在热和冷应力下,在多倍体Brassica napus中转录异形和替代拼接
Ryan E Bailey1, Keith L Adams1
1Department of Botany, University of British Columbia, 6270 University Blvd., Vancouver, BC V6T 0A2, Canada.
Annals of botany
|October 13, 2025
概括
寒冷和热应激相反地影响Brassica napus homeologues中的替代拼接 (AS). 寒冷压力减少异构体,而热应力增加它们,可能有助于多倍体适应温度变化.
科学领域:
- 植物基因组学和分子生物学
- 多倍体进化和基因表达
- 无生物应激反应机制的反应机制.
背景情况:
- 多化是开花植物基因组进化的主要驱动因素,产生同源基因.
- 替代拼接 (AS) 产生了转录多样性,但其在压力下的多倍体同源体中的作用未得到充分研究.
- 布拉西卡纳普斯 (Brassica napus) 是一种全聚聚类动物,可以作为研究同源转录异形多样性的模型.
研究的目的:
- 为了研究非生物应激 (热和冷) 对布拉西卡纳普斯 (Brassica napus) 的转录异型多样性的影响.
- 描述同源基因 (A和C亚基因组) 对温度压力的差异反应.
- 了解多倍体中的替代拼接如何有助于应激适应.
主要方法:
- 在Brassica napus中使用单分子长读序列的转录异型的全球分析.
- 对植物进行受控的热和冷应激处理的应用.
- 在同源基因对之间对同源形态多样性和替代拼接事件的比较分析.
主要成果:
- 寒冷压力减少了基因异型数量,而热压力增加了它们.
- 热应力增加了替代拼接事件,以及针对无意中介衰变的转录的比例.
- C类同源体表现出比A类同源体更高的异构体产量,压力诱导的异构体分布在同源体对中的变化.
结论:
- 观察到寒冷和热应激对同源转录异形组成的对立作用.
- 跨子基因组的偏斜异形分布突出了差异性同源调节.
- 这些发现表明,因温度应激而改变的异形组成是多倍体适应的关键机制.
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