| 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: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:0000817 | Poor eye contact | |
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| HP:0001249 | Mental retardation | |
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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: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: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:0001310 | Dysmetria | |
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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:0001347 | Hyperreflexia | "The presence of overactive or overresponsive reflexes." [HPO:curators] |
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| HP:0002013 | Vomiting | |
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| HP:0002061 | Lower limb spasticity | |
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| HP:0002071 | Extrapyramidal signs | |
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| HP:0002079 | Hypoplasia of the corpus callosum | "Underdevelopment of the corpus callosum." [HPO:curators] |
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| HP:0002080 | Intention tremor | "An oscillatory cerebellar ataxia that tends to be absent when the limbs are inactive and during the first part of voluntary movement but worsening as the movement continues and greater precision is required (e.g., in touching a target such as the patient s nose or a physician s finger)." [HPO:curators] |
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| HP:0002151 | Increased serum lactate | "Abnormally increased level of blood lactate (2-hydroxypropanoic acid). Lactate is produced from pyruvate by lactate dehydrogenase during normal metabolism." [HPO:curators] |
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| HP:0002355 | Difficulty walking | |
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| HP:0002415 | Leukodystrophy | |
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| HP:0002421 | Poor head control | |
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| HP:0002506 | Diffuse cerebral atrophy | |
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| HP:0003828 | Variable expressivity | |
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| HP:0006808 | Hypomyelination of the brain | |
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| HP:0006895 | Lower limb hypertonia | |
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| HP:0007024 | Pseudobulbar paralysis | "Bilateral impairment of the function of the cranial nerves 9-12, which control musculature involved in eating, swallowing, and speech. Pseudobulbar paralysis is characterized clinically by dysarthria, dysphonia, and dysphagia with bifacial paralysis, and may be accompanied by `Pseudobulbar behavioral symptoms` (HP:0002193) such as enforced crying and laughing." [HPO:sdoelken] |
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| HP:0007153 | Progressive extrapyramidal movement disorder | |
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| HP:0007179 | Poor or absent smooth pursuit | |
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| HP:0007281 | Developmental arrest | |
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| HP:0009062 | Hypotonia, axial, in infancy | "Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk and with onset in infancy." [HPO:curators] |
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| HP:0030890 | Hyperintensity of cerebral white matter on MRI | "A brighter than expected signal on magnetic resonance imaging emanating from the cerebral white matter." [PMID:15576652] |
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