自然甲基化代基因与玉米中的基因表达相关
Yibing Zeng1, R Kelly Dawe1,2, Jonathan I Gent2
1Department of Genetics, University of Georgia, Athens, GA 30602, USA.
Genetics
|August 9, 2023
概括
玉米中的基因体甲基化 (gbM) 与基因表达呈正相关性. 可转移元素类甲基化 (teM) 基因大多是无声的,保存不良,这表明注释错误.
科学领域:
- 植物表观遗传学 植物表观遗传学
- 基因组学就是基因组学.
- 基因表达调节 基因表达调节
背景情况:
- 在植物中,DNA甲基化通常不在cis调节区域,但存在于基因体中.
- 基因体甲基化 (gbM) 发生在CG环境中,而TE类甲基化 (teM) 涉及CG和非CG环境.
- 这些甲基化模式在基因调节中的功能意义仍然难以确定.
研究的目的:
- 研究基因体中的DNA甲基化模式及其与玉米基因表达的关系.
- 区分和描述gbM和teM在玉米基因调节中的作用.
- 利用基因组和转录组数据来完善基因注释和识别潜在的非功能性甲基化基因.
主要方法:
- 利用了玉米基因组组,基因注释和甲基组数据.
- 量化甲基化模式,特别是gbM和teM,在各种玉米库存和组织中.
- 与基因表达数据相关的甲基化水平,以评估功能关联.
主要成果:
- 在gbM基因中观察到CG甲基化水平的连续性,而甲基化和非甲基化基因之间没有明显的界限.
- 在大多数组织中,在gbM和基因表达之间发现了一个弱但显著的正相关性,gbM表达率增加了3%左右.
- 发现teM基因,占基因组的12%,在很大程度上是沉默的,保存不良,并可能有错误的注释.
结论:
- gbM通常与玉米的活性基因表达有关,尽管效应规模适度.
- teM基因主要是非功能性或错误注释的,它们的包含可能会使全基因组分析复杂化.
- 这些发现有助于完善玉米基因注释,并了解DNA甲基化调节作用.
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