高静态度的m6A位点在进化过程中得到了保存
Hamish Nc Pike1, Schraga Schwartz2
1Weizmann Institute of Science.
概括
N6-甲基氨酸 (m6A) 修饰部位在功能上很重要,而不是中性副产品. 高甲基化m6A位点显示显著的进化保存,表明净化选择和基因调节中的作用.
科学领域:
- 分子生物学分子生物学
- 进化生物学 进化生物学
- 基因组学就是基因组学.
背景情况:
- N6-甲基氨酸 (m6A) 是真核生物中最丰富的内部mRNA修饰.
- 对于m6A遗址的功能意义和进化性保护仍有争议,之前的研究结果相互矛盾.
研究的目的:
- 为了最终确定m6A地点是否处于进化选择的过程中.
- 为了协调先前对m6A位点的进化分析中不一致的结果.
主要方法:
- 开发新的动机级保护指标,包括m6A生物发生.
- 在447种哺乳动物中使用定量,单核酸分辨率测量对500,000m6A位点的分析.
- 控制外接口的近距离,以隔离m6A地点的选择压力.
主要成果:
- 在编码序列 (CDS) 和未翻译区域 (UTR) 中观察到m6A静态度和进化保存之间的明确,剂量依赖的关系.
- 高甲基化m6A位点 (>60%) 显示显著更大的保护比低甲基化站点.
- 观察到的保护提供了对在m6A位点上起作用的净化选择的最终证据.
结论:
- 高度m6A修饰的位点在基因调节方面具有功能性重要性,挑战了中性副产品的概念.
- 通过使用定量数据和遗传学采样,建立了RNA修饰的进化分析的方法框架.
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