| 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:0000407 | Hearing loss, sensorineural | "Hearing loss caused by damage or dysfunction of the auditory nerve (cranial nerve VIII)." [HPO:curators] |
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| HP:0000486 | Strabismus | "Strabismus (also known as squint) is a condition in which the eyes are not properly aligned with each other." [HPO:curators] |
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| HP:0000508 | Ptosis | "Drooping of the eyelid." [HPO:curators] |
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| HP:0000543 | Pale optic disks | |
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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: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: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:0001265 | Hyporeflexia | |
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| HP:0001272 | Cerebellar atrophy | |
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| HP:0001290 | Generalized hypotonia | "Generalized muscular hypotonia (abnormally low muscle tone)." [HPO:curators] |
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| HP:0001324 | Muscle weakness | "Reduced strength of muscles." [HPO:curators] |
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| HP:0001347 | Hyperreflexia | "The presence of overactive or overresponsive reflexes." [HPO:curators] |
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| HP:0001399 | Hepatic failure | |
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| HP:0001423 | X-linked dominant inheritance | "A mode of inheritance that is observed for dominant traits related to a gene encoded on the X chromosome. In the context of medical genetics, X-linked dominant disorders tend to manifest very severely in affected males. The severity of manifestation in females may depend on the degree of skewed X inactivation." [HPO:curators] |
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| HP:0001427 | Mitochondrial inheritance | "A mode of inheritance that is observed for traits related to a gene encoded on the mitochondrial genome. Because the mitochondrial genome is almost always maternally inherited, a mitochondrial condition can only be transmitted by females, although the condition can affect both sexes. The proportion of mutant mitochondria can vary (heteroplasmy)." [HPO:curators] |
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| HP:0001508 | Failure to thrive | |
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| HP:0001510 | Growth retardation | |
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| HP:0001639 | Hypertrophic cardiomyopathy | |
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| HP:0001943 | Hypoglycemia | "A lower than normal level of blood glucose." [HPO:curators] |
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| HP:0002013 | Vomiting | |
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| HP:0002093 | Respiratory insufficiency | |
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| HP:0002181 | Cerebral edema | "Abnormal accumulation of fluid in the brain." [HPO:curators] |
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| HP:0002376 | Developmental regression | |
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| HP:0002415 | Leukodystrophy | |
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| HP:0002490 | Increased CSF lactate | "Increased concentration of lactate in the cerebrospinal fluid." [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:0003202 | Amyotrophy | "The presence of muscular atrophy (which is also known as amyotrophy)." [HPO:curators] |
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| HP:0003487 | Babinski sign | "Upturning of the big toe (and sometimes fanning of the other toes) in response to stimulation of the sole of the foot. If the Babinski sign is present it can indicate damage to the corticospinal tract." [HPO:curators] |
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| HP:0003546 | Exercise intolerance | |
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| HP:0003812 | Phenotypic variability | |
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| HP:0004481 | Macrocephaly, progressive | "The progressive development of an abnormally large skull." [HPO:curators] |
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| HP:0006965 | Acute necrotizing encephalopathy | |
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| HP:0008316 | Abnormal mitochondria on muscle biopsy | |
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| HP:0008872 | Feeding problems in infancy | |
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