2010년 9월 28일 화요일

Accurate and Fast MSA tool may accelerate the discovery of mitochondrial DNA mutations

Does strong hypertrophic condition induce fast mitochondrial
DNA mutation of rabbit heart?




Homo- and heteroplasmic mitochondrial DNA (mtDNA) mutations were observed and identified in an isoproterenol-induced rabbit model of cardiac hypertrophy. Genes encoding proteins essential for catalyzing mitochondrial electron transfer and for generating the proton motive force, such as NADH dehydrogenases (ND2, ND3, ND4, and ND6), cytochrome b, and ATPase 8, showed increased susceptibility for mutation. Specifically, five mutations caused amino acid changes and were located in Complex I and Complex V gene clusters. To our knowledge, this is the first demonstration of a relationship between cardiac hypertrophy induced by a strong sympathetic load and rapid mtDNA mutations.

Ref: T. Kim et al. Mitochondrion 8 (2008) 279.283

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