在Hox 5' UTR中的RNA调节子赋予了对基因调节的核糖体特异性
Shifeng Xue1, Siqi Tian2, Kotaro Fujii3
11] Department of Developmental Biology, Stanford University, Stanford, California 94305, USA [2] Department of Genetics, Stanford University, Stanford, California 94305, USA [3] Tetrad Graduate Program, University of California, San Francisco, San Francisco, California 94158, USA.
Nature
|November 20, 2014
概括
研究人员在信使RNA (mRNA) 中发现了新的RNA结构,这些结构通过核糖体控制基因表达. 这些元素在homeobox (Hox) 基因中发现,对于哺乳动物的发育至关重要,并且需要特定的核糖体蛋白来发挥作用.
科学领域:
- 分子生物学分子生物学
- 发展生物学 发展生物学
- 遗传学 是一个遗传学.
背景情况:
- 核糖体在基因表达中起着调节作用,控制空间和时间的mRNA翻译.
- 通过mRNA序列编码核糖体介导的翻译调节的机制尚未完全理解.
研究的目的:
- 在信使RNA (mRNA) 中识别和描述介导核糖体控制基因表达的新型RNA元素.
- 调查这些RNA元素在哺乳动物发育过程中调节homeobox (Hox) 基因表达中的作用.
主要方法:
- 生物信息分析以确定霍克斯基因的5'未翻译区域 (UTR) 中保存的RNA结构.
- 实验验证RNA元素功能的验证,使用记者测试和核糖体分析.
- 调查特定的核糖体蛋白质的需求,如RPL38,对于这些RNA元素的活性.
主要成果:
- 在霍克斯mRNA子集的5'UTR中发现了独特的RNA调节子,类似于内部核糖体进入点 (IRES).
- 这些类似IRES的元素有助于核糖体的招募,其功能依赖于核糖体蛋白RPL38.
- 识别一种新的翻译抑制元件 (TIE),该元件与IRES一起工作,以调节取决于上限的翻译.
- 证明这些IRES元素对于霍克斯蛋白的生产和哺乳动物的体型设计至关重要.
结论:
- 发现了一种在mRNA序列中编码的核糖体中介基因表达控制的新机制.
- 这些发现揭示了一种专门的IRES依赖的翻译模式,对发展过程至关重要.
- 这项研究为理解翻译调节及其对生物发育的影响提出了新的范式.
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