{"Name":"Alpha-N-acetylgalactosaminidase deficiency type 1","DiseaseID__c":"GARD:0000116","id":116,"encodedName":"alpha-n-acetylgalactosaminidase-deficiency-type-1","IsDeleted":false,"Disease_Name_Full__c":"Alpha-N-acetylgalactosaminidase deficiency type 1","Xref_IDs__c":"423022890; 879937000; C1836544; DOID:0112318; MEDGEN:373113; MONDO:0012221; OMIM:609241; ORPHA:79279","USA_Estimate__c":"1,000","No_of_Specialist_Tagsa__c":7,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":0,"No_of_HHS_records__c":1,"World_Estimate__c":"1 to 8,000","No_of_HRSA_records__c":0,"Evidence_Based_Score__c":1,"No_of_Disease_Descriptions__c":4,"Disease_Characteristics_Score__c":8,"No_of_Age_at_Onset__c":2,"Description_Source__c":"MONDO:0012221","Disease_Description__c":"A very rare and severe type of NAGA deficiency characterized by infantile neuroaxonal dystrophy.","GARD_Name__c":"Alpha-N-acetylgalactosaminidase deficiency type 1","GARD_Synonym__c":"alpha-n-acetylgalactosaminidase deficiency, type i; naga (alpha-n-acetylgalactosaminidase) deficiency type 1; naga deficiency type 1; naga deficiency, type i; neuroaxonal dystrophy, schindler type; schindler disease type 1; schindler disease, type i; schindler disease, type iii","Curated_Disease_Description_Source__c":"GARD:0000116","Curated_Disease_Description__c":"Alpha-N-acetylgalactosaminidase deficiency type 1 is an inherited condition that primarily causes neurological problems. There are three types of Alpha-N-acetylgalactosaminidase deficiencies. Alpha-N-acetylgalactosaminidase deficiency type 1, also called the infantile type, is the most severe form. Affected individuals may have developmental delay, developmental regression (they lose developmental skills), blindness, and seizures, and they eventually lose awareness of their surroundings and become unresponsive. People with this form of the condition usually don't survive past early childhood. Alpha-N-acetylgalactosaminidase deficiency type 1 is caused by genetic changes in the NAGA gene. The condition follows an autosomal recessive pattern of inheritance.","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:79279","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0012221","ORPHANET_ID__c":"ORPHA:79279","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Deficiencia de alfa-n-acetilgalactosaminidasa tipo 1","Spanish_Description_Source__c":"ORPHA:79279","Spanish_Description__c":"Es un tipo de deficiencia de alfa-N-acetilgalactosaminidasa (NAGA) muy poco frecuente y grave caracterizada por una distrofia neuroaxonal infantil.","Spanish_Disease_Name__c":"deficiencia de alfa-n-acetilgalactosaminidasa tipo 1","Spanish_GARD_Synonym__c":"deficiencia de naga tipo 1; enfermedad de schindler tipo 1","Category_Linearization__c":"ORPHA:68367","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":"Alpha-N-acetylgalactosaminidase deficiency type 1 is an inherited condition that primarily causes neurological problems. There are three types of Alpha-N-acetylgalactosaminidase deficiencies. Alpha-N-acetylgalactosaminidase deficiency type 1, also called the infantile type, is the most severe form. Affected individuals may have developmental delay, developmental regression (they lose developmental skills), blindness, and seizures, and they eventually lose awareness of their surroundings and become unresponsive. People with this form of the condition usually don't survive past early childhood. Alpha-N-acetylgalactosaminidase deficiency type 1 is caused by genetic changes in the NAGA gene. The condition follows an autosomal recessive pattern of inheritance.","Curated_Disease_Description_Source__c":"GARD:0000116","GARD_Synonym__c":"alpha-n-acetylgalactosaminidase deficiency, type i; naga (alpha-n-acetylgalactosaminidase) deficiency type 1; naga deficiency type 1; naga deficiency, type i; neuroaxonal dystrophy, schindler type; schindler disease type 1; schindler disease, type i; schindler disease, type iii","Name":"Alpha-N-acetylgalactosaminidase deficiency type 1","Curated_USA_Estimate__c":"1,000","estimateUsa":"1,000"}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Metabolic Support UK","Website__c":"https://www.metabolicsupportuk.org"},{"Account_Name__c":"Childhood Dementia Initiative","Website__c":"https://www.childhooddementia.org/"},{"Account_Name__c":"The International Advocates for Glycoprotein Storage Diseases (ISMRD)","Website__c":"https://www.ismrd.org/"}],"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":"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":"Lysosomal","Tag_Category__c":"Account;Cause;Disease Category","category_description":"Lysosomal storage diseases are a group of genetic metabolic diseases that affect the ability of the body's cells to break down substances and remove toxins.","curated_tag_name":"Lysosomal storage diseases"},{"Tag_Name__c":"Epilepsy","Tag_Category__c":"Account;Specialist","curated_tag_name":"Epilepsy"},{"Tag_Name__c":"Anterior segment of Eye","Tag_Category__c":"Specialist","curated_tag_name":"Front part of eye disease"},{"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":"Neonatal","Provided_By__c":"ORPHA:79279"},{"Age_At_Onset__c":"Infancy","Provided_By__c":"ORPHA:79279"}],"External_Identifier_Disease__c":[{"URL__c":"https://raresource.nih.gov/diseases/filter/0000116","Source__c":"RareSource"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A0112318","Source__c":"MONDO:0012221","Xref__c":"DOID:0112318"},{"URL__c":"https://www.orpha.net/en/disease/detail/79279","Source__c":"C1836544; MONDO:0012221; ORPHA:79279","Xref__c":"ORPHA:79279"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C1836544","Source__c":"C1836544","Xref__c":"C1836544"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=373113","Source__c":"C1836544","Xref__c":"MEDGEN:373113"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=879937000","Source__c":"C1836544; MONDO:0012221","Xref__c":"879937000"},{"URL__c":"https://www.omim.org/entry/609241","Source__c":"C1836544; MONDO:0012221; ORPHA:79279","Xref__c":"OMIM:609241"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0012221","Source__c":"GARD:0000116","Xref__c":"MONDO:0012221"},{"URL__c":"https://secure.ssa.gov/apps10/poms.nsf/lnx/0423022890","Xref__c":"423022890"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"NAGA","GHR_URL__c":"https://medlineplus.gov/genetics/gene/naga","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Autosomal recessive"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:79279","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":"ORPHA:79279","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Reduced strength of muscles.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001324","HPO_Synonym__c":"Muscle weakness; Muscular weakness","HPO_Name__c":"Muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Peripheral neuropathy is a general term for any disorder of the peripheral nervous system. The main clinical features used to classify peripheral neuropathy are distribution, type (mainly demyelinating versus mainly axonal), duration, and course.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009830","HPO_Synonym__c":"Peripheral nerve damage; Peripheral neuritis","HPO_Name__c":"Peripheral neuropathy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","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":"ORPHA:79279","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Presence of small, permanently dilated blood vessels near the surface of the skin, visible as small focal red lesions.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100585","HPO_Synonym__c":"Teleangiectasia of the skin","HPO_Name__c":"Telangiectasia of the skin","Feature_System__c":"Skin System; Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","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":"ORPHA:79279","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Abnormal sensations such as tingling, pricking, or numbness of the skin with no apparent physical cause.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003401","HPO_Synonym__c":"Paresthesias; Pins and needles feeling; Tingling","HPO_Name__c":"Paresthesia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","HPO_Frequency__c":"Frequent (30-79%)","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":"ORPHA:79279","HPO_Frequency__c":"Occasional (5-29%)","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":"ORPHA:79279","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Localized fluid retention and tissue swelling caused by a compromised lymphatic system.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001004","HPO_Synonym__c":"Lymphatic obstruction; Lymphoedema; Onset of lymphedema around puberty; Swelling caused by excess lymph fluid under skin","HPO_Name__c":"Lymphedema","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Loss of strength in the arm, leg, and sometimes face on one side of the body. Hemiplegia refers to a severe or complete loss of strength, whereas hemiparesis refers to a relatively mild loss of strength.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004374","HPO_Synonym__c":"Paralysis or weakness of one side of body","HPO_Name__c":"Hemiplegia/hemiparesis","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","HPO_Frequency__c":"Frequent (30-79%)","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:79279","HPO_Frequency__c":"Frequent (30-79%)","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:79279","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Telangiectasias refer to small dilated blood vessels located near the surface of the skin or mucous membranes, measuring between 0.5 and 1 millimeter in diameter. Telangiectasia are located especially on the tongue, lips, palate, fingers, face, conjunctiva, trunk, nail beds, and fingertips.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001009","HPO_Synonym__c":"Telangiectases","HPO_Name__c":"Telangiectasia","Feature_System__c":"Skin System; Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Hypertrophic cardiomyopathy (HCM) is defined by the presence of increased ventricular wall thickness or mass in the absence of loading conditions (hypertension, valve disease) sufficient to cause the observed abnormality.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001639","HPO_Synonym__c":"Cardiomyopathy, hypertrophic; Enlarged and thickened heart muscle; HCM","HPO_Name__c":"Hypertrophic cardiomyopathy","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A misalignment of the eyes so that the visual axes deviate from bifoveal fixation. The classification of strabismus may be based on a number of features including the relative position of the eyes, whether the deviation is latent or manifest, intermittent or constant, concomitant or otherwise and according to the age of onset and the relevance of any associated refractive error.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000486","HPO_Synonym__c":"Cross-eyed; Squint; Squint eyes","HPO_Name__c":"Strabismus","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","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":"ORPHA:79279","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007360","HPO_Synonym__c":"Absent/small cerebellum; Absent/underdeveloped cerebellum; Atrophy/Degeneration affecting the cerebellum; Atrophy/Hypoplasia of the cerebellum; Cerebellar hypoplasia/atrophy","HPO_Name__c":"Aplasia/Hypoplasia of the cerebellum","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A neurological condition related to lesions of the basal ganglia leading to typical abnormalities including akinesia (inability to initiate changes in activity and perform volitional movements rapidly and easily), muscular rigidity (continuous contraction of muscles with constant resistance to passive movement), chorea (widespread arrhythmic movements of a forcible, rapid, jerky, and restless nature), athetosis (inability to sustain the muscles of the fingers, toes, or other group of muscles in a fixed position), and akathisia (inability to remain motionless).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002071","HPO_Synonym__c":"Extrapyramidal dysfunction; Extrapyramidal signs; Extrapyramidal symptoms; Extrapyramidal syndrome; Extrapyramidal tract signs","HPO_Name__c":"Abnormality of extrapyramidal motor function","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","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":"ORPHA:79279","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Rhythmic, involuntary oscillations of one or both eyes related to abnormality in fixation, conjugate gaze, or vestibular mechanisms.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000639","HPO_Synonym__c":"Involuntary, rapid, rhythmic eye movements","HPO_Name__c":"Nystagmus","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","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":"ORPHA:79279","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Functional neurological abnormalities related to dysfunction of the pyramidal tract.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007256","HPO_Synonym__c":"Corticospinal signs; Pyramidal signs; Pyramidal tract signs","HPO_Name__c":"Abnormal pyramidal sign","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Peripheral neuropathy affecting the sensory nerves.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000763","HPO_Synonym__c":"Damage to nerves that sense feeling; Peripheral sensory neuropathy","HPO_Name__c":"Sensory neuropathy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormal sensation of spinning while the body is actually stationary.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002321","HPO_Synonym__c":"Dizzy spell","HPO_Name__c":"Vertigo","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","HPO_Frequency__c":"Very frequent (80-99%)","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:79279","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":"ORPHA:79279","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An anomaly of the brainstem.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002363","HPO_Synonym__c":"Abnormal shape of brainstem; Abnormality of brainstem morphology; Abnormality of the brainstem","HPO_Name__c":"Abnormal brainstem morphology","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:79279","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:79279","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Hyperkeratosis is a histopathological term defining a thickened stratum corneum and may be present in many different skin conditions, with many possible overlaps. Hyperkeratosis refers to the increased thickness of the stratum corneum, the outer layer of the skin. Hyperkeratosis is subclassified as orthokeratotic or parakeratotic. Orthokeratotic hyperkeratosis refers to the thickening of the keratin layer with preserved keratinocyte maturation, while parakeratotic hyperkeratosis shows retained nuclei as a sign of delayed maturation of keratinocytes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000962","HPO_Synonym__c":"Epidermal hyperkeratosis","HPO_Name__c":"Hyperkeratosis","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}}],"tags":{"Cause":["Genetics","Inborn Errors of Metabolism","Lysosomal"],"Disease Category":["Genetics","Neurology","Inborn Errors of Metabolism","Congenital Abnormality","Lysosomal"],"Specialist":["Genetics","Neurology","Ophthalmology","Epilepsy","Anterior segment of Eye","Neurodevelopmental disabilities","Pediatrics"],"Account":["Lysosomal","Epilepsy"]},"synonyms":["alpha-n-acetylgalactosaminidase deficiency, type i"," naga (alpha-n-acetylgalactosaminidase) deficiency type 1"," naga deficiency type 1"," naga deficiency, type i"," neuroaxonal dystrophy, schindler type"," schindler disease type 1"," schindler disease, type i"," schindler disease, type iii"]}