塑基因组的前所未有的变异模式以及在Poales中的适应性进化中的潜在作用
Hong Wu1,2, De-Zhu Li3,4, Peng-Fei Ma5,6
1Germplasm Bank of Wild Species and Yunnan Key Laboratory of Crop Wild Relatives Omics, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, Yunnan, China.
BMC biology
|April 28, 2024
概括
池植物表现出显著的塑基因组 (质体) 变异,包括大尺寸,基因变化和重新排列. 这种多样性可能会推动它们适应各种息地和光合作用途径.
科学领域:
- 植物基因组学 植物基因组学
- 进化生物学是进化的生物学.
- 分子遗传学 分子遗传学
背景情况:
- 塑体是植物细胞中必不可少的光合作用器官,具有通常保存的基因组 (塑体).
- ,一个重要的血管苗类群体,以实质性的塑体变异而闻名.
研究的目的:
- 为了研究在Poales序列内的塑体变异的程度和进化模式.
- 了解塑体变异和北极动物多样化之间的关系.
主要方法:
- 获取和分析了93个波拉动物的塑体,涵盖了所有16个家族和5个主要类.
- 比较基因组学以确定大小变异,GC含量,基因重复/损失和结构重组.
- 对重复结构,反向重复 (IR) 和序列替换率的分析.
主要成果:
- 观察到广泛的塑体变异,包括最大的单体塑体 (225,293 bp),异构的GC含量,以及众多的基因重复和损失.
- 很少出现三张IR副本和一个IR损失,以及短的IR和小的直接重复.
- 广泛的结构异质体,逆转和基因组重组,通常与广泛的重复相关.
- 在波拉斯进化过程中,变化和序列替换率的"小大中等"趋势.
- 在C4谱系中发现了积极选择,在经历基因丢失的谱系中放松净化选择.
结论:
- 极地动物的质体变异与成功地多样化到不同的息地和光合作用途径的过渡有关.
- 顺序尺度分析揭示了北极动物塑体的独特进化场景.
- 提供了对血管精子之间塑体进化的新见解.
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