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- W2000540685 abstract "In this report, we investigate molecular pathogenic mechanism of a diabetes-associated homoplasmic mitochondrial tRNA mutation in a Han Chinese family with maternally transmitted diabetes mellitus. Of 10 adult matrilineal relatives, 5 individuals suffered from diabetes (4 subjects with only diabetes, one subject with both diabetes and hearing impairment), while other five matrilineal relatives (one with hearing loss) had glucose intolerance. The average age at onset of diabetes in matrilineal relatives was 50 years. Molecular analysis of their mitochondrial genomes identified the novel homoplasmic T10003C mutation in the tRNA(Gly) gene belonging to haplogroup M11b. The T10003C mutation is expected to form a base-pairing (13C-22G) at the highly conserved D-stem of tRNA(Gly), thereby affecting secondary structure and function of this tRNA. A tRNA Northern analysis revealed that the T10003C mutation caused ~70% reduction in the steady-state level of tRNA(Gly). An in vivo translation analysis showed ~33% reduction in the rate of mitochondrial translation in mutant cells. Oxygen consumption analysis showed the defects in overall respiratory capacity or the ATP-linked, proton leak, and maximal respiration in mutant cells. As a result, the cellular energy deficiency contributes to the development of diabetes in subjects carrying the T10003C mutation. These data provide the first direct evidence that the tRNA(Gly) mutation might be associated with diabetes. Thus, our findings may provide new insights into the understanding of pathophysiology of maternally inherited diabetes." @default.
- W2000540685 created "2016-06-24" @default.
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- W2000540685 date "2015-03-01" @default.
- W2000540685 modified "2023-10-16" @default.
- W2000540685 title "Maternally inherited diabetes is associated with a homoplasmic T10003C mutation in the mitochondrial tRNAGly gene" @default.
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- W2000540685 doi "https://doi.org/10.1016/j.mito.2015.01.004" @default.
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