CLINICAL SCIENCE

Increase of mitochondrial DNA in blood cells of patients with Leber’s hereditary optic neuropathy with 11778 mutation

M-Y Yen¹, C-S Chen¹, A-G Wang¹ and Y-H Wei²

¹ Department of Ophthalmology, Taipei Veterans General Hospital, and the Department of Ophthalmology, National Yang-Ming University, Taipei 11217, Taiwan, Republic of China
² Department of Biochemistry and Center for Cellular and Molecular Biology, National Yang-Ming University, Taipei 11217, Taiwan, Republic of China

Correspondence to:
Correspondence to:
May-Yung Yen, Department of Ophthalmology, Taipei Veterans General Hospital, Taipei 11217, Taiwan, Republic of China;
myyen{at}vghtpe.gov.tw

Aims: To investigate the change of mitochondrial DNA (mtDNA) content in Leber’s hereditary optic neuropathy (LHON) with 11778 mutation.

Methods: Mitochondrial DNA content in 27 LHON patients with 11778 mutation, 26 asymptomatic maternal relatives, and 23 normal controls was measured using a competitive polymerase chain reaction (PCR) method.

Results: The mean relative content of mtDNA (with respect to the ß actin gene) in LHON patients, asymptomatic maternal relatives, and normal controls was 245.5 (162.3), 238.2 (118.4), and 156.5 (61.6), respectively. There was a statistically significant difference between patients and controls and between relatives and controls. However, no statistically significant difference between patients and unaffected relatives was found. There was no statistically significant difference in the relative content of mtDNA between all males and females carrying 11778 mtDNA mutation

Conclusion: The results suggest that the increase in mtDNA content in LHON patients with 11778 mtDNA mutation may be due to a compensatory effect for respiratory chain defects of mitochondria. However, the increase of mtDNA content is the result rather than the cause of defective mtDNA. It still cannot explain the pathogenesis of LHON.

Keywords: Leber hereditary optic neuropathy; mitochondrial DNA; polymerase chain reaction; respiratory chain defects

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