远程前体元素可以调节RNA诱导沉默的Arabidopsis中的miR168的复合加载效率
Ágnes Dalmadi1,2, Fabio Miloro1,2, Auwalu Abdu1,2
1Hungarian University of Agriculture and Life Sciences, Institute of Genetics and Biotechnology, Páter Károly Street 1, Gödöllő, H-2100, Hungary.
The Plant journal : for cell and molecular biology
|May 13, 2025
概括
植物微RNA (miRNA) 对于发育至关重要. 它们的前体结构,超出双重区域,影响ARGONAUTE 1 (AGO1) 的加载效率,影响基因沉默和植物发育.
科学领域:
- 分子生物学分子生物学
- 植物科学 植物科学
- 遗传学 遗传学 是一个
背景情况:
- 微RNAs (miRNAs) 通过RNA诱导沉默复合体 (RISC) 在转录后调节基因表达.
- miRNA生物生成涉及将发针前体加工为miRNA/miRNA*复合体,然后将成熟的miRNA加载到AGO蛋白中.
- 在有效的基因沉默中,miRNA加载到AGO蛋白质的效率至关重要.
研究的目的:
- 调查miRNA前体结构元素在miRNA/miRNA*双重体之外的作用,影响ARGONAUTE (AGO) 的加载效率.
- 确定前体结构的修改是否可以改变miRNA活性和对植物发育的下游影响.
主要方法:
- 在植物中进行过渡性和转基因表达研究.
- 通过结合不同MIRNA基因的元素 (例如MIR168和hvu-MIR171) 来构建嵌合式miRNA前体.
- 对AGO加载效率和目标基因下调的分析.
主要成果:
- 在miRNA前体内非双重结构元素显著影响AGO加载效率.
- 一个含有hvu-MIR171干区域的仿真MIR168前体增强了miR168的AGO载荷,导致目标抑制和发育缺陷的增加.
- 在嵌合体前体中逆转双重方向放大了观察到的效果,表明结构元素的合作作用.
- 在短暂测定中,MIR168前体元素被证明可以降低miR171的AGO载荷效率.
结论:
- 米RNA前体的远程结构特征含有调节米RNA生物发生和AGO加载的信号.
- 这些发现表明miRNA生物发生和核中的AGO载荷过程中存在更集成的空间和信号机制.
- 对于特定应用,miRNA前体的结构决定因素为设计miRNA活动提供了潜在的目标.
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