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在Mesorhabditis线虫中进行编程DNA清除

Carine Rey¹, Caroline Launay¹, Eva Wenger¹

¹Laboratory of Biology and Modeling of the Cell, Ecole Normale Superieure de Lyon, CNRS UMR5239, Inserm U1293, University Claude Bernard Lyon 1, Lyon, France.

Current biology : CB

|August 22, 2023

概括

在Mesorhabditis线虫中,编程DNA消除 (PDE) 系统地破坏体细胞中的DNA. 这一过程发生在第三个胚胎分裂时,主要是去除重复的DNA序列,而不是必要的基因.

科学领域:

发展生物学发展生物学
遗传学是一个遗传学.
分子生物学分子生物学

背景情况:

编程DNA消除 (PDE) 是一种鲜为人知的现象,在体细胞中,基因组的部分被破坏.
虽然在纤毛动物中已知机制,但由于缺乏合适的模型生物体,动物 (元动物) 中的PDE在很大程度上仍然是神秘的.
线虫属Mesorhabditis与C. elegans密切相关,为研究动物PDE提供了一个实验性可处理的系统.

研究的目的:

描述Mesorhabditis线虫早期胚胎中编程DNA消除的动态和机制.
确定这些线虫中受PDE影响的基因组区域和基因.
调查PDE在美索哈比底炎中的功能意义和进化影响.

主要方法:

早期胚胎细胞分裂的细胞学分析,观察染色体行为.
基因组方法用于识别特定的DNA序列和在发育过程中被消除的基因.
在密切相关的Mesorhabditis物种中消除序列的比较分析.

主要成果:

大规模的PDE发生在体质芽细胞的第三个胚胎细胞分裂.
在S阶段的染色体碎片化之前消除,碎片未能正确分离.
消除的DNA主要由重复区域和一个物种特定的约一百个基因组成.
保留的碎片被稳定为迷你染色体,并在随后的分裂中正确分离.

结论:

甲状腺炎表现出一种独特的动物PDE形式,涉及染色体碎片化和迷你染色体形成.
梅索拉布迪斯中PDE似乎主要作用于不可逆转地去除 soma 中的重复序列.
消除非共享基因表明,PDE不是为调节必要的生物功能而被选择,但可能会准那些体质损失在进化上是看不见的基因.

关键词:

梅索哈比迪斯炎 (Mesorhabditis) 是一种发生在人体中的一种性质.染色体调节染色体调节自由生活的线虫.基因组的重新排列是基因组的重新排列.编程的 DNA 消除.

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