重复元素的进化动态和Tetrigidae (Orthoptera: Caelifera) 的基因组大小
Muhammad Salman1, Ping Wang1, Nian Liu1
1College of Life Sciences, Shaanxi Normal University, Xi'an, China.
Scientific reports
|October 3, 2025
概括
重复性DNA,特别是可转移元素 (TE),驱动着Tetrigidae虫的基因组尺寸扩大. 这些元素,包括LINE和LTR,显示出与更大的基因组和基因组复杂性相关的活动爆发.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 生物信息学是一种生物信息学.
背景情况:
- 重复元素 (RE),包括卫星DNA (satDNA) 和可转移元素 (TE),是基因组进化的关键驱动力.
- 由大型基因组为特征的骨科动物 (Orthoptera) 序列,为研究重复内容和基因组大小之间的联系提供了有价值的模型.
研究的目的:
- 为了在十种Tetrigidae物种中进行比较的重复组分析.
- 为了研究重复性DNA含量,可转移元素活性和Tetrigidae的基因组大小演变之间的关系.
主要方法:
- 使用RepeatExplorer2和dnaPipeTE对低覆盖率的短读数进行比较的重复组分析.
- 使用RepeatMasker进行可转换元素 (TE) 差异分析.
- 卫星分析和祖先状态重建使用线粒体蛋白质编码基因 (PCG) 的化石校准的基因组.
主要成果:
- 重复元素占Tetrigidae基因组的42.82%60.86%,主要是LINE,LTR/Gypsy,LTR/Copia和DNA转位子.
- 在重复和TE含量和基因组大小之间观察到强烈的正相关性,表明TE驱动基因组扩张.
- 具有较大的基因组的物种表现出古老的和最近的TE活动爆发,以及不同的satDNA家族.
结论:
- 重复的DNA,特别是可转移的元素,在塑造Tetrigidae的基因组复杂性和扩张方面发挥着关键作用.
- 揭示了基因组进化的谱系特异性模式,突出显示了重复元素动态的动态性.
- 这项研究为Tetrigidae的基因组大小和重复性DNA的进化动态提供了重要的见解.
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