Macrocephaly","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality of the skeleton of foot.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001760","HPO_Synonym__c":"Abnormal feet structure; Abnormality of the feet; Abnormality of the foot; Foot deformities; Foot deformity","HPO_Name__c":"Abnormal foot morphology","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Accumulation of fluid in the peritoneal cavity (between the layers of the peritoneum that lines the abdomen).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001541","HPO_Synonym__c":"Accumulation of fluid in the abdomen; Peritoneal effusion","HPO_Name__c":"Ascites","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"Excessive postnatal growth which may comprise increased weight, increased length, and/or increased head circumference.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001548","HPO_Synonym__c":"General overgrowth","HPO_Name__c":"Overgrowth","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"In newborns, the two frontal bones, two parietal bones, and one occipital bone are joined by fibrous sutures, which form a small posterior fontanelle, and a larger, diamond-shaped anterior fontanelle. These regions allow for the skull to pass the birth canal and for later growth. The fontanelles gradually ossify, whereby the posterior fontanelle usually closes by eight weeks and the anterior fontanelle by the 9th to 16th month of age. Large fontanelles are diagnosed if the fontanelles are larger than age-dependent norms.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000239","HPO_Synonym__c":"Enlarged fontanelles; Large fontanel; Large fontanelle; Large fontanels; Persistent wide fontanel; Wide fontanelles","HPO_Name__c":"Large fontanelles","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Seborrheic dermatitis is a form of eczema which is closely related to dandruff. It causes dry or greasy peeling of the scalp, eyebrows, and face, and sometimes trunk.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001051","HPO_Synonym__c":"Seborrhea; Seborrheic eczema","HPO_Name__c":"Seborrheic dermatitis","Feature_System__c":"Skin System; Immune System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormally short finger associated with developmental hypoplasia.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009381","HPO_Synonym__c":"Hypoplastic digits; Hypoplastic fingers; Hypoplastic/small fingers; Short finger; Stubby finger; Stubby fingers","HPO_Name__c":"Short finger","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A generalized myoclonic seizure is a type of generalized motor seizure characterized by bilateral, sudden, brief (<100 ms) involuntary single or multiple contraction of muscles or muscle groups of variable topography (axial, proximal limb, distal). Myoclonus is less regularly repetitive and less sustained than is clonus.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002123","HPO_Synonym__c":"Generalised epileptic myoclonus; Generalised myoclonic seizure; Generalized epileptic myoclonus; Generalized myoclonic seizures; Myoclonus seizures","HPO_Name__c":"Generalized myoclonic seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A duplication of the collecting system of the kidney, defined as a kidney with two (instead of, normally, one) pyelocaliceal systems. The pyelocaliceal system is comprised of the renal pelvis and calices. The duplicated renal collecting system can be associated with a single ureter or with double ureters. In the latter case, the two ureters empty separately into the bladder or fuse to form a single ureteral orifice.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000081","HPO_Synonym__c":"Double collecting system; Double urinary collecting systems on intravenous pyelography; Duplex collecting system; Duplicated renal collecting system","HPO_Name__c":"Duplicated collecting system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Tendon reflexes that are noticeably more active than usual (conventionally denoted 3+ on clinical examination). Brisk reflexes may or may not indicate a neurological lesion. They are distinguished from hyperreflexia by the fact that hyerreflexia is characterized by hyperactive repeating (clonic) reflexes, which are considered to be always abnormal.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001348","HPO_Synonym__c":"Brisk deep tendon reflexes","HPO_Name__c":"Brisk reflexes","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"The presence of a triangular form of the mouth.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000207","HPO_Synonym__c":"Triangular mouth; Triangular shaped mouth; Triangular shaped oral aperture","HPO_Name__c":"Triangular mouth","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormal accumulation of fluid beneath the skin, or in one or more cavities of the body.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000969","HPO_Synonym__c":"Dropsy; Fluid retention; Hydrops; Oedema; Water retention","HPO_Name__c":"Edema","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001399","HPO_Synonym__c":"Hepatic insufficiency; Liver failure","HPO_Name__c":"Hepatic failure","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A form of hepatic steatosis characterized by the presence of small, lipid-laden vesicles in the affected hepatocytes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001414","HPO_Synonym__c":"Microvesicular steatosis","HPO_Name__c":"Microvesicular hepatic steatosis","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A condition in which epileptiform abnormalities are believed to contribute to the progressive disturbance in cerebral function. Epileptic encephalaopathy is characterized by (1) electrographic EEG paroxysmal activity that is often aggressive, (2) seizures that are usually multiform and intractable, (3) cognitive, behavioral and neurological deficits that may be relentless, and (4) sometimes early death.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0200134","HPO_Synonym__c":"Convulsive encephalopathy","HPO_Name__c":"Epileptic encephalopathy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Gliosis is the focal proliferation of glial cells in the central nervous system.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002171","HPO_Synonym__c":"Cerebral gliosis; Excess astrocytes in brain","HPO_Name__c":"Gliosis","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The presence of a high and narrow palate.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002705","HPO_Synonym__c":"Gothic palate; High narrow palate; High vaulted palate; High, narrow palate; Narrow and high arched palate; Narrow, high-arched palate; Narrow, high-arched roof of mouth; Narrow, highly arched palate; Narrow, highly arched roof of mouth","HPO_Name__c":"High, narrow palate","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Continuous involuntary sustained muscle contraction. When an affected muscle is passively stretched, the degree of resistance remains constant regardless of the rate at which the muscle is stretched. This feature helps to distinguish rigidity from muscle spasticity.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002063","HPO_Synonym__c":"Muscle rigidity; Rigidity","HPO_Name__c":"Rigidity","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Height of the palate more than 2 SD above the mean (objective) or palatal height at the level of the first permanent molar more than twice the height of the teeth (subjective).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000218","HPO_Synonym__c":"Elevated palate; High arched palate; High palate; High, arched palate; High-arched palate; Increased palatal height; Palate high-arched; Palate, high-arched","HPO_Name__c":"High palate","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Any anomaly in the process of ocular fixation, which is the maintaining of the visual gaze on a single location.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0025404","HPO_Name__c":"Abnormal visual fixation","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Absence or underdevelopment of the corpus callosum.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007370","HPO_Synonym__c":"Absent/hypoplastic corpus callosum; Agenesis/hypoplastic corpus callosum; Complete or partial absence of the corpus callosum; Hypoplasia or absence of the corpus callosum; Hypoplastic or absent corpus callosum","HPO_Name__c":"Aplasia/Hypoplasia of the corpus callosum","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Reduced amount of myelin in the central nervous system resulting from defective myelinogenesis.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003429","HPO_Name__c":"CNS hypomyelination","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Head circumference which falls below 2 standard deviations below the mean for age and sex because of insufficient head growth after birth.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005484","HPO_Synonym__c":"Acquired microcephaly; Deceleration of head growth; Microcephaly, acquired; Microcephaly, postnatal; Postnatal deceleration of head circumference; Postnatal microcephaly","HPO_Name__c":"Secondary microcephaly","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Opisthotonus is defined as a dramatic abnormal posture due to spastic contraction of the extensor muscles of the neck, trunk, and lower extremities that produces a severe backward arching from neck to heel. In most cases, the trunk is elevated off the ground by a few inches. It is usually sudden in onset and can be sustained or repetitive. It can be considered a variant of decerebrate posturing involving a hyperextension of the neck, back, and limbs.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002179","HPO_Synonym__c":"Arc de cercle; Opisthotonos","HPO_Name__c":"Opisthotonus","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A type of tremors that is triggered by holding a limb in a fixed position.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002174","HPO_Name__c":"Postural tremor","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Atrophy (wasting, decrease in size of cells or tissue) affecting the cerebrum.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002059","HPO_Synonym__c":"Degeneration of cerebrum","HPO_Name__c":"Cerebral atrophy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An intrauterine state characterized by suboptimal values in the fetal heart rate, oxygenation of fetal blood, or other parameters indicative of compromise of the fetus. Signs of fetal distress include repetitive variable decelerations, fetal tachycardia or bradycardia, late decelerations, or low biophysical profile.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0025116","HPO_Name__c":"Fetal distress","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"An abnormality of the pigmentation of the skin.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001000","HPO_Synonym__c":"Abnormal pigmentation; Abnormal skin color; Abnormal skin pigmentation; Abnormality of pigmentation; Abnormality of skin pigmentation; Pigmentary changes; Pigmentary skin changes; Pigmentation anomaly","HPO_Name__c":"Abnormality of skin pigmentation","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Posterior positioning of the nasal root in relation to the overall facial profile for age.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005280","HPO_Synonym__c":"Depressed bridge of nose; Depressed nasal bridge; Depressed nasal root; Flat bridge of nose; Flat nasal bridge; Flat nasal root; Flat, nasal bridge; Flattened nasal bridge; Low nasal bridge; Low nasal root; Retruded bridge of nose; Retruded nasal bridge","HPO_Name__c":"Depressed nasal bridge","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Moderate intellectual disability (ID) is defined as a type of ID characterized by moderately sub-average adaptive functioning and intellectual functioning, with an intelligence quotient (IQ) the range of 35-49.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002342","HPO_Synonym__c":"Intellectual disability, moderate; IQ between 34 and 49; Mental retardation, moderate; Moderate mental deficiency; Moderate mental retardation","HPO_Name__c":"Moderate intellectual disability","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Enlargement or increased size of the heart left ventricle.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001712","HPO_Synonym__c":"Heart left ventricle hypertrophy; Left ventricular wall hypertrophy","HPO_Name__c":"Left ventricular hypertrophy","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Moderate reduction of the ability to see. On the 6m visual acuity scale, moderate reduction is defined as less than 6/18 but at least 6/60. On the 20ft visual acuity scale, moderate reduction is defined as less than 20/70 but at least 20/200. On the decimal visual acuity scale, moderate reduction is defined as less than 0.3 but at least 0.1.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0030515","HPO_Synonym__c":"Moderate reduction in visual acuity; Moderate vision loss; Moderate visual impairment; Moderate visual loss","HPO_Name__c":"Moderately reduced visual acuity","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Encephalopathy is a term that means brain disease, damage, or malfunction. In general, encephalopathy is manifested by an altered mental state.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001298","HPO_Name__c":"Encephalopathy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Infantile spasms represent a subset of \\\"epileptic spasms\\\". Infantile Spasms are epileptic spasms starting in the first year of life (infancy).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012469","HPO_Name__c":"Infantile spasms","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Absence of the septum pellucidum (meaning translucent wall in Latin - SP), also known as the ventricle of Sylvius. The septum pellucidum is a thin, triangular double membrane separating the frontal horns of the right and left lateral ventricles of the brain. It extends between the anterior portion of the corpus callosum, and the body of the fornix and its width varies from 1.5 to 3.0 mm.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001331","HPO_Synonym__c":"Absence of septum pellucidum; Absence of the septum pellucidum; Agenesis of the septum pellucidum; Missing septum pellucidum","HPO_Name__c":"Absent septum pellucidum","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Autism is a neurodevelopmental disorder characterized by impaired social interaction and communication, and by restricted and repetitive behavior. Autism begins in childhood. It is marked by the presence of markedly abnormal or impaired development in social interaction and communication and a markedly restricted repertoire of activity and interest. Manifestations of the disorder vary greatly depending on the developmental level and chronological age of the individual (DSM-IV).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000717","HPO_Synonym__c":"Autism","HPO_Name__c":"Autism","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Delayed tooth eruption, which can be defined as tooth eruption more than 2 SD beyond the mean eruption age.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000684","HPO_Synonym__c":"Delayed dental development; Delayed dental eruption; Delayed eruption; Delayed eruption of teeth; Delayed teeth eruption; Delayed tooth eruption; Eruption, delayed; Late eruption of teeth; Late tooth eruption","HPO_Name__c":"Delayed eruption of teeth","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A form of loss of vision caused by damage to the visual cortex rather than a defect in the eye.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100704","HPO_Synonym__c":"Cortical blindness; Cortical visual impairment; Cortical/cerebral visual impairment; CVI","HPO_Name__c":"Cerebral visual impairment","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A reduction in the number of circulating thrombocytes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001873","HPO_Synonym__c":"Low platelet count","HPO_Name__c":"Thrombocytopenia","Feature_System__c":"Blood and Blood-Forming Tissue","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A severe form of respiratory insufficiency characterized by inadequate gas exchange such that the levels of oxygen or carbon dioxide cannot be maintained within normal limits.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002878","HPO_Synonym__c":"Respiratory failure","HPO_Name__c":"Respiratory failure","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An anomaly of the mitochondrion, the membranous cytoplasmic organelle the interior of which is subdivided by cristae. The mitochondrion is a self replicating organelle that is the site of tissue respiration.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012103","HPO_Name__c":"Abnormality of the mitochondrion","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Lack of full passive range of motion (restrictions in flexion, extension, or other movements) of the hip joint resulting from structural changes of non-bony tissues, such as muscles, tendons, ligaments, joint capsules and/or skin.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003273","HPO_Synonym__c":"Flexion contracture of hips; Flexion contractures of hips; Hip contractures; Hip flexion contractures","HPO_Name__c":"Hip contracture","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A flexion contracture is a bent (flexed) joint that cannot be straightened actively or passively. It is thus a chronic loss of joint motion due to structural changes in muscle, tendons, ligaments, or skin that prevents normal movement of joints.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001371","HPO_Synonym__c":"Flexed joint that cannot be straightened; Flexion contractures; Flexion contractures of joints","HPO_Name__c":"Flexion contracture","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality of the face.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000271","HPO_Synonym__c":"Abnormal face; Abnormality of the face; Facial abnormality","HPO_Name__c":"Abnormality of the face","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A head tremor of moderate speed (3 to 4 Hz) in the anterior-posterior direction.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002599","HPO_Name__c":"Head titubation","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A febrile seizure is any type of seizure (most often a generalized tonic-clonic seizure) occurring with fever (at least 38 degrees Celsius) but in the absence of central nervous system infection, severe metabolic disturbance or other alternative precipitant in children between the ages of 3 months and 6 years.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002373","HPO_Synonym__c":"Febrile convulsion; Febrile seizures; Fever induced seizures; Seizures, febrile, in early childhood; Seizures, generalized, associated with fever","HPO_Name__c":"Febrile seizure (within the age range of 3 months to 6 years)","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A seizure is an intermittent abnormality of nervous system physiology characterized by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001250","HPO_Synonym__c":"Epileptic seizure; Seizures","HPO_Name__c":"Seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Status epilepticus is a type of prolonged seizure resulting either from the failure of the mechanisms responsible for seizure termination or from the initiation of mechanisms which lead to abnormally prolonged seizures (after time point t1). It is a condition that can have long-term consequences (after time point t2), including neuronal death, neuronal injury, and alteration of neuronal networks, depending on the type and duration of seizures.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002133","HPO_Synonym__c":"Prolonged seizure; Repeated seizure without recovery; Repeated seizures without recovery between them","HPO_Name__c":"Status epilepticus","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormal structure or form of the joints, i.e., one or more of the articulations where two bones join.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001367","HPO_Synonym__c":"Abnormal shape of joints; Abnormality of the joints; Anomaly of the joints","HPO_Name__c":"Abnormal joint morphology","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0040134","HPO_Synonym__c":"Abnormal liver iron concentration; Abnormal liver iron level","HPO_Name__c":"Abnormal hepatic iron concentration","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Severe distention of the kidney with dilation of the renal pelvis and calices.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000126","HPO_Name__c":"Hydronephrosis","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Distance between the medial and lateral canthi is more than 2 SD below the mean for age (objective); or, apparently reduced length of the palpebral fissures.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012745","HPO_Synonym__c":"Decreased height of palpebral fissure; Short opening between the eyelids; Short palpebral fissures","HPO_Name__c":"Short palpebral fissure","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"Spasticity (velocity-dependent increase in tonic stretch reflexes with increased muscle tone and hyperexcitable tendon reflexes) in the muscles of the lower limbs, hips, and pelvis.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002061","HPO_Synonym__c":"Lower extremities spasticity; Lower extremity spasticity; Spastic lower extremities; Spastic lower extremity; Spastic lower limb; Spastic lower limbs; Spasticity in lower extremities; Spasticity in lower extremity; Spasticity in lower limb; Spasticity in lower limbs; Spasticity of lower extremities; Spasticity of lower extremity; Spasticity of lower limb; Spasticity of lower limbs","HPO_Name__c":"Lower limb spasticity","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"Abnormally small penis. At birth, the normal penis is about 3 cm (stretched length from pubic tubercle to tip of penis) with micropenis less than 2.0-2.5 cm.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000054","HPO_Synonym__c":"Short penis; Small penis","HPO_Name__c":"Micropenis","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A structural abnormality of the macula, a region that, in a clinical context, is typically used to describe the central part of the retina within the vascular arcades.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001103","HPO_Synonym__c":"Abnormality of the macula; Macula abnormality; Macular abnormality","HPO_Name__c":"Abnormal macular morphology","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A generalized tonic seizure is a type of generalized motor seizure characterized by bilateral limb stiffening or elevation, often with neck stiffening without a subsequent clonic phase. The tonic activity can be a sustained abnormal posture, either in extension or flexion, sometimes accompanied by tremor of the extremities.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0010818","HPO_Synonym__c":"Generalised hypertonic seizure; Generalized hypertonic seizure; Generalized tonic seizures","HPO_Name__c":"Generalized tonic seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The gradual reduction in girth of the finger from proximal to distal.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001182","HPO_Synonym__c":"Distally tapering fingers; Tapered finger; Tapered fingertips; Tapering fingers","HPO_Name__c":"Tapered finger","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Retinal dystrophy is an abnormality of the retina associated with a hereditary process. Retinal dystrophies are defined by their predominantly monogenic inheritance and they are frequently associated with loss or dysfunction of photoreceptor cells as a primary or secondary event.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000556","HPO_Synonym__c":"Breakdown of light-sensitive cells in back of eye","HPO_Name__c":"Retinal dystrophy","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An anomaly of the supraorbital portion of the frontal bones.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100538","HPO_Synonym__c":"Abnormality of the brow of the face","HPO_Name__c":"Abnormality of the supraorbital ridges","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Interpupillary distance more than 2 SD above the mean (alternatively, the appearance of an increased interpupillary distance or widely spaced eyes).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000316","HPO_Synonym__c":"Excessive orbital separation; Increased distance between eye sockets; Increased distance between eyes; Increased interpupillary distance; Ocular hypertelorism; Wide-set eyes; Widely spaced eyes; Widened interpupillary distance","HPO_Name__c":"Hypertelorism","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality of skull shape characterized by a decreased anterior-posterior diameter. That is, a cephalic index greater than 81%. Alternatively, an apparently shortened anteroposterior dimension (length) of the head compared to width.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000248","HPO_Synonym__c":"Short and broad skull","HPO_Name__c":"Brachycephaly","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The presence of skeletal muscular atrophy (which is also known as amyotrophy).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003202","HPO_Synonym__c":"Amyotrophy; Amyotrophy involving the extremities; Muscle atrophy; Muscle atrophy, neurogenic; Muscle degeneration; Muscle hypotrophy; Muscle wasting; Muscular atrophy; Neurogenic muscle atrophy; Neurogenic muscle atrophy, especially in the lower limbs; Neurogenic muscular atrophy","HPO_Name__c":"Skeletal muscle atrophy","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An increase in size of the anatomic space between the arachnoid membrane and pia mater.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012704","HPO_Synonym__c":"Enlarged subarachnoid space","HPO_Name__c":"Widened subarachnoid space","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Generalized (diffuse, unlocalized) amyotrophy (muscle atrophy) affecting multiple muscles.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003700","HPO_Synonym__c":"Diffuse amyotrophy; Diffuse muscle atrophy; Diffuse muscle wasting; Diffuse skeletal muscle wasting; Generalized muscle atrophy; Generalized muscle degeneration; Muscle atrophy, diffuse; Muscle atrophy, generalized; Muscular atrophy, generalized","HPO_Name__c":"Generalized amyotrophy","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Decreased size of the teeth, which can be defined as a mesiodistal tooth diameter (width) more than 2 SD below mean. Alternatively, an apparently decreased maximum width of tooth.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000691","HPO_Synonym__c":"Decreased size of tooth; Decreased width of tooth; Small teeth; Small tooth; Tooth hypoplasia; Tooth hypotrophy; Underdeveloped tooth","HPO_Name__c":"Microdontia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality of refraction characterized by the ability to see objects nearby clearly, while objects in the distance appear blurry.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000545","HPO_Synonym__c":"Close sighted; Near sighted; Near sightedness; Nearsightedness","HPO_Name__c":"Myopia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Upturning of the big toe (and sometimes fanning of the other toes) in response to stimulation of the sole of the foot. If the Babinski sign is present it can indicate damage to the corticospinal tract.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003487","HPO_Synonym__c":"Extensor plantar reflexes; Extensor plantar response; Extensor plantar responses; Positive Babinski sign","HPO_Name__c":"Babinski sign","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormal increased size of the spleen.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001744","HPO_Synonym__c":"Increased spleen size; Large spleen","HPO_Name__c":"Splenomegaly","Feature_System__c":"Cardiovascular System; Immune System; Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An elbow contracture that limits the ability of the elbow joint to be extended (straightened), meaning that the elbow is fixed in an flexed (bent) position.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002987","HPO_Synonym__c":"Elbow flexion contractures; Elbow flexion deformity; Fixed flexion at the elbow joint","HPO_Name__c":"Elbow flexion contracture","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle). Even when relaxed, muscles have a continuous and passive partial contraction which provides some resistance to passive stretching. Hypotonia thus manifests as diminished resistance to passive stretching. Hypotonia is not the same as muscle weakness, although the two conditions can co-exist.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001252","HPO_Synonym__c":"Low muscle tone; Low or weak muscle tone; Muscle hypotonia; Muscular hypotonia","HPO_Name__c":"Hypotonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The presence of an abnormal lateral curvature of the spine.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002650","HPO_Name__c":"Scoliosis","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Atrial septal defect (ASD) is a congenital abnormality of the interatrial septum that enables blood flow between the left and right atria via the interatrial septum.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001631","HPO_Synonym__c":"An opening in the wall separating the top two chambers of the heart; ASD; Atria septal defect; Atrial septum defect; Atrioseptal defect; Defect in the atrial septum; Hole in heart wall separating two upper heart chambers","HPO_Name__c":"Atrial septal defect","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The presence of erythrocytes with a mouth-shaped (stoma) area of central pallor on peripheral blood smear.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004446","HPO_Synonym__c":"erythrocyte stomatocytes; Red cell stomatocytosis","HPO_Name__c":"Stomatocytosis","Feature_System__c":"Blood and Blood-Forming Tissue","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"An increased level of iron in liver tissues.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012465","HPO_Synonym__c":"Increased iron concentration in liver; Increased liver iron level","HPO_Name__c":"Elevated hepatic iron concentration","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A profound delay in the achievement of motor or mental milestones in the domains of development of a child.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012736","HPO_Synonym__c":"Global developmental delay, profound","HPO_Name__c":"Profound global developmental delay","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality of the glabella.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002056","HPO_Synonym__c":"Abnormality of the area between the eyebrows; Glabellar abnormality","HPO_Name__c":"Abnormality of the glabella","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Focal seizure with eyelid myoclonia, not eyelid myoclonias in the context of absence seizures.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011168","HPO_Synonym__c":"Eyelid myoclonias","HPO_Name__c":"Focal seizure with eyelid myoclonia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormally increased muscular tone that causes fixed abnormal postures. There is a slow, intermittent twisting motion that leads to exaggerated turning and posture of the extremities and trunk.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001332","HPO_Synonym__c":"Dystonic movements","HPO_Name__c":"Dystonia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormally increased serum levels of alkaline phosphatase activity.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003155","HPO_Synonym__c":"Elevated alkaline phosphatase; Elevated ALP; Greatly elevated alkaline phosphatase; High serum alkaline phosphatase; Hyperphosphatasemia; Hyperphosphatasia; Increased alkaline phosphatase; Increased serum alkaline phosphatase","HPO_Name__c":"Elevated circulating alkaline phosphatase concentration","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Underdevelopment of the malar prominence of the jugal bone (zygomatic bone in mammals), appreciated in profile, frontal view, and/or by palpation.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000272","HPO_Synonym__c":"Decreased size of malar bone; Depressed malar region; Flat cheekbone; Malar hypoplasia; Underdevelopment of malar bone; Zygomatic flattening","HPO_Name__c":"Malar flattening","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001341","HPO_Synonym__c":"Olfactory lobe absence","HPO_Name__c":"Olfactory lobe agenesis","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Increased concentration of ferritin in the blood circulation.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003281","HPO_Synonym__c":"Elevated serum ferritin; High ferritin level; Hyperferritinaemia; Hyperferritinemia; Increased ferritin; Increased plasma ferritin; Increased serum ferritin level","HPO_Name__c":"Increased circulating ferritin concentration","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"An abnormally increased head circumference in a growing child. Head circumference is measured with a nonelastic tape and comprises the distance from above the eyebrows and ears and around the back of the head. The measured HC is then plotted on an appropriate growth chart.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0040194","HPO_Synonym__c":"Increased head circumference","HPO_Name__c":"Increased head circumference","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A nail that is diminished in length and width, i.e., underdeveloped nail.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001792","HPO_Synonym__c":"Hypoplastic nail; Hypoplastic nails; Nail hypoplasia; Small nail; Small nails","HPO_Name__c":"Small nail","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Cerebellar hypoplasia is a descriptive term implying a cerebellum with a reduced volume, but a normal shape and is stable over time.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001321","HPO_Synonym__c":"Congenital cerebellar hypoplasia; Hypoplasia of cerebellum; Hypoplastic cerebellum; Small cerebellum; Underdeveloped cerebellum","HPO_Name__c":"Cerebellar hypoplasia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004308","HPO_Synonym__c":"Ventricular arrhythmias","HPO_Name__c":"Ventricular arrhythmia","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A generalized-onset seizure is a type of seizure originating at some point within, and rapidly engaging, bilaterally distributed networks. The networks may include cortical and subcortical structures but not necessarily the entire cortex.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002197","HPO_Synonym__c":"Generalized onset seizure; Generalized seizures; Generalized-onset seizures; Primary generalized seizure","HPO_Name__c":"Generalized-onset seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An exaggerated startle reaction in response to a sudden unexpected visual or acoustic stimulus, or a quick movement near the face.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002267","HPO_Synonym__c":"Exaggerated acoustic startle response; Increased startle response","HPO_Name__c":"Exaggerated startle response","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A focal clonic seizure is a type of focal motor seizure characterized by sustained rhythmic jerking, that is regularly repetitive.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002266","HPO_Synonym__c":"Focal clonic seizures; Localized clonic seizure; Partial clonic seizure; Segmental clonic seizure","HPO_Name__c":"Focal clonic seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A congenital defect characterized by the absence of one or more permanent teeth, including oligodontia, hypodontia, and adontia of the of permanent teeth.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006349","HPO_Synonym__c":"Absence of adult teeth; Absence of permanent teeth; Absence of secondary dentition; Absent permanent teeth; Agenesis of permanent dentition; Agenesis of secondary dentition; Failure of development of permanent teeth; Failure of development of secondary teeth; Missing permanent teeth; No permanent dentition","HPO_Name__c":"Agenesis of permanent teeth","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormal thinning of the cortical region of bones.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002753","HPO_Synonym__c":"Thin cortices","HPO_Name__c":"Thin bony cortex","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Increased width of the alveolar ridges.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009085","HPO_Synonym__c":"Alveolar ridge excess; Enlarged alveolar ridge; Hyperplasia of alveolar process of jaw; Hyperplasia of alveolar ridge; Increased size of alveolar ridge; Overgrowth of alveolar ridge; Overgrowth of gum ridge; Thick alveolar ridges; Thickened alveolar ridges","HPO_Name__c":"Alveolar ridge overgrowth","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A pale yellow discoloration of the optic disc (the area of the optic nerve head in the retina). The optic disc normally has a pinkish hue with a central yellowish depression.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000543","HPO_Synonym__c":"Pale optic disc","HPO_Name__c":"Optic disc pallor","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A circumscribed, solid elevation of skin with no visible fluid, varying in size from a pinhead to less than 10mm in diameter at the widest point.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0200034","HPO_Synonym__c":"Papules","HPO_Name__c":"Papule","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Inspiration of a foreign object into the airway.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002835","HPO_Name__c":"Aspiration","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The concentration of iron in the blood circulation is outside the limits of normal.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0040130","HPO_Synonym__c":"Abnormal serum iron concentration","HPO_Name__c":"Abnormal circulating iron concentration","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Truncal ataxia is a sign of ataxia characterized by instability of the trunk. It usually occurs during sitting.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002078","HPO_Synonym__c":"Instability or lack of coordination of central trunk muscles; Trunk ataxia","HPO_Name__c":"Truncal ataxia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001263","HPO_Synonym__c":"Delayed cognitive development; Delayed development; Delayed developmental milestones; Delayed intellectual development; Delayed milestones; Delayed psychomotor development; Developmental delay; Developmental delay in early childhood; Developmental delay, global; Developmental retardation; GDD; Lack of psychomotor development; Motor and developmental delay; Motormental retardation; Psychomotor delay; Psychomotor development deficiency; Psychomotor development failure; Psychomotor developmental delay; Retarded development; Retarded mental development; Retarded psychomotor development","HPO_Name__c":"Global developmental delay","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008936","HPO_Synonym__c":"Low muscle tone in trunk; Muscular hypotonia of the trunk; Truncal hypotonia","HPO_Name__c":"Axial hypotonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Reduced convexity of the occiput (posterior part of skull).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005469","HPO_Synonym__c":"Flat posterior cranium; Posterior flattening of the skull","HPO_Name__c":"Flat occiput","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A morphological abnormality of the mouth in which the angle of the mouth is downturned. The oral commissures are positioned inferior to the midline labial fissure.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002714","HPO_Synonym__c":"Downturned corners of mouth; Downturned corners of the mouth; Downturned mouth; Downturned oral commisures","HPO_Name__c":"Downturned corners of mouth","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Distance between the commissures of the mouth more than 2 SD below the mean. Alternatively, an apparently decreased width of the oral aperture (subjective).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000160","HPO_Synonym__c":"Microstomia; Narrow mouth; Small mouth; Small oral aperture","HPO_Name__c":"Narrow mouth","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006986","HPO_Synonym__c":"Spastic upper extremities; Spastic upper extremity; Spastic upper limb; Spastic upper limbs; Spasticity in upper extremities; Spasticity in upper extremity; Spasticity in upper limb; Spasticity in upper limbs; Spasticity of upper extremities; Spasticity of upper extremity; Spasticity of upper limb; Spasticity of upper limbs; Uncontrollable movement in upper arms; Upper extremities spasticity; Upper extremity spasticity","HPO_Name__c":"Upper limb spasticity","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Absence of fine and sharp appearance of brows, nose, lips, mouth, and chin, usually because of rounded and heavy features or thickened skin with or without thickening of subcutaneous and bony tissues.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000280","HPO_Synonym__c":"Coarse face; Coarse facial appearance; Coarse facial features; Coarse facies","HPO_Name__c":"Coarse facial features","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A chronic disorder of the liver in which liver tissue becomes scarred and is partially replaced by regenerative nodules and fibrotic tissue resulting in loss of liver function.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001394","HPO_Synonym__c":"Hepatic cirrhosis; Scar tissue replaces healthy tissue in the liver","HPO_Name__c":"Cirrhosis","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormal (retrograde) movement of urine from the bladder into ureters or kidneys related to inadequacy of the valvular mechanism at the ureterovesicular junction or other causes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000076","HPO_Synonym__c":"Ureteral reflux; Ureteric reflux; Vesico-ureteral reflux; Vesicoureteric reflux; VUR","HPO_Name__c":"Vesicoureteral reflux","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An acute episode of pneumonia due to the aspiration (breathing in) of food, liquid, or gastric contents into the upper respiratory tract.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011952","HPO_Name__c":"Acute aspiration pneumonia","Feature_System__c":"Respiratory system; Immune System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A condition in which the helix is folded over to a greater degree than normal. That is, excessive curling of the helix edge, whereby the free edge is parallel to the plane of the ear.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000396","HPO_Synonym__c":"Over-folded helices; Overfolded ears; Overfolded helices","HPO_Name__c":"Overfolded helix","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A type of Developmental delay characterized by a delay in acquiring motor skills.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001270","HPO_Synonym__c":"Delay in development of motor milestones; Delay in motor development; Delayed development of motor milestones; Delayed early motor milestones; Delayed motor development; Delayed motor milestones; Locomotor delay; Motor developmental delay; Motor developmental milestones not achieved; Motor retardation; Retarded motor development; Slow development of motor milestones","HPO_Name__c":"Motor delay","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality of the cerebral white matter.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002500","HPO_Synonym__c":"Abnormality of subcortical white matter; Abnormality of the cerebral white matter; Cerebral white matter abnormalities; Leukoaraiosis; White matter abnormalities; White matter alterations","HPO_Name__c":"Abnormal cerebral white matter morphology","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality in voluntary or involuntary eye movements or their control.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000496","HPO_Synonym__c":"Abnormal extraocular movement; Abnormal extraocular movements; Abnormal eye motility; Abnormal eye movement; Abnormal eye movements; Abnormal motility of the globe of the eye; Abnormal movement of the globe of the eye; Abnormal ocular movements; Abnormality of eye movement; Eye movement abnormalities; Eye movement issue; Ocular movement abnormalities; Oculomotor abnormalities","HPO_Name__c":"Abnormality of eye movement","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"Developmental hypoplasia of the mandible.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000347","HPO_Synonym__c":"Decreased size of lower jaw; Decreased size of mandible; Hypoplasia of lower jaw; Hypoplasia of mandible; Hypoplastic mandible; Hypoplastic mandible condyle; Hypotrophic lower jaw; Hypotrophic mandible; Little lower jaw; Little mandible; Lower jaw deficiency; Lower jaw hypoplasia; Mandibular deficiency; Mandibular hypoplasia; Mandibular micrognathia; Micrognathia of lower jaw; Micromandible; Robin mandible; Severe hypoplasia of mandible; Small jaw; Small lower jaw; Small mandible; Underdevelopment of lower jaw; Underdevelopment of mandible","HPO_Name__c":"Micrognathia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Loss of developmental skills, as manifested by loss of developmental milestones.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002376","HPO_Synonym__c":"Loss of acquired milestones; Loss of developmental milestones; Loss of milestones; Mental deterioration in childhood; Neurodevelopmental regression; Psychomotor regression; Psychomotor regression beginning in infancy; Psychomotor regression in infants; Psychomotor regression, progressive","HPO_Name__c":"Developmental regression","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A bilateral tonic-clonic seizure is a seizure defined by a tonic (bilateral increased tone, lasting seconds to minutes) and then a clonic (bilateral sustained rhythmic jerking) phase.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002069","HPO_Synonym__c":"Bilateral convulsive seizures; Generalised tonic-clonic seizure (without specification of onset); Generalized convulsion; Generalized tonic-clonic seizure (without specification of onset); Grand mal; Grand mal seizures; Seizures, tonic-clonic; Tonic-clonic convulsion; Tonic-clonic convulsions","HPO_Name__c":"Bilateral tonic-clonic seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A contracture (chronic loss of joint motion due to structural changes in muscle, tendons, ligaments, or skin) that prevent normal movement of one or more joints of the limbs.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003121","HPO_Synonym__c":"Limb contractures","HPO_Name__c":"Limb joint contracture","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormal difference between the left and right sides of the face.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000324","HPO_Synonym__c":"Asymmetric facies; Asymmetry of face; Asymmetry of right and left side of face; Crooked face; Facial asymmetry; Unsymmetrical face","HPO_Name__c":"Facial asymmetry","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Anteriorly-facing nostrils viewed with the head in the Frankfurt horizontal and the eyes of the observer level with the eyes of the subject. This gives the appearance of an upturned nose (upturned nasal tip).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000463","HPO_Synonym__c":"Anteverted nose; Anteverted nostrils; Nasal tip, upturned; Nostrils anteverted; Upturned nares; Upturned nasal tip; Upturned nose; Upturned nostrils","HPO_Name__c":"Anteverted nares","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormal orientation of the earlobes such that they point out- and upward. That is, the lateral surface of ear lobe faces superiorly.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009909","HPO_Synonym__c":"Fleshy upturned lobules; Lobe, uplifted; Uplifted earlobe; Upturned earlobe","HPO_Name__c":"Uplifted earlobe","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006956","HPO_Synonym__c":"Dilatation of lateral cerebral ventricles; Dilation of lateral ventricles; Enlarged lateral ventricles; Lateral ventricle dilatation","HPO_Name__c":"Lateral ventricle dilatation","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes with increased muscle tone, exaggerated (hyperexcitable) tendon reflexes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001257","HPO_Synonym__c":"Involuntary muscle stiffness, contraction, or spasm; Muscle spasticity; Muscular spasticity","HPO_Name__c":"Spasticity","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Pneumonia due to the aspiration (breathing in) of food, liquid, or gastric contents into the upper respiratory tract.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011951","HPO_Name__c":"Aspiration pneumonia","Feature_System__c":"Respiratory system; Immune System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A thickening of the skin thickness in the posterior aspect of the fetal neck. A nuchal fold (NF) measurement is obtained in a transverse section of the fetal head at the level of the cavum septum pellucidum and thalami, angled posteriorly to include the cerebellum. The measurement is taken from the outer edge of the occiput bone to the outer skin limit directly in the midline. An NF measurement greater than 5 mm at 14 to 17+6 weeks of gestation, or 6 mm at 18 to 28 weeks has been associated with a markedly increased risk for Down syndrome.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000474","HPO_Synonym__c":"Excess nuchal skin; Increased nuchal fold; Increased nuchal fold thickness; Thick nuchal fold; Thickened nuchal skin; Thickened skin folds of neck; Thickened skin over the neck","HPO_Name__c":"Thickened nuchal skin fold","HPO_Feature_Type__c":"Imaging_Ultrasound_Fetal"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Paralysis of all four limbs, and trunk of the body below the level of an associated injury to the spinal cord. The etiology of quadriplegia is similar to that of paraplegia except that the lesion is in the cervical spinal cord rather than in the thoracic or lumbar segments of the spinal cord.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002445","HPO_Synonym__c":"Paralysis of all four limbs; Quadriplegia","HPO_Name__c":"Tetraplegia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Hyperplasia of the gingiva (that is, a thickening of the soft tissue overlying the alveolar ridge. The degree of thickening ranges from involvement of the interdental papillae alone to gingival overgrowth covering the entire tooth crown.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000212","HPO_Synonym__c":"Gingival enlargement; Gingival hyperplasia; Gum enlargement; Gum hypertrophy; Hypertrophic gingivitis","HPO_Name__c":"Gingival overgrowth","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormally pale skin.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000980","HPO_Name__c":"Pallor","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Lack of breathing with no movement of the respiratory muscles and no exchange of air in the lungs. This term refers to a disposition to have recurrent episodes of apnea rather than to a single event.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002104","HPO_Synonym__c":"Absence of spontaneous respiration; Apneic episodes; Apnoea","HPO_Name__c":"Apnea","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A position of the fetus at delivery in which the fetus enters the birth canal with the buttocks or feet first.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001623","HPO_Synonym__c":"Breech presentation at birth; Feet or buttocks of fetus positioned near opening of uterus","HPO_Name__c":"Breech presentation","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Underdevelopment of the corpus callosum.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002079","HPO_Synonym__c":"Corpus callosum hypoplasia; Hypoplasia of corpus callosum; Hypoplastic corpus callosum; Underdevelopment of part of brain called corpus callosum","HPO_Name__c":"Hypoplasia of the corpus callosum","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The term large for gestational age applies to babies whose birth weight lies above the 90th percentile for that gestational age.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001520","HPO_Synonym__c":"Birth weight > 90th percentile; Birthweight > 90th percentile; Fetal macrosomia; Macrosomia; Macrosomia, neonatal","HPO_Name__c":"Large for gestational age","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Complete lack of development of speech and language abilities.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001344","HPO_Synonym__c":"Absent speech development; Lack of language development; Lack of speech; No speech development; No speech or language development; Nonverbal","HPO_Name__c":"Absent speech","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The palpebral fissure inclination is more than two standard deviations above the mean for age (objective); or, the inclination of the palpebral fissure is greater than typical for age.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000582","HPO_Synonym__c":"Mongoloid slant; Upslanting palpebral fissures; Upward slanted palpebral fissures; Upward slanting of palpebral fissures; Upward slanting of the opening between the eyelids; Upward slanting palpebral fissures","HPO_Name__c":"Upslanted palpebral fissure","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Pierre Robin malformation is a sequence of developmental malformations characterized by micrognathia (mandibular hypoplasia), glossoptosis and cleft palate.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000201","HPO_Synonym__c":"Pierre Robin sequence; Pierre-robin anomaly; Pierre-robin deformity; Pierre-robin malformation; Robin sequence","HPO_Name__c":"Pierre-Robin sequence","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality of the philtrum.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000288","HPO_Synonym__c":"Abnormal philtrum; Abnormality of the infranasal depression; Abnormality of the paralabial region","HPO_Name__c":"Abnormality of the philtrum","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003517","HPO_Synonym__c":"Fetal overgrowth","HPO_Name__c":"Birth length greater than 97th percentile","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005257","HPO_Synonym__c":"Small chest; Small thorax","HPO_Name__c":"Thoracic hypoplasia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An increase in size of the ventricular system of the brain.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002119","HPO_Synonym__c":"Cerebral ventricular dilatation; Dilated cerebral ventricle; Dilated cerebral ventricles; Dilated ventricles; Enlarged cerebral ventricles; Enlarged ventricles; Enlarged ventricular system; Large cerebral ventricles and cisternae; Ventricular dilatation","HPO_Name__c":"Ventriculomegaly","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Incapability to ambulate.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002540","HPO_Synonym__c":"Inability to walk; Non-ambulatory","HPO_Name__c":"Inability to walk","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Difficulty to maintain correct position of the head while standing or sitting. Infant head lag is observed when the head seems to flop around or lags posteriorly behind the trunk. Several articles have maintained that head lag should be absent by age 3 to 4 months.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002421","HPO_Synonym__c":"Delay in head control; Delay in head righting; Infant head lag; Poor head control","HPO_Name__c":"Poor head control","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormal echotexture visible in liver ultrasound manifesting as a diffuse hyperechoic liver echotexture with multiple, small hypoechoic lesions. The appearance is said to resemble a starry sky (multiple white spots on a dark background).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0031145","HPO_Name__c":"Starry sky appearance on hepatic sonography","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The absence of all teeth from the normal series by a failure to develop.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000674","HPO_Synonym__c":"Anodontia vera; Complete agenesis of all teeth; Complete dental agenesis; Failure of development of all teeth","HPO_Name__c":"Anodontia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A type of cirrhosis characterized by the presence of small regenerative nodules.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001413","HPO_Name__c":"Micronodular cirrhosis","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"A structural abnormality of the pons.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007361","HPO_Synonym__c":"Abnormality of the pons","HPO_Name__c":"Abnormal pons morphology","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Increased convexity of the occiput (posterior part of the skull).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000269","HPO_Synonym__c":"Prominent back of the skull; Prominent posterior cranium; Prominent posterior skull; Protruding occiput","HPO_Name__c":"Prominent occiput","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The burst suppression pattern in electroencephalography refers to a characteristic periodic pattern of low voltage (<10 microvolts) suppressed background and a relatively shorter pattern of higher amplitude slow, sharp, and spiking complexes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0010851","HPO_Name__c":"EEG with burst suppression","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Hypsarrhythmia is abnormal interictal high amplitude waves and a background of irregular spikes. There is continuous (during wakefulness), high-amplitude (>200 Hz), generalized polymorphic slowing with no organized background and multifocal spikes demonstrated by electroencephalography (EEG).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002521","HPO_Synonym__c":"Hypsarrhythmia by EEG","HPO_Name__c":"Hypsarrhythmia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Head circumference below 2 standard deviations below the mean for age and sex.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000252","HPO_Synonym__c":"Abnormally small cranium; Abnormally small skull; Decreased circumference of cranium; Decreased size of cranium; Decreased size of skull; Reduced head circumference; small cranium; Small head circumference","HPO_Name__c":"Microcephaly","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001488","HPO_Synonym__c":"Drooping of both upper eyelids","HPO_Name__c":"Bilateral ptosis","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","Feature__r":{"HPO_Description__c":"Delayed myelination.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012448","HPO_Name__c":"Delayed myelination","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Very brief, involuntary random muscular contractions occurring at rest, in response to sensory stimuli, or accompanying voluntary movements.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001336","HPO_Synonym__c":"Myoclonic jerks","HPO_Name__c":"Myoclonus","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Asymmetric head shape, which is usually a combination of unilateral occipital flattening with ipsilateral frontal prominence, leading to rhomboid cranial shape.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001357","HPO_Synonym__c":"Flat head syndrome; Flattening of cranial vault; Flattening of cranium; Flattening of skull; Rhomboid shaped cranium; Rhomboid shaped skull","HPO_Name__c":"Plagiocephaly","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"In this case the right ventricle is more muscular than normal, causing a characteristic boot-shaped (coeur-en-sabot) appearance as seen on anterior- posterior chest x-rays. Right ventricular hypertrophy is commonly associated with any form of right ventricular outflow obstruction or pulmonary hypertension, which may in turn owe its origin to left-sided disease. The echocardiographic signs are thickening of the anterior right ventricular wall and the septum. Cavity size is usually normal, or slightly enlarged. In many cases there is associated volume overload present due to tricuspid regurgitation, in the absence of this, septal motion is normal.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001667","HPO_Synonym__c":"Heart right ventricle hypertrophy","HPO_Name__c":"Right ventricular hypertrophy","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A type of primitive reflex that can be elicated when the hand of the examiner is gently inserted into the palm of the patient's hand. The palmar surface is stroked or simply touched. The flexor surfaces of the fingers may be stimulated also by the examiner's fingers. The stimulus should be in a distal direction. With a positive response, the patient grasps the examiner's hand with variable strength and continues to grasp as the examiner's hand is moved. Ability to release the grip voluntarily depends on the activity of the reflex; some patients can do so readily, while others can even be lifted off the bed, since the grasp has such power [NCBI Books:NBK395].","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0030903","HPO_Synonym__c":"Palmar grasp reflex","HPO_Name__c":"Grasp reflex","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Increased spaces (diastemata) between most of the teeth in the same dental arch.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000687","HPO_Synonym__c":"Generalized dental spacing; Generalized spacing of teeth; Multiple diastemata; Wide-spaced teeth; Widely spaced teeth; Widely-spaced teeth","HPO_Name__c":"Widely spaced teeth","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Premature fusion of the metopic suture.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011330","HPO_Synonym__c":"Metopic craniosynostosis; Metopic suture craniosynostosis","HPO_Name__c":"Metopic synostosis","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abrupt loss of heart function.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001695","HPO_Synonym__c":"Heart stops beating","HPO_Name__c":"Cardiac arrest","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Excessively deep creases of the palm.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006191","HPO_Synonym__c":"Deep palm line; Deep palmar creases","HPO_Name__c":"Deep palmar crease","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Upward and/or sideward growth of anterior hair.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002236","HPO_Synonym__c":"Cowlick; Frontal Cowlick; Frontal upsweep of hair; Upswept frontal hair","HPO_Name__c":"Frontal upsweep of hair","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007190","HPO_Name__c":"Neuronal loss in the cerebral cortex","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002529","HPO_Synonym__c":"Loss of brain cells; Neuronal loss; Neuronal loss in CNS","HPO_Name__c":"Neuronal loss in central nervous system","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Atrophy of the cortex of the cerebrum.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002120","HPO_Synonym__c":"Cerebral cortex atrophy; Cortical atrophy; Decrease in size of the outer layer of the brain due to loss of brain cells","HPO_Name__c":"Cerebral cortical atrophy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300868","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The facial appearance is more circular than usual as viewed from the front.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000311","HPO_Synonym__c":"Circular face; Round face; Round facial appearance; Round facial shape; Round facies","HPO_Name__c":"Round face","HPO_Feature_Type__c":"Symptom"}}],"tags":{"Cause":["Genetics","Inborn Errors of Metabolism"],"Disease Category":["Genetics","Neurology","Inborn Errors of Metabolism","Congenital Abnormality"],"Specialist":["Genetics","Neurology","Epilepsy","Neurodevelopmental disabilities","Pediatrics"],"Account":["Epilepsy"]},"synonyms":["dee20"," developmental and epileptic encephalopathy 20"," epileptic encephalopathy, early infantile, 20"," glycosylphosphatidylinositol biosynthesis defect 4"," gpibd4"," mcahs type 2"," mcahs2"," multiple congenital anomalies-hypotonia-seizures syndrome 2, x-linked recessive"," multiple congenital anomalies-hypotonia-seizures syndrome type 2"," multiple congenital anomalies/dysmorphic syndrome-intellectual disability caused by mutation in piga"," piga multiple congenital anomalies/dysmorphic syndrome-intellectual disability"]}