绿藻Chlamydomonas reinhardtii中的两个CENH3类型具有冗余的基本功能,并与ZeppL-LINE1元素相关联
Dianyi Liu1, Mingyu Wang2, Jonathan I Gent3
1Donald Danforth Plant Science Center, 975 N. Warson Rd., St. Louis, Missouri, 63132, USA.
The Plant journal : for cell and molecular biology
|April 28, 2025
概括
这项研究特征了克拉米多蒙纳斯的两个CENH3对应物,揭示了它们在中间体功能中的重要作用,并确定了不同隔离物中重要的中间体进化,包括转子子动力学.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 对于染色体分离至关重要的中间体,在表观遗传上是由质子H3变体 (如CENP-A/CENH3.3) 定义的.
- 克拉米多马纳斯有两个未表征的CENH3对应物,CENH3.1和CENH3.2,其在中间体形成和功能中的作用尚不清楚.
研究的目的:
- 描述两个预测的克拉米多马纳斯CENH3对应物,CENH3.1和CENH3.2.2.
- 为了调查CENH3功能在Chlamydomonas中的关键性.
- 分析克拉米多马纳斯的中粒体结构,进化和CENH3结合模式.
主要方法:
- 为CENH3.1,CENH3.2和共享的CENH3表位生成特定的抗体.
- 通过CRISPR-Cas9介导的插入性突变发生,在CENH3.1和CENH3.2.2中产生零突变.
- 基因组测序和克拉米多马纳斯菌株的组装.
- 在目标下切割和标记 (CUT&Tag) 用于绘制CENH3绑定的基因组区域.
主要成果:
- 两种CENH3对应物都被表达并局部化到中间体,这是通过抗体染色证实的.
- 双重突变 (cenh3.1 cenh3.2) 是不可活性的,这表明CENH3的功能是必不可少的.
- 对基因组进行比较分析,发现同类中间体的显著变化,包括转位子 (ZeppL-LINE1) 移动性和退化.
- CENH3 的结合主要发生在中心体区域,除了在染色体2上的一种异构体中显示双结合位的异构体外.
- 克拉米多马纳斯的中间体相对较小,范围从63.5kb到175kb.
结论:
- 克拉米多马纳 CENH3.1 和 CENH3.2 对于中心体功能至关重要.
- 克拉米多马纳斯中的中间体表现出动态进化,受转体子活动的影响.
- 克拉米多马纳斯中间体的小尺寸和特征性质使其成为人工染色体研究的一个有前途的模型.
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