在体内对Saccharomyces cerevisiae内部结构进行了全面的分析
Ramya Rangan1, Rui Huang2, Oarteze Hunter3
1Biophysics Program, Stanford University, Stanford, CA, USA.
Nature structural & molecular biology
|June 5, 2025
概括
研究人员可视化了酵母中前传递 RNA (前mRNA) 结构,揭示了广泛的内核折叠,影响基因表达. 这些发现为了解RNA处理和调节提供了新的模型.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生化学
背景情况:
- 预信使RNA (预mRNA) 的二次结构被认为是调节RNA处理的,但体内可视化一直是具有挑战性的.
- 了解这些结构对于破译基因表达调节在转录后水平至关重要.
研究的目的:
- 描述Saccharomyces cerevisiae在整个转录组中的mRNA前结构.
- 研究这些结构在RNA处理和基因表达中的作用.
主要方法:
- 转录组范围的二甲基硫酸盐探测用于绘制前mRNA结构.
- 拼接抑制以丰富低丰度的前mRNA.
- 与植物遗传和突变数据进行交叉验证.
- 多维化学映射和结构组合预测.
- 开发和应用一个高通量功能测试 (VARS-seq).
主要成果:
- 在大多数测量过的内子 (78个中79个) 中确定了二次结构.
- 发现了"拉链茎"",下游茎"和新型长茎的广泛形成,区分了前mRNA和拼接mRNA.
- 证明了内部结构可以在体外独立形成.
- 结构组合预测表明,在Saccharomyces属中保留了结构.
- VARS-seq识别了影响保留的内子水平的结构元素,甚至远离拼接地点.
结论:
- 预mRNA的内部结构很普遍,并且可以独立于结合伙伴形成.
- 这些结构在调节RNA处理,包括内质保留方面发挥着重要作用.
- 这些发现引入了研究前mRNA折叠及其对基因表达的影响的新范式和模型系统.
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