| HP:0000006 | Autosomal dominant 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 heterozygotes. In the context of medical genetics, an autosomal dominant disorder is caused when a single copy of the mutant allele is present. Males and females are affected equally, and can both transmit the disorder with a risk of 50% for each child of inheriting the mutant allele." [HPO:curators] |
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| 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: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: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:0001260 | Dysarthria | "Dysarthric speech is a general description referring to a neurological speech disorder characterized by poor articulation. Depending on the involved neurological structures, dysarthria may be further classified as spastic, flaccid, ataxic, hyperkinetic and hypokinetic, or mixed." [HPO:curators] |
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| HP:0001270 | Motor retardation | |
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| HP:0001272 | Cerebellar atrophy | |
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| HP:0001290 | Generalized hypotonia | "Generalized muscular hypotonia (abnormally low muscle tone)." [HPO:curators] |
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| HP:0001355 | Megalencephaly | "The presence of an unusually large, and usually malfunctioning brain." [HPO:curators] |
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| HP:0002059 | Cerebral atrophy | |
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| HP:0002119 | Ventriculomegaly | |
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| HP:0002312 | Clumsiness | |
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| HP:0002344 | Progressive neurologic deterioration | |
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| HP:0003593 | Early onset | |
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| HP:0003677 | Slow progression | |
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| HP:0006943 | Diffuse spongiform leukoencephalopathy | |
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| HP:0007341 | Diffuse swelling of cerebral white matter | |
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