{"Name":"Severe X-linked intellectual disability, Gustavson type","DiseaseID__c":"GARD:0005611","id":5611,"encodedName":"severe-x-linked-intellectual-disability-gustavson-type","IsDeleted":false,"Disease_Name_Full__c":"Severe X-linked intellectual disability, Gustavson type","Xref_IDs__c":"722213009; C0795965; C536759; DOID:0081123; MEDGEN:167088; MONDO:0010661; OMIM:309555; ORPHA:3078","USA_Estimate__c":"1,000","No_of_Specialist_Tagsa__c":6,"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":3,"Disease_Characteristics_Score__c":6,"No_of_Age_at_Onset__c":2,"Description_Source__c":"MONDO:0010661","Disease_Description__c":"A rare, genetic, X-linked syndromic intellectual disability disorder characterized by severe intellectual disability, microcephaly, post-natal growth retardation, severe visual impairment or blindness (due to optic atrophy), severe hearing defect, spasticity, epileptic seizures, restricted large-joint movements and early death (in infancy or early childhood). Facial dysmorphic features (large dysplastic ears and short broad nose) are additionally observed. There have been no further descriptions in the literature since 1993.","GARD_Name__c":"Severe X-linked intellectual disability, Gustavson type","GARD_Synonym__c":"gustavson syndrome; intellectual developmental disorder with optic atrophy, deafness, and seizures; mrxsg","Curated_Disease_Description_Source__c":"MONDO:0010661","Curated_Disease_Description__c":"A rare, genetic, X-linked syndromic intellectual disability disorder characterized by severe intellectual disability, microcephaly, post-natal growth retardation, severe visual impairment or blindness (due to optic atrophy), severe hearing defect, spasticity, epileptic seizures, restricted large-joint movements and early death (in infancy or early childhood). Facial dysmorphic features (large dysplastic ears and short broad nose) are additionally observed. There have been no further descriptions in the literature since 1993.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"1,000","Age_at_Onset_Snippet_Text__c":"as a Newborn and as an Infant","SourceID__c":"ORPHA:3078","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0010661","ORPHANET_ID__c":"ORPHA:3078","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Discapacidad intelectual grave ligada al cromosoma x tipo gustavson","Spanish_Description_Source__c":"ORPHA:3078","Spanish_Description__c":"Es una discapacidad intelectual sindrómica ligada al cromosoma X, de origen genético y poco frecuente, caracterizada por discapacidad intelectual grave, microcefalia, retraso del crecimiento post-natal, disfunción visual grave o ceguera (por atrofia óptica), grave deterioro auditivo, espasticidad, crisis epilépticas, movilidad restringida en las grandes articulaciones y muerte prematura (en la lactancia o en la infancia temprana). También se observan rasgos faciales dismórficos (orejas grandes displásicas y nariz ancha y corta). No ha habido más casos descritos en la literatura desde 1993.","Spanish_Disease_Name__c":"discapacidad intelectual grave ligada al cromosoma x tipo gustavson","Spanish_GARD_Synonym__c":null,"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":"A rare, genetic, X-linked syndromic intellectual disability disorder characterized by severe intellectual disability, microcephaly, post-natal growth retardation, severe visual impairment or blindness (due to optic atrophy), severe hearing defect, spasticity, epileptic seizures, restricted large-joint movements and early death (in infancy or early childhood). Facial dysmorphic features (large dysplastic ears and short broad nose) are additionally observed. There have been no further descriptions in the literature since 1993.","Curated_Disease_Description_Source__c":"MONDO:0010661","GARD_Synonym__c":"gustavson syndrome; intellectual developmental disorder with optic atrophy, deafness, and seizures; mrxsg","Name":"Severe X-linked intellectual disability, Gustavson type","Curated_USA_Estimate__c":"1,000","estimateUsa":"1,000"}],"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":"Ophthalmology","Tag_Category__c":"Specialist"},{"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":"Neuro-Ophthalmology","Tag_Category__c":"Specialist","curated_tag_name":"Neuro-ophthalmic diseases"},{"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:3078"},{"Age_At_Onset__c":"Neonatal","Provided_By__c":"ORPHA:3078"}],"External_Identifier_Disease__c":[{"URL__c":"https://www.orpha.net/en/disease/detail/3078","Source__c":"C0795965; MONDO:0010661","Xref__c":"ORPHA:3078"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=722213009","Source__c":"MONDO:0010661","Xref__c":"722213009"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C0795965","Source__c":"C0795965","Xref__c":"C0795965"},{"URL__c":"https://www.omim.org/entry/309555","Source__c":"C0795965; MONDO:0010661; ORPHA:3078","Xref__c":"OMIM:309555"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=167088","Source__c":"C0795965","Xref__c":"MEDGEN:167088"},{"URL__c":"https://www.ncbi.nlm.nih.gov/mesh/C536759","Source__c":"MONDO:0010661","Xref__c":"C536759"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A0081123","Source__c":"MONDO:0010661","Xref__c":"DOID:0081123"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0010661","Source__c":"GARD:0005611","Xref__c":"MONDO:0010661"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"RBMX","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["X-linked"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Distance from nasion to subnasale more than two standard deviations below the mean, or alternatively, an apparently decreased length from the nasal root to the nasal tip.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003196","HPO_Synonym__c":"Decreased length of nose; Hypoplastic nose; Nasal hypoplasia; Short nose; Shortened nose","HPO_Name__c":"Short nose","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A profound (essentially complete) form of hearing impairment.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012715","HPO_Synonym__c":"Profound hearing impairment","HPO_Name__c":"Profound hearing impairment","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"The presence of both a prominent heel and a convex contour of the sole.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001838","HPO_Synonym__c":"Congenital vertical talus; Rocker bottom feet; Rocker bottom foot; Rocker-bottom feet; Rockerbottom feet","HPO_Name__c":"Rocker bottom foot","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A hole between the two bottom chambers (ventricles) of the heart. The defect is centered around the most superior aspect of the ventricular septum.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001629","HPO_Synonym__c":"Hole in heart wall separating two lower heart chambers; Ventricular septal defects; Ventriculoseptal defect; VSD","HPO_Name__c":"Ventricular septal defect","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Frequent (30-79%)","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":"ORPHA:3078","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Severe intellectual disability (ID) is defined as a type of ID characterized by severely sub-average adaptive functioning and intellectual functioning, with an intelligence quotient (IQ) the range of 20-34.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0010864","HPO_Synonym__c":"Early and severe mental retardation; Intellectual disability, severe; Mental retardation, severe; Severe mental retardation","HPO_Name__c":"Severe intellectual disability","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005781","HPO_Name__c":"Contractures of the large joints","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormal dilatation of the fourth cerebral ventricle.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002198","HPO_Synonym__c":"Enlarged fourth ventricle","HPO_Name__c":"Dilated fourth ventricle","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","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":"ORPHA:3078","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A fontanelle that is small for age.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005486","HPO_Synonym__c":"Little fontanelle; Microfontanelle; Small soft spot","HPO_Name__c":"Small fontanelle","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008110","HPO_Name__c":"Equinovarus deformity","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An increased susceptibility to upper respiratory tract infections as manifested by a history of recurrent upper respiratory tract infections (running ears - otitis, sinusitis, pharyngitis, tonsillitis).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002788","HPO_Synonym__c":"Frequent upper respiratory infections; Frequent upper respiratory tract infections; Recurrent colds; Recurrent upper respiratory and lower respiratory infections; Recurrent upper respiratory infection; Recurrent upper respiratory infections; Recurrent URI; Upper respiratory tract infections; Upper respiratory tract infections, recurrent","HPO_Name__c":"Recurrent upper respiratory tract infections","Feature_System__c":"Respiratory system; Immune System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001374","HPO_Synonym__c":"Congenital dislocation of the hip; Congenital dislocation of the hips; Congenital hip anomaly; Congenital hip dislocations; Dislocated hip since birth","HPO_Name__c":"Congenital hip dislocation","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","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":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A congenital brain malformation typically characterized by incomplete formation of the cerebellar vermis, dilation of the fourth ventricle, and enlargement of the posterior fossa. In layman's terms, Dandy Walker malformation is a cyst in the cerebellum (typically symmetrical) that is involved with the fourth ventricle. This may interfere with the ability to drain cerebrospinal fluid from the brain, resulting in hydrocephalus. Dandy Walker cysts are formed during early embryonic development, while the brain forms. The cyst in the cerebellum typically has several blood vessels running through it connecting to the brain, thereby prohibiting surgical removal.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001305","HPO_Synonym__c":"Dandy-walker anomaly; Dandy-Walker cyst","HPO_Name__c":"Dandy-Walker malformation","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The condition of inability to eat normally treated by placement of a thin tube through the nose into the stomach that is then used to carry food.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0040288","HPO_Name__c":"Nasogastric tube feeding","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"This is a postural deformity in which the foot is positioned up against the tibia. The heel (calcaneus) is positioned downward (that is, the ankle is flexed upward), and the heel is turned outward (valgus).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001848","HPO_Synonym__c":"Calcaneovalgus; Calcaneovalgus Foot; Valgus position of the calcaneus","HPO_Name__c":"Calcaneovalgus deformity","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","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":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An abnormality of the pinna, which is also referred to as the auricle or external ear.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000377","HPO_Synonym__c":"Abnormal form of ears; Abnormally shaped ears; Auricular malformation; Deformed auricles; Deformed ears; Dysplastic ears; Malformation of auricle; Malformed auricles; Malformed ears; Malformed external ears; Minor malformation of the auricles; Poorly defined conchae","HPO_Name__c":"Abnormal pinna morphology","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Recurrent episodes of apnea occurring during infancy.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005949","HPO_Name__c":"Apneic episodes in infancy","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Atrophy of the optic nerve. Optic atrophy results from the death of the retinal ganglion cell axons that comprise the optic nerve and manifesting as a pale optic nerve on fundoscopy.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000648","HPO_Synonym__c":"Optic nerve atrophy; Optic-nerve degeneration","HPO_Name__c":"Optic atrophy","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Blindness is the condition of lacking visual perception defined as a profound reduction in visual perception. On the 6m visual acuity scale, blindness is defined as less than 3/60. On the 20ft visual acuity scale, blindness is defined as less than 20/400. On the decimal visual acuity scale, blindness is defined as less than 0.05. Blindness is typically characterized by a visual field of no greater than 10 degrees in radius around central fixation.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000618","HPO_Synonym__c":"Blindness; Total vision loss","HPO_Name__c":"Blindness","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A severe degree of muscular hypotonia characterized by markedly reduced muscle tone.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006829","HPO_Synonym__c":"Hypotonia, severe; Severely decreased muscle tone","HPO_Name__c":"Severe muscular hypotonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Partial or complete wasting (loss) of brain tissue that was once present.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012444","HPO_Synonym__c":"Brain degeneration; Brain wasting","HPO_Name__c":"Brain atrophy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Severely slow or limited growth after birth, being four standard deviations or more below age- and sex-related norms.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008850","HPO_Synonym__c":"Marked growth retardation; Severe growth delay in children; Severe postnatal growth deficiency; Severe postnatal growth failure","HPO_Name__c":"Severe postnatal growth retardation","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A condition in which there is increased muscle tone so that arms or legs, for example, are stiff and difficult to move.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001276","HPO_Synonym__c":"Hypertonicity; Increased muscle tone","HPO_Name__c":"Hypertonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","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":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Median longitudinal ear length greater than two standard deviations above the mean and median ear width greater than two standard deviations above the mean (objective); or, apparent increase in length and width of the pinna (subjective).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000400","HPO_Synonym__c":"Large ears; Large pinnae","HPO_Name__c":"Macrotia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Smaller than normal size according to sex and gestational age related norms, defined as a weight below the 10th percentile for the gestational age.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001518","HPO_Synonym__c":"Birth weight less than 10th percentile; Low birth weight; Small for gestational age","HPO_Name__c":"Small for gestational age","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","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":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","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":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A thumb with three phalanges in a single, proximo-distal axis. Thus, this term applies if the thumb has an accessory phalanx, leading to a digit like appearance of the thumb.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001199","HPO_Synonym__c":"Accessory phalanx of the thumb; Digitalized thumb; Finger-like thumb; Triphalangeal thumbs; Triphalangy of thumb","HPO_Name__c":"Triphalangeal thumb","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:3078","HPO_Frequency__c":"Very frequent (80-99%)","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":"ORPHA:3078","HPO_Frequency__c":"Occasional (5-29%)","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"}}],"tags":{"Cause":["Genetics"],"Disease Category":["Genetics","Neurology","Congenital Abnormality"],"Specialist":["Genetics","Neurology","Ophthalmology","Neuro-Ophthalmology","Neurodevelopmental disabilities","Pediatrics"]},"synonyms":["gustavson syndrome"," intellectual developmental disorder with optic atrophy, deafness, and seizures"," mrxsg"]}