| 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:0000365 | Hearing loss | |
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| HP:0000572 | Visual loss | |
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| HP:0000618 | Blindness | |
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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:0000648 | Optic atrophy | |
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| HP:0000649 | Abnormality of vision evoked potentials | |
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| HP:0000750 | Impaired language development | |
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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:0001252 | Muscular hypotonia | "Muscular hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle), often involving reduced muscle strength. Hypotonia is characterized by a diminished resistance to passive stretching." [HPO:curators] |
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| HP:0001254 | Lethargy | |
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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:0001259 | Coma | |
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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:0001476 | Delayed closure of the anterior fontanelle | "A delay in closure (ossification) of the anterior fontanelle, which generally undergoes closure around the 18th month of life." [HPO:curators] |
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| HP:0002015 | Dysphagia | "Difficulty in swallowing." [HPO:curators] |
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| HP:0002020 | Gastroesophageal reflux | |
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| HP:0002179 | Opisthotonus | |
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| HP:0002197 | Generalized seizures | "Recurrent generalized `seizures` (HP:0001250), that is seizures that affect both cerebral hemispheres from the start of the seizure, producing loss of consciousness." [HPO:probinson] |
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| HP:0002353 | EEG abnormalities | "Abnormality observed by electroencephalogram (EEG), which is used to record of the brain s spontaneous electrical activity from multiple electrodes placed on the scalp." [HPO:curators] |
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| HP:0002360 | Sleep disturbances | "An abnormality of sleep including such phenomena as 1) insomnia/hypersomnia, 2) non-restorative sleep, 3) sleep schedule disorder, 4) excessive daytime somnolence, 5) sleep apnea, and 6) restlessness." [HPO:curators] |
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| HP:0002376 | Developmental regression | |
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| HP:0002977 | Aplasia/Hypoplasia involving the central nervous system | |
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| HP:0007305 | Cns demyelination | |
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| HP:0007730 | Reduced iris pigmentation | |
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| HP:0011342 | Mild global developmental delay | "A mild delay in the achievement of motor or mental milestones in the domains of development of a child." [DDD:hvfirth] |
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| HP:0012444 | Brain atrophy | "Partial or complete wasting (loss) of brain tissue that was once present." [HPO:probinson] |
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