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Subacute necrotizing encephalopathy: oxidative phosphorylation defects and the ATPase 6 point mutation
J M Shoffner1, P M Fernhoff, N S Krawiecki
1Department of Genetics and Molecular Medicine, Emory University School of Medicine, Atlanta, GA 30329.
Neurology
|November 1, 1992
Summary
Subacute necrotizing encephalopathy (SNE) involves oxidative phosphorylation (OXPHOS) defects. A specific mitochondrial DNA mutation was identified in one SNE family, highlighting the need for genetic screening.
Area of Science:
- Biochemistry
- Genetics
- Neuroscience
Background:
- Subacute necrotizing encephalopathy (SNE), also known as Leigh's disease, is linked to oxidative phosphorylation (OXPHOS) dysfunction.
- The precise connection between OXPHOS defects and mutations in nuclear or mitochondrial DNA (mtDNA) remains incompletely understood.
Observation:
- Three SNE pedigrees were assessed for OXPHOS abnormalities and specific mtDNA point mutations.
- Complex I deficiency was detected in all pedigrees, with a concurrent Complex III defect in two individuals.
Findings:
- A heteroplasmic mtDNA mutation in the ATPase, subunit 6 gene (np 8993) was identified in one SNE pedigree.
- This mutation, maternally inherited, exhibited significant clinical and biochemical variability within the family, with mutation levels ranging widely.
- The identified mtDNA mutation was absent in the other two SNE pedigrees.
Implications:
- These findings underscore the critical importance of screening for OXPHOS defects in SNE patients.
- Genetic testing for mtDNA mutations should be considered in the diagnostic workup of SNE.
- Understanding the genetic basis of SNE can lead to improved diagnosis and management strategies.