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Mitochondrial DNA mutation associated with Leber's hereditary optic neuropathy
D C Wallace1, G Singh, M T Lott
1Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322.
Science (New York, N.Y.)
|December 9, 1988
Summary
Leber's hereditary optic neuropathy, a mitochondrial disease, is linked to a specific mutation in the NADH dehydrogenase subunit 4 gene. This genetic change offers a simple diagnostic test for the optic nerve and heart condition.
Area of Science:
- Genetics
- Neurology
- Mitochondrial Diseases
Background:
- Leber's hereditary optic neuropathy (LHON) is a maternally inherited condition.
- It causes optic nerve degeneration and cardiac dysrhythmia.
- Mitochondrial DNA mutations are implicated in energy production and disease.
Purpose of the Study:
- To identify the genetic cause of Leber's hereditary optic neuropathy in affected families.
- To investigate the correlation between mitochondrial DNA mutations and the disease phenotype.
- To establish a diagnostic method for the identified mutation.
Main Methods:
- Mitochondrial DNA sequencing to identify mutations.
- Analysis of mutation correlation within multiple families.
- Restriction fragment analysis to detect the Sfa NI site alteration.
Main Results:
- A mitochondrial DNA replacement mutation was identified in the NADH dehydrogenase subunit 4 gene.
- The mutation changed a highly conserved arginine to histidine at codon 340.
- This specific mutation eliminated a diagnostic Sfa NI restriction enzyme site.
Conclusions:
- A nucleotide change in a mitochondrial DNA energy production gene can cause neurological disease.
- The identified mutation provides a simple diagnostic marker for Leber's hereditary optic neuropathy.
- This finding highlights the link between mitochondrial function and neurological health.