| 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: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: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:0001270 | Motor retardation | |
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| HP:0001302 | Pachygyria | "A congenital abnormality of the cerebral hemisphere chacterized by unusually thick gyrations (convolutions) of the cerebral cortex." [HPO:curators] |
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| HP:0001338 | Partial agenesis of the corpus callosum | "A partial failure of the development of the corpus callosum." [HPO:curators] |
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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:0002119 | Ventriculomegaly | |
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| HP:0002126 | Polymicrogyria | "A congenital abnormality of the cerebral hemisphere characterized by an excessive number of small gyri (convolutions) on the surface of the brain." [HPO:curators] |
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| HP:0002509 | Limb hypertonia | |
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| HP:0003593 | Early onset | |
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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:0100543 | Cognitive impairment | "Abnormality in the process of thought including the ability to process information." [HPO:sdoelken] |
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