Pseudococcus viburni 的 B 染色体:一个自私的染色体,利用整个基因组的 meiotic 驱动
Isabelle M Vea1,2, Andrés G de la Filia2, Kamil S Jaron3
1Department of Biological Sciences, University of Illinois at Chicago, Chicago, Illinois, USA.
Genome biology and evolution
|January 29, 2025
概括
虫在雄性半变化过程中消除了父性染色体,但B染色体通过逃避这一过程而驱动. 基因表达分析显示,B染色体上的特定乙转移酶可能促进这种介质驱动.
科学领域:
- 生殖遗传学 生殖遗传学
- 进化生物学是进化的生物学.
- 基因组学就是基因组学.
背景情况:
- 半月变异通常可以确保染色体分布均 (50%的几率).
- 异常的化可以导致染色体的不平等遗传.
- 这种系统的进化,特别是染色体淘汰和介质驱动的进化,仍然不太了解.
研究的目的:
- 调查虫独特的繁殖遗传学,特别是男性半转化期间的父基因组消除.
- 描述 Pseudococcus viburni 中的 B 染色体及其在通过逃脱排泄来驱动的作用.
- 识别B链基因及其表达模式,特别是那些参与介质驱动的基因.
主要方法:
- 全基因组测序和对有B染色体和没有B染色体的虫菌株的基因表达分析.
- 识别B链序列,包括蛋白质编码基因和卫星重复.
- 对基因对应物和涉及B染色体的染色体重排 (转位) 的分析.
主要成果:
- 确定了B链接序列,包括204个蛋白质编码基因和一个重要的卫星重复.
- 最近发现了373 kb的转位区域,其中包含B染色体上的146个基因.
- 发现虽然许多与B相关的基因在半衰期表达,但只有少数B独有的基因在半衰期过度表达,其中一个乙转移酶 (H3K56Ac) 在男性半衰期过度表达.
结论:
- 伪球菌viburni的B染色体通过逃避父亲基因组清除来驱动.
- 在B染色体上,一个最近转移的区域包含了大部分通过介质表达的基因.
- 在B染色体上过度表达的乙转移酶是介导介质驱动的一个有希望的候选人.
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