| 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:0000365 | Hearing loss | |
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| HP:0000572 | Visual loss | |
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| HP:0000648 | Optic atrophy | |
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| HP:0000737 | Irritability | |
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| HP:0001034 | Hyperpigmented macules | |
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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: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:0001266 | Choreoathetosis | |
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| HP:0001290 | Generalized hypotonia | "Generalized muscular hypotonia (abnormally low muscle tone)." [HPO:curators] |
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| HP:0001336 | Myoclonus | "Very brief, involuntary random muscular contractions occurring at rest, in response to sensory stimuli, or accompanying voluntary movements." [HPO:curators] |
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| HP:0001344 | Absent speech development | |
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| HP:0001508 | Failure to thrive | |
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| HP:0002013 | Vomiting | |
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| HP:0002069 | Generalized tonic-clonic seizures | "Generalized tonic-clonic seizures are `generalized seizures` (HP:0002197) in which the patient suddenly loses conciousness, the eyes roll back, and the entire body musculature undergoes tonic contractions. In the clonic phase of the seizure, there are rhythmic contractions of the musculature alternating with relaxation of all muscle groups. Loss of sphincter control during the seizure is common. This form of seizure was formerly commonly called grand mal seizure." [HPO:curators] |
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| HP:0002133 | Status epilepticus | |
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| HP:0002283 | Diffuse brain atrophy | |
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| HP:0002376 | Developmental regression | |
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| HP:0002395 | Lower limb hyperreflexia | |
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| HP:0006834 | Developmental stagnation at onset of seizures | |
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| HP:0008872 | Feeding problems in infancy | |
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| HP:0012391 | Hyporeflexia of upper limbs | "Reduced intensity of muscle tendon reflexes in the upper limbs. Reflexes are elicited by stretching the tendon of a muscle, e.g., by tapping." [HPO:probinson] |
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| HP:0100704 | Cortical visual impairment | "A form of loss of vision caused by damage to the visual cortex rather than a defect in the eye." [HPO:probinson] |
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