| 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:0000175 | Cleft palate | "Cleft palate is a developmental defect of the `palate` (FMA:54549) resulting from a failure of fusion of the palatine processes." [HPO:curators] |
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| HP:0000505 | Impaired vision | |
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| HP:0000508 | Ptosis | "Drooping of the eyelid." [HPO:curators] |
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| HP:0000602 | Ophthalmoplegia | |
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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: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:0001285 | Spastic tetraparesis | "Spastic weakness affecting all four limbs." [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: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:0001344 | Absent speech development | |
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| HP:0001396 | Cholestasis | |
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| HP:0001403 | Macrovesicular steatosis | |
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| HP:0001508 | Failure to thrive | |
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| HP:0002067 | Bradykinesia | "Bradykinesia literally means slow movement, and is used clinically to denote a slowness in the execution of movement (in contrast to hypokinesia, which is used to refer to slowness in the initiation of movement)." [HPO:curators] |
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| HP:0002079 | Hypoplasia of the corpus callosum | "Underdevelopment of the corpus callosum." [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:0002240 | Hepatomegaly | "An abnormal enlargment of the liver." [HPO:curators] |
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| HP:0002352 | Leukoencephalopathy | |
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| HP:0002376 | Developmental regression | |
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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:0003200 | Ragged-red muscle fibers | "An abnormal appearance of muscle fibers observed on muscle biopsy. Ragged red fibers can be visualized with Gomori trichrome (GT) staining as irregular and intensely red subsarcolemmal zones, whereas the normal myofibrils are green. The margins of affect fibers appear red and ragged." [HPO:curators] |
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| HP:0003593 | Early onset | |
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| HP:0006989 | Dysplastic corpus callosum | |
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| HP:0008347 | Decreased activity of mitochondrial respiratory complexes i, ii+iii, and iv | |
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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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