| 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:0000256 | Macrocephaly | "The presence of an abnormally large `skull` (FMA:46565)." [HPO:probinson] |
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| HP:0000365 | Hearing loss | |
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| HP:0000486 | Strabismus | "Strabismus (also known as squint) is a condition in which the eyes are not properly aligned with each other." [HPO:curators] |
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| HP:0000639 | Nystagmus | "Rhythmic, involuntary oscillations of one or both eyes related to abnormality in fixation, conjugate gaze, or vestibular mechanisms." [HPO:curators] |
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| HP:0000648 | Optic atrophy | |
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| HP:0000708 | Behavioural/Psychiatric Abnormality | |
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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: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:0001272 | Cerebellar atrophy | |
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| HP:0001285 | Spastic tetraparesis | "Spastic weakness affecting all four limbs." [HPO:curators] |
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| HP:0002062 | Abnormality of the pyramidal tracts | "An abnormality of the pyramidal system of motor neurons, whose chief element, the corticospinal tract, is the only direct connection between the brain and the spinal cord. In addition to the corticospinal tract, the pyramidal system includes the corticobulbar, corticomesencephalic, and corticopontine tracts." [HPO:curators] |
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| HP:0002071 | Extrapyramidal signs | |
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| HP:0002171 | Gliosis | |
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| HP:0002283 | Diffuse brain atrophy | |
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| HP:0002352 | Leukoencephalopathy | |
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| HP:0002357 | Dysphasia | |
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| HP:0002376 | Developmental regression | |
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| HP:0002383 | Encephalitis | |
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| HP:0003593 | Early onset | |
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| HP:0004375 | Neoplasia of the nervous system | |
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| HP:0006887 | Mental retardation, progressive | "Mental retardation is defined as a decreased intelligence quotient of varying degree. The term progressive mental retardation should be used if intelligence decreases/deteriorates over time." [HPO:curators] |
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| HP:0007256 | Mild pyramidal signs | |
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| HP:0007258 | Severe demyelination of the white matter | |
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| HP:0007360 | Aplasia/Hypoplasia of the cerebellum | |
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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:0010864 | Mental retardation, severe | "Moderate mental retardation is defined as an intelligence quotient (IQ) in the range of 20-34." [HPO:probinson] |
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| HP:0040144 | L-2-hydroxyglutaric aciduria | |
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| HP:0040147 | L-2-hydroxyglutaric acidemia | |
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