| 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:0000340 | Sloping forehead | "A form of the forehead that slopes from top to bottom in an anterior direction." [HPO:curators] |
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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:0001290 | Generalized hypotonia | "Generalized muscular hypotonia (abnormally low muscle tone)." [HPO:curators] |
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| HP:0001321 | Cerebellar hypoplasia | |
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| HP:0001332 | Dystonia | "An abnormally increased muscular tone that causes fixed abnormal postures. There is a slow, intermittent twisting motion that leads to exaggerated turning and posture of the extremities and trunk." [HPO:curators] |
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| HP:0002059 | Cerebral atrophy | |
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| HP:0002072 | Chorea | "Chorea (Greek for dance ) refers to widespread arrhythmic involuntary movements of a forcible, jerky and restless fashion." [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:0002119 | Ventriculomegaly | |
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| HP:0002169 | Clonus | |
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| HP:0002179 | Opisthotonus | |
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| HP:0002365 | Hypoplasia of the brainstem | |
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| HP:0002509 | Limb hypertonia | |
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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:0003577 | Onset at birth | |
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| HP:0007308 | Extrapyramidal dyskinesia | |
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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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| HP:0009879 | Cortical gyral simplification | "An abnormal reduction of the number and complexity of the pattern of gyrations of the cerebral cortex." [HPO:curators] |
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| HP:0011968 | Feeding difficulties | "Impaired ability to eat related to problems gathering food and getting ready to suck, chew, or swallow it." [ISCA:eriggs] |
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