| 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: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:0001256 | Mental retardation, mild | "Mild mental retardation is defined as an intelligence quotient (IQ) in the range of 50-69." [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:0001270 | Motor retardation | |
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| HP:0001347 | Hyperreflexia | "The presence of overactive or overresponsive reflexes." [HPO:curators] |
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| HP:0002079 | Hypoplasia of the corpus callosum | "Underdevelopment of the corpus callosum." [HPO:curators] |
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| HP:0002352 | Leukoencephalopathy | |
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| HP:0003429 | Hypomyelination | |
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| HP:0003487 | Babinski sign | "Upturning of the big toe (and sometimes fanning of the other toes) in response to stimulation of the sole of the foot. If the Babinski sign is present it can indicate damage to the corticospinal tract." [HPO:curators] |
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| HP:0003593 | Early onset | |
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| HP:0003676 | Progressive disorder | |
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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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