邻近的编码子相邻的核酸对mRNA衰变具有保留的影响
bioRxiv : the preprint server for biology
|December 3, 2025
概括
植物的mRNA稳定性受到子最佳性的影响,类似于酵母. 不仅是tRNA水平,还影响mRNA衰变速率,揭示了一个新的选择机制.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 植物科学 植物科学
背景情况:
- 遗传密码的退化影响了酵母的mRNA稳定性.
- 由tRNA供应和需求定义的codon最佳性,影响mRNA衰变速率.
- 这种机制在植物中的作用和其他影响子最佳性的因素尚未被探索.
研究的目的:
- 为了研究代码子的最佳性是否影响植物的mRNA衰变率.
- 探索超出充电tRNA丰富度的因素,影响子最佳性.
- 为了确定子使用对Arabidopsis.mRNA稳定性的影响程度.
主要方法:
- 与Arabidopsis的mRNA衰变速率相关的偏向性编码子使用.
- 使用同义重编码基因测试一个代码子优化模型.
- 分析转基因植物的mRNA衰变率,并与模型预测进行比较.
- 研究子环境对mRNA衰变的影响.
主要成果:
- 在阿拉比多普西斯中偏差的子使用与mRNA衰变率相关.
- 一个编码子优化模型准确地预测了重编码基因的mRNA衰变率.
- 诺特3基因保留的传感器域表明,对于感知次优代码子的保存机制.
- 子背景,特别是相邻的核酸,影响了mRNA衰变速率,独立于tRNA水平.
结论:
- 频解释了植物中21%的mRNA衰变速率变异.
- 子最佳性介导的衰变是调节植物mRNA稳定性的几个机制之一.
- 子背景是影响mRNA稳定的另一个因素.
- 通过摇摆基配对来解码的同名编码子之间建立了选择范式.
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