线粒体糖尿病与ND4G11696A突变有关
Yu Ding1, Shunrong Zhang2, Qinxian Guo1
1Central Laboratory, Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China.
在ND4基因和相关tRNA中的线粒体DNA突变与2型糖尿病 (T2DM) 有关. 这些突变损害了线粒体功能,增加了氧化应激,并影响了受影响家庭的细胞能量生产.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 内分泌学 在内分泌学.
背景情况:
- 2型糖尿病 (T2DM) 是一种复杂的内分泌疾病,其致病因子包括线粒体功能障碍.
- 将线粒体功能障碍与T2DM联系在一起的精确分子机制仍然不完全理解.
研究的目的:
- 调查线粒体DNA (mtDNA) 突变在汉族中华家庭中母性遗传T2DM中的作用.
- 阐明确定mtDNA突变对T2DM相关的细胞过程的功能后果.
主要方法:
- 临床,遗传,分子和生物化学分析两家汉族中国家庭的T2DM.
- 线粒体基因组测序,遗传学分析,以及对突变致病性的生物信息评估.
- 细胞测试测量反应性氧物种 (ROS),线粒体膜潜力 (MMP),ATP水平,mtDNA复制数 (mtDNA-CN),复合I活性和NAD+/NADH比率.
主要成果:
- 鉴定了异质体ND4 G11696A突变,导致氨基酸替代 (Ile312Val),仅在受影响家庭的母系.
- 检测到tRNAAla中的同时发生的突变m.C5601T和tRNACys中的新型m.T5813C,它们是进化保守的.
- 具有这些突变的细胞表现出增加的ROS产量和减少的MMP,ATP,mtDNA-CN,复合I活性和NAD+/NADH比率,表明线粒体功能受损.
结论:
- 潜在由tRNA突变调节的ND4 G11696A突变有助于线粒体功能障碍,并与T2DM相关.
- 这项研究扩大了已知的m.G11696A突变的临床谱,并突出了线粒体遗传学在T2DM病因学中的作用.
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