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The mitochondrial ND6 gene is a hot spot for mutations that cause Leber's hereditary optic neuropathy

Lookup NU author(s): Professor Patrick Chinnery, Dr Richard Andrews, Dr Rajinder Singh-Kler, Emeritus Professor Doug Turnbull

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Abstract

Leber's hereditary optic neuropathy (LHON) is a common cause of bilateral optic nerve disease. The majority of LHON patients harbour one of three point mutations of the mitochondrial DNA (mtDNA) complex I, or NADH:ubiquinone oxidoreductase (ND) genes (G11778A in ND4, G3460A in ND1, T14484C in ND6). As a consequence, screening for these mutations has become part of the routine clinical investigation of young adults who present with bilateral optic neuropathy, and the absence of these mutations is interpreted as indicating there is a low likelihood that an optic neuropathy is LHON. However, there are many individuals who develop the clinical features of LHON but who do not harbour one of these primary LHON mutations. We describe two LHON pedigrees that harbour the same novel point mutation within the mtDNA ND6 gene (A14495G). This mutation was heteroplasmic in both families, and sequencing of the mitochondrial genome confirmed that the mutation arose on two independent occasions. This is the seventh mutation in tile ND6 gene that causes optic neuropathy, indicating that this gene is a hot spot for LHON mutations. Protein modelling studies indicate that all of these pathogenic mutations lie within close proximity to one another in a hydrophobic cleft or pocket. This is the first evidence for a relationship between a specific disease phenotype and a specific structural domain within a mitochondrial respiratory chain subunit. These findings suggest that the mtDNA ND6 gene should be sequenced in all patients with LHON who do not harbour one of the three common LHON mutations.

Publication metadata

Author(s): Chinnery PF, Brown DT, Andrews RM, Singh-Kler R, Riordan-Eva P, Lindley J, Applegarth DA, Turnbull DM, Howell N

Publication type: Article

Publication status: Published

Journal: Brain

Year: 2001

Volume: 124

Issue: 1

Pages: 209-218

Print publication date: 01/01/2001

ISSN (print): 0006-8950

ISSN (electronic):

Publisher: Oxford University Press

URL: http://dx.doi.org/10.1093/brain/124.1.209

DOI: 10.1093/brain/124.1.209

PubMed id: 11133798

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