| HP:0000007 | Autosomal recessive inheritance | "A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in homozygotes. In the context of medical genetics, autosomal recessive disorders manifest in homozygotes (with two copies of the mutant allele) or compound heterozygotes (whereby each copy of a gene has a distinct mutant allele)." [HPO:curators] |
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| HP:0000252 | Microcephaly | "Microcephaly is a neurodevelopmental disorder in which the circumference of the head is more than two standard deviations smaller than the age- and gender-dependent norm." [HPO:curators] |
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| HP:0000280 | Coarse facial features | |
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| HP:0000505 | Impaired vision | |
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| HP:0001250 | Seizures | "Seizures are an intermittent `abnormality of the central nervous system` (FMA:HP:0002011) due to a sudden, excessive, disorderly discharge of cerebral neurons and characterized clinically by some combination of disturbance of sensation, loss of consciousness, impairment of psychic function, or convulsive movements." [HPO:probinson] |
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| HP:0001263 | Developmental retardation | "A delay in the achievement of motor or mental milestones manifested prior to age 18 and generally associated with lifelong mental and/or physical impairments." [HPO:curators] |
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| HP:0001508 | Failure to thrive | |
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| HP:0001522 | Death in infancy | |
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| HP:0001622 | Premature birth | |
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| HP:0002283 | Diffuse brain atrophy | |
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| HP:0002313 | Spastic paraparesis | |
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| HP:0002353 | EEG abnormalities | "Abnormality observed by electroencephalogram (EEG), which is used to record of the brain s spontaneous electrical activity from multiple electrodes placed on the scalp." [HPO:curators] |
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| HP:0002415 | Leukodystrophy | |
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| HP:0002587 | Projectile vomiting | |
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| HP:0002751 | Kyphoscoliosis | |
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| HP:0002804 | Arthrogryposis multiplex congenita | |
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| HP:0003269 | Sudanophilic leukodystrophy | |
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| HP:0003676 | Progressive disorder | |
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| HP:0005876 | Joint contractures, progressive | |
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| HP:0006918 | Cerebral sclerosis, diffuse | |
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| HP:0007256 | Mild pyramidal signs | |
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| HP:0007371 | Atrophy/Degeneration of the corpus callosum | "The presence of atrophy (wasting) of the corpus callosum." [HPO:sdoelken] |
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| HP:0008936 | Muscular hypotonia of the trunk | "Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk." [HPO:curators] |
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