| 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:0000340 | Sloping forehead | "A form of the forehead that slopes from top to bottom in an anterior direction." [HPO:curators] |
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| HP:0000369 | Low-set ears | "Low-set ears are defined to be set below an arbitrary line drawn between the lateral canthus of the eye and the occipital protruberance." [HPO:curators] |
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| HP:0000431 | Broad nasal bridge | "Increased horizontal dimension of the upper, bony part of the nose." [HPO:curators] |
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| HP:0000510 | Retinitis pigmentosa | "Hereditary degeneration and atrophy of the retina." [HPO:curators] |
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| HP:0000572 | Visual loss | |
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| HP:0001105 | Retinal atrophy | |
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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: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:0001268 | Mental deterioration | |
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| HP:0001272 | Cerebellar atrophy | |
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| HP:0001939 | Metabolism abnormality | |
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| HP:0002059 | Cerebral atrophy | |
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| HP:0002063 | Rigidity | |
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| HP:0002074 | Autofluorescent lipopigment in neurons | |
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| HP:0002093 | Respiratory insufficiency | |
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| HP:0002104 | Apnea | "Lack of breathing with no movement of the respiratory muscles and no exchange of air in the lungs. This term refers to a disposition to have recurrent episodes of apnea rather than to a single event." [HPO:curators] |
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| HP:0002133 | Status epilepticus | |
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| HP:0002529 | Neuropathology shows neuronal loss in basal ganglia, brainstem, and cerebellum | |
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| HP:0002878 | Early respiratory failure | |
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| HP:0003390 | Sensory axonal neuropathy | "An axonal neuropathy of peripheral sensory nerves." [HPO:curators] |
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| HP:0003577 | Onset at birth | |
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| HP:0005458 | Obliterated fontanelles | "Normally, the posterior and lateral fontanelles are obliterated by about six months after birth, the anterior fontanelle closes by about the middle of the second year. This term refers to the situation in which the fontanelles close at an inappropriately early time point." [HPO:curators] |
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| HP:0006887 | Mental retardation, progressive | "Mental retardation is defined as a decreased intelligence quotient of varying degree. The term progressive mental retardation should be used if intelligence decreases/deteriorates over time." [HPO:curators] |
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| HP:0010864 | Mental retardation, severe | "Moderate mental retardation is defined as an intelligence quotient (IQ) in the range of 20-34." [HPO:probinson] |
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