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Title: Proportion of 11778 mutant mitochondrial DNA and clinical expression in a Thai population with Leber hereditary optic neuropathy
Authors: Wanicha L. Chuenkongkaew
Rungnapa Suphavilai
Lookjan Vaeusorn
Nopasak Phasukkijwatana
Patcharee Lertrit
Bhoom Suktitipat
Mahidol University
Faculty of Medicine, Siriraj Hospital, Mahidol University
Keywords: Medicine
Issue Date: 1-Sep-2005
Citation: Journal of Neuro-Ophthalmology. Vol.25, No.3 (2005), 173-175
Abstract: Background: The proportion of mutant mtDNA in blood has been found to correlate with the frequency of visual loss in cases with mtDNA mutations associated with Leber hereditary optic neuropathy (LHON), especially in men. We sought to determine this correlation in a Thai population of LHON. Methods: Densitometric quantification of blood mtDNA with the 11778 LHON mutation in 137 symptomatic cases and their asymptomatic maternal relatives in 30 Asian pedigree families was performed. Asymptomatic maternal relatives under the age of 16 years were excluded. The visual outcome in symptomatic cases with homoplasmy and heteroplasmy was compared. Results: Heteroplasmy was detected in eight (12.9%) symptomatic and 30 (40%) asymptomatic individuals. The quantification of blood mutant mtDNA in the eight symptomatic cases ranged from 44% to 93% (mean = 75%). The visual outcome of the cases with heteroplasmy was not different from that of cases with homoplasmy. There was a correlation between the proportion of mutant mtDNA and the likelihood of visual loss. Conclusions: The prevalence of heteroplasmy among pedigrees of the 11778 LHON mutation in Thailand was similar to that of other Asian populations and may be greater than in 11778 LHON pedigrees from white backgrounds. The proportion of mutated mtDNA correlated with visual loss, but the effect of heteroplasmy on clinical expression seemed not to relate to gender.
ISSN: 10708022
Appears in Collections:Scopus 2001-2005

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