大脑-身体线粒体分布模式缺乏连贯性,并指向组织特异和个性化的调节机制
Jack Devine1, Anna S Monzel1, David Shire1
1Division of Behavioral Medicine, Department of Psychiatry, Columbia University Irving Medical Center, New York, NY, USA.
bioRxiv : the preprint server for biology
|September 30, 2024
概括
线粒体的能量容量在整个身体中不均. 这项研究表明,在某种组织中高的线粒体氧化酸化 (OxPhos) 不能预测其他组织的容量,这挑战了以前的假设.
科学领域:
- 线粒体生物学 线粒体生物学
- 人类生理学 人类生理学
- 基因组学就是基因组学.
背景情况:
- 个人能量转换能力通常被认为是一个一致的特征.
- 这意味着所有器官系统的线粒体氧化酸化 (OxPhos) 能力均.
- 遗传和环境因素被认为是推动这种假定的连贯性.
研究的目的:
- 为了研究在不同组织中一致的线粒体OxPhos容量的假设.
- 分析小鼠和人类多组织的分子和酶活性.
- 探索线粒体基因表达和DNA复制数在各种人体组织中的相关结构.
主要方法:
- 分析线粒体的氧化酸化能力和多达22只小鼠组织的mtDNA密度.
- 在45个人类组织 (GTEx数据集) 中对线粒体基因表达的基于RNA测序的分析.
- 在各个器官和组织中评估线粒体DNA拷贝数 (mtDNAcn).
主要成果:
- 线粒体OxPhos容量和mtDNA密度在小鼠组织之间没有显著的相关性.
- 人类线粒体基因表达表现出有限的连贯性,主要是在大脑区域内,而不是跨大脑-身体对.
- 此外,mtDNAcn在不同器官和组织中缺乏一致性.
结论:
- 线粒体容量是组织特异性的,而不是一个全球连贯的特征.
- 组织特定的能量传感途径 (例如,PGC-1,ISR) 和增殖活动影响线粒体基因表达.
- 奇异的线粒体分布模式有助于个体的表型多样性.
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