| 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:0000253 | Microcephaly, progressive | "Progressive microcephaly is diagnosed when the head circumference falls progressively behind age- and gender-dependent norms." [HPO:curators] |
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| HP:0000529 | Progressive visual loss | |
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| HP:0000550 | Abolished electroretinogram (ERG) | |
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| HP:0000608 | Macular degeneration | |
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| HP:0000618 | Blindness | |
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| HP:0000648 | Optic atrophy | |
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| HP:0000654 | Decreased electroretinogram (ERG) | |
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| HP:0000716 | Depression | "A condition characterized by pervasive dysphoric mood, loss of interests, and inability to experience pleasure." [HPO:curators] |
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| HP:0000737 | Irritability | |
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| HP:0000738 | Hallucinations | |
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| HP:0001249 | Mental retardation | |
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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:0001251 | Ataxia | "Ataxia is a nonspecific neurological sign and symptom consisting of gross lack of coordination of muscle movements. Ataxia is caused by dysfunction of one or more parts of the nervous system including the cerebellum, the sensory nervous system, the vestibular system, or the cerebral cortex." [HPO:curators] |
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| HP:0001252 | Muscular hypotonia | "Muscular hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle), often involving reduced muscle strength. Hypotonia is characterized by a diminished resistance to passive stretching." [HPO:curators] |
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| HP:0001257 | Spasticity | "A motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes with increased muscle tone, exaggerated (hyperexcitable) tendon reflexes." [HPO:curators] |
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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:0001290 | Generalized hypotonia | "Generalized muscular hypotonia (abnormally low muscle tone)." [HPO:curators] |
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| HP:0001336 | Myoclonus | "Very brief, involuntary random muscular contractions occurring at rest, in response to sensory stimuli, or accompanying voluntary movements." [HPO:curators] |
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| HP:0001371 | Contractures | |
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| HP:0001939 | Metabolism abnormality | |
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| HP:0002059 | Cerebral atrophy | |
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| HP:0002074 | Autofluorescent lipopigment in neurons | |
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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:0002360 | Sleep disturbances | "An abnormality of sleep including such phenomena as 1) insomnia/hypersomnia, 2) non-restorative sleep, 3) sleep schedule disorder, 4) excessive daytime somnolence, 5) sleep apnea, and 6) restlessness." [HPO:curators] |
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| HP:0002361 | Psychomotor degeneration | |
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| HP:0002371 | Loss of speech | |
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| HP:0003674 | Age of onset | |
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| HP:0005484 | Microcephaly, postnatal | |
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