| 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:0000253 | Microcephaly, progressive | "Progressive microcephaly is diagnosed when the head circumference falls progressively behind age- and gender-dependent norms." [HPO:curators] |
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| HP:0000649 | Abnormality of vision evoked potentials | |
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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: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:0001319 | Neonatal hypotonia | "Muscular hypotonia (abnormally low muscle tone) manifesting in the neonatal period." [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:0001347 | Hyperreflexia | "The presence of overactive or overresponsive reflexes." [HPO:curators] |
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| HP:0002015 | Dysphagia | "Difficulty in swallowing." [HPO:curators] |
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| HP:0002033 | Poor suck | "An inadequate sucking reflex, resulting in the difficult of newborns to be breast-fed." [HPO:curators] |
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| HP:0002059 | Cerebral atrophy | |
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| HP:0002123 | Myoclonic seizures | "Myoclonic seizures are sudden, brief losses of consciousness and postural tone not associated with tonic muscular contractions. Myoclonic seizures may involve one body part or the entire body. In the latter case, the myoclonic seizure is accompanied by a violent fall but not by loss of consciousness." [HPO:curators] |
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| HP:0002205 | Recurrent respiratory infections | |
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| HP:0002521 | Hypsarrhythmia | "Hypsarrhythmia is abnormal interictal high amplitude waves and a background of irregular spikes demonstrated by electroencephalography (EEG)." [HPO:curators] |
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| HP:0003819 | Death in childhood | |
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| HP:0011167 | Focal tonic seizures | "Seizures with sustained increase in muscle contraction in parts of the body lasting a few seconds to minutes." [HPO:jalbers] |
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| HP:0011168 | Eyelid myoclonias | "Focal seizure with eyelid myoclonia, not eyelid myoclonias in the context of absence seizures." [HPO:ihelbig] |
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| HP:0012448 | Delayed myelination | "`Delayed` (PATO:0000502) `myelination` (GO:0042552)." [ORCID:0000-0001-5208-3432] |
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| HP:0012469 | Infantile spasms | "Infantile spasms represent a subset of "epileptic spasms". Infantile Spasms are epileptic spasms starting in the first year of life (infancy)." [HPO:ihelbig] |
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| HP:0200134 | Epileptic encephalopathy | |
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