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NARP syndrome

Synonyms
Neuropathy ataxia retinitis pigmentosa syndrome
Modes of inheritance
Mitochondrial inheritance (Orphanet)

Summary

Excerpted from the GeneReview: Mitochondrial DNA-Associated Leigh Syndrome Spectrum
Mitochondrial DNA-associated Leigh syndrome spectrum (mtDNA-LSS) is part of a continuum of progressive neurodegenerative disorders caused by abnormalities of mitochondrial energy generation, which includes the overlapping phenotypes mtDNA-associated Leigh syndrome and mtDNA-associated Leigh-like syndrome. Mitochondrial DNA-LSS is characterized by onset of manifestations typically between ages three and 12 months, often following an intercurrent illness (usually viral) or metabolic challenge (vaccinations, surgery, prolonged fasting). Decompensation (often with elevated lactate levels in blood and/or cerebrospinal fluid) is typically associated with developmental delay and/or regression. Neurologic features include hypotonia, spasticity, seizures, movement disorders, cerebellar ataxia, and peripheral neuropathy. Brain stem dysfunction may manifest with respiratory symptoms, swallowing difficulties, ophthalmoparesis, and abnormalities in thermoregulation. Extraneurologic manifestations may include poor weight gain, cardiomyopathy, and conduction defects. Up to 50% of individuals die by age three years, most often from respiratory or cardiac failure.
Full text of GeneReview (by section):
Summary
Diagnosis
Clinical Characteristics
Genetically Related Disorders
Differential Diagnosis
Management
Genetic Counseling
Resources
Molecular Genetics
Chapter Notes
References
Authors:
Megan Ball
David R Thorburn
Shamima Rahman
view full author information

Available tests

15 tests are in the database for this condition.

Check Related conditions for additional relevant tests.

Clinical tests (15 available)

Molecular Genetics Tests

Genes See tests for all associated and related genes

  • Also known as: ATPase6, MTATP6, ATP6
    Summary: mitochondrially encoded ATP synthase 6

Clinical features

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Imported from Human Phenotype Ontology (HPO)

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