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线粒体基因组拷贝数在小鼠和人类组织中的变化

Sneha P Rath^1,2,3,4, Rahul Gupta^1,2,3,4, Ellen Todres⁴

¹HHMI, Boston, MA 02114.

Proceedings of the National Academy of Sciences of the United States of America

|August 19, 2025

概括

线粒体DNA拷贝数 (mtCN) 在人类和小鼠组织和细胞系之间存在显著差异. 这种变异与蛋白质水平有关,并影响细胞对某些遗传干扰的抵抗力.

科学领域:

基因组学就是基因组学.
分子生物学分子生物学
细胞生物学细胞生物学

背景情况:

哺乳动物线粒体基因组 (mtDNA) 是多重复制的,其复制数 (mtCN) 显示出大量的变化.
这种变异发生在不同的组织中,在发育过程中和疾病状态中,影响细胞功能.
了解mtCN变异的程度和驱动因素对于解释线粒体生物学至关重要.

研究的目的:

在广泛的哺乳动物组织和细胞系中系统地对线粒体DNA拷贝数 (mtCN) 的变异进行分类.
确定与观察到的mtCN变异相关的潜在分子预测因子和功能后果.
为研究线粒体基因组学和功能研究的研究社区创造一个有价值的资源.

主要方法:

量化PCR (qPCR) 用于对52个人类组织 (来自952名捐赠者) 和20个小鼠组织进行mtCN测定.
用全基因组测序数据估计了173个人类癌症细胞系的每细胞mtCN.
蛋白质组学数据和CRISPR基因依赖度测量被整合在一起,以探索与mtCN的关系.

主要成果:

观察到mtCN的显著变化,人类组织的变化是50倍,细胞系的变化>50倍.
由于TFAM,基因组和线粒体核糖体蛋白质的丰富性,mtCN变异是可以预测的.
具有高mtCN的细胞系对GPX4的损失表现出抵抗力,GPX4是一种关键的抗氧化酶.

结论:

这项研究提供了跨哺乳动物组织和细胞系mtCN变异的全面目录.
这些发现突出了mtCN,蛋白质表达和细胞表型 (如耐药性) 之间的联系.
产生的资源为进一步研究mtDNA复制数调节及其生物学影响提供了基础.

关键词:

在GPX4中使用GPX4.在TFAM中,我们可以使用TFAM.基因组基因组基因组线粒体核糖体的线粒体核糖体.我们的mtDNA mtDNA

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