| 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:0000505 | Impaired vision | |
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| HP:0000648 | Optic atrophy | |
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| HP:0001138 | Optic neuropathy | |
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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:0001251 | Ataxia | "Ataxia is a nonspecific neurological sign and symptom consisting of gross lack of coordination of muscle movements. Ataxia is caused by dysfunction of one or more parts of the nervous system including the cerebellum, the sensory nervous system, the vestibular system, or the cerebral cortex." [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:0001290 | Generalized hypotonia | "Generalized muscular hypotonia (abnormally low muscle tone)." [HPO:curators] |
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| HP:0001298 | Encephalopathy | |
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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:0001324 | Muscle weakness | "Reduced strength of muscles." [HPO:curators] |
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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:0001337 | Tremor | "An unintentional, oscillating to-and-fro muscle movement." [HPO:curators] |
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| HP:0001511 | Intrauterine growth retardation | |
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| HP:0001558 | Decreased fetal movement | "An abnormal reduction in quantity or strength of fetal movements." [HPO:curators] |
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| HP:0001643 | Patent ductus arteriosus | |
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| HP:0001644 | Dilated cardiomyopathy | |
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| HP:0001655 | Patent foramen ovale | |
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| HP:0002093 | Respiratory insufficiency | |
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| HP:0002119 | Ventriculomegaly | |
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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:0002240 | Hepatomegaly | "An abnormal enlargment of the liver." [HPO:curators] |
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| HP:0002878 | Early respiratory failure | |
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| HP:0003128 | Lactic acidemia | "An abnormal buildup of `lactic acid` (CHEBI:28358) in the body, leading to `acidification` (GO:0045851) of the blood." [HPO:probinson] |
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| HP:0003201 | Rhabdomyolysis | |
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| HP:0003236 | Elevated serum creatine phosphokinase | |
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| HP:0003812 | Phenotypic variability | |
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| HP:0003819 | Death in childhood | |
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| HP:0005157 | Concentric hypertrophic cardiomyopathy | |
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| HP:0008347 | Decreased activity of mitochondrial respiratory complexes i, ii+iii, and iv | |
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| HP:0008872 | Feeding problems in infancy | |
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| HP:0011923 | Decreased activity of mitochondrial complex I | "A reduction in the activity of the `mitochondrial respiratory chain complex I` (GO:0005747), which is part of the electron transport chain in mitochondria." [HPO:probinson] |
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| HP:0011924 | Decreased activity of mitochondrial complex III | "A reduction in the activity of the `mitochondrial respiratory chain complex III` (GO:0005750), which is part of the electron transport chain in mitochondria." [HPO:probinson] |
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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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