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更高阶的重复结构反映了玉米中间体和旋的不同进化路径
Rebecca D Piri1, Mingyu Wang1, M Cinta Romay2
1Institute of Bioinformatics, University of Georgia, Athens, GA, 30602, USA.
Genome biology
|February 14, 2026
概括
高级重复 (HOR) 在玉米卫星DNA中很常见. 虽然与中间体功能无关,但旋中保存的HOR模式可能会驱动介质驱动,影响基因组进化.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 植物科学 植物科学
背景情况:
- 卫星DNA的特点是重复的串联阵列,集中在像中心体这样的低重组基因组区域.
- 这些卫星阵列可以具有称为高阶重复 (HOR) 的复杂结构,可能会影响它们的功能.
- 玉米表现出独特的卫星DNA分布,无论是在中间体 (与kinetochore蛋白相互作用) 和旋 (参与介质驱动) 中.
研究的目的:
- 调查玉米中间体和旋中高阶重复 (HOR) 的存在和特征.
- 为了确定特定的HOR模式是否与玉米中间体和旋的功能有关.
- 了解HORs在玉米基因组进化和介质驱动中的潜在作用.
主要方法:
- 产生的13个重复敏感基因组组合玉米和teosinte.
- 开发和应用基于图形的新型管道 (HiReNET) 用于HOR分类.
- 使用基因组组件和功能标记器,分析中心和旋区域的HOR分布.
主要成果:
- HORs在玉米卫星DNA中广泛存在,但通常以低频,小的模式出现,与人类中位粒体中的大块不同.
- 大约38%的中心体CentC单体是HOR的一部分,没有单一的HOR类主导功能中心体.
- 玉米旋显示了更有组织的HOR分布,大旋包含了兆基尺度的相似性块和重复的HOR模式,可能会驱动介质驱动.
结论:
- 在所有主要的玉米卫星阵列中存在高阶重复 (HOR).
- 没有特定的HOR与中间体功能相关;然而,在旋相似性块内保留的HOR模式可能会促进介质驱动.
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