Analysis of mitochondrial DNA sequences in patients with isolated or combined oxidative phosphorylation system deficiency.

Abstract:

BACKGROUND:Enzyme deficiencies of the oxidative phosphorylation (OXPHOS) system may be caused by mutations in the mitochondrial DNA (mtDNA) or in the nuclear DNA. OBJECTIVE:To analyse the sequences of the mtDNA coding region in 25 patients with OXPHOS system deficiency to identify the underlying genetic defect. RESULTS:Three novel non-synonymous substitutions in protein-coding genes, 4681T-->C in MT-ND2, 9891T-->C in MT-CO3 and 14122A-->G in MT-ND5, and one novel substitution in the 12S rRNA gene, 686A-->G, were found. The definitely pathogenic mutation 3460G-->A was identified in an 18-year-old woman who had severe isolated complex I deficiency and progressive myopathy. CONCLUSIONS:Bioinformatic analyses suggest a pathogenic role for the novel 4681T-->C substitution found in a boy with Leigh's disease. These results show that the clinical phenotype caused by the primary Leber's hereditary optic neuropathy mutation 3460G-->A is more variable than has been thought. In the remaining 23 patients, the role of mtDNA mutations as a cause of the OXPHOS system deficiency could be excluded. The deficiency in these children probably originates from mutations in the nuclear genes coding for respiratory enzyme subunits or assembly factors.

journal_name

J Med Genet

authors

Hinttala R,Smeets R,Moilanen JS,Ugalde C,Uusimaa J,Smeitink JA,Majamaa K

doi

10.1136/jmg.2006.042168

subject

Has Abstract

pub_date

2006-11-01 00:00:00

pages

881-6

issue

11

eissn

0022-2593

issn

1468-6244

pii

jmg.2006.042168

journal_volume

43

pub_type

信件
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