Suppr超能文献

减数分裂前期同源染色体的联会。

Premeiotic pairing of homologous chromosomes during male meiosis.

机构信息

Center for Interdisciplinary Research in Biology, CNRS UMR 7241, INSERM U1050, Collège de France and Paris Sciences & Lettres Research University, 75231 Paris Cedex 05, France.

Institut Jacques Monod, CNRS UMR7592, 75013 Paris, France.

出版信息

Proc Natl Acad Sci U S A. 2022 Nov 22;119(47):e2207660119. doi: 10.1073/pnas.2207660119. Epub 2022 Nov 14.

Abstract

In the early stages of meiosis, maternal and paternal chromosomes pair with their homologous partner and recombine to ensure exchange of genetic information and proper segregation. These events can vary drastically between species and between males and females of the same species. In in contrast to females, males do not form synaptonemal complexes (SCs), do not recombine, and have no crossing over; yet, males are able to segregate their chromosomes properly. Here, we investigated the early steps of homolog pairing in males. We found that homolog centromeres are not paired in germline stem cells (GSCs) and become paired in the mitotic region before meiotic entry, similarly to females. Surprisingly, male germline cells express SC proteins, which localize to centromeres and promote pairing. We further found that the SUN/KASH (LINC) complex and microtubules are required for homolog pairing as in females. Chromosome movements in males, however, are much slower than in females and we demonstrate that this slow dynamic is compensated in males by having longer cell cycles. In agreement, slowing down cell cycles was sufficient to rescue pairing-defective mutants in female meiosis. Our results demonstrate that although meiosis differs significantly between males and females, sex-specific cell cycle kinetics integrate similar molecular mechanisms to achieve proper centromere pairing.

摘要

在减数分裂的早期阶段,母源和父源染色体与同源伴侣配对并重组,以确保遗传信息的交换和正确的分离。这些事件在不同物种之间以及同一物种的雄性和雌性之间差异很大。与雌性不同,雄性不会形成联会复合体(SCs),不进行重组,也没有交叉互换;然而,雄性能够正确分离其染色体。在这里,我们研究了雄性同源配对的早期步骤。我们发现同源着丝粒在生殖干细胞(GSCs)中没有配对,而是在进入减数分裂前的有丝分裂区域中配对,这与雌性相似。令人惊讶的是,雄性生殖细胞表达 SC 蛋白,这些蛋白定位于着丝粒并促进配对。我们进一步发现,SUN/KASH(LINC)复合物和微管对于同源配对是必需的,这与雌性相同。然而,雄性染色体的运动速度比雌性慢得多,我们证明这种缓慢的动态在雄性中通过更长的细胞周期得到补偿。一致地,减缓细胞周期足以挽救雌性减数分裂中配对缺陷的突变体。我们的结果表明,尽管雄性和雌性的减数分裂有很大的不同,但特定于性别的细胞周期动力学整合了相似的分子机制,以实现正确的着丝粒配对。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3f23/9704699/365a49ce81fb/pnas.2207660119fig01.jpg

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验