在Saccharomyces cerevisiae中,随机插入50个基序列到一个内子中的拼接的影响
Molly Perchlik1, Alexander Sasse2, Sara Mostafavi2
1Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA.
概括
研究酵母中的内子拼接发现,大多数随机序列显著降低了基因表达效率. 内部复杂的RNA结构可能会阻碍拼接,这表明特定的序列要求.
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:
- 内核拼接对于真核生物的基因表达至关重要.
- 酵母中已知关键的拼接元素,但由于有限的内核数量,其他内核特征仍然不太清楚.
研究的目的:
- 为了研究随机内基序列对Saccharomyces cerevisiae的拼接效率的影响.
- 为了确定影响拼接调节的内子内的序列和结构特征.
主要方法:
- 一个随机的50核酸 (N50) 元素库被插入到酵母中的记者基因的内子中.
- 使用测序分析量化了法典拼接和密码拼接位置的使用情况.
主要成果:
- 在约14万个N50元件中,超过70%的N50元件将拼接效率降低了至少20%.
- 更高的GC含量,GU重复,更强的预测mRNA前二次结构与减少拼接相关.
- 可能涉及GU重复的RNA结构形成是减少拼接效率的可能原因.
结论:
- 很大一部分随机内部序列对酵母菌的拼接效率产生了负面影响.
- 复杂的,RNA结构中的非线性相互作用可能无法完全被当前的预测方法所捕获.
- 内部序列的耐受性可能取决于上下文,受特定的mRNA前序列的影响,以避免损害拼接的结构.
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