| 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:0000505 | Impaired vision | |
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| HP:0000544 | External ophthalmoplegia | |
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| HP:0000648 | Optic atrophy | |
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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: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:0001272 | Cerebellar atrophy | |
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| HP:0001344 | Absent speech development | |
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| HP:0001347 | Hyperreflexia | "The presence of overactive or overresponsive reflexes." [HPO:curators] |
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| HP:0002015 | Dysphagia | "Difficulty in swallowing." [HPO:curators] |
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| HP:0002521 | Hypsarrhythmia | "Hypsarrhythmia is abnormal interictal high amplitude waves and a background of irregular spikes demonstrated by electroencephalography (EEG)." [HPO:curators] |
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| HP:0002540 | Inability to walk | |
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| HP:0003593 | Early onset | |
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| HP:0003676 | Progressive disorder | |
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| HP:0006829 | Severe muscular hypotonia | "A severe degree of muscular hypotonia characterized by markedly reduced muscle tone." [HPO:curators] |
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| HP:0009830 | Peripheral neuropathy | "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:curators] |
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