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寡核苷酸荧光原位杂交技术揭示了家蚕基于端粒的减数分裂配对动态。

Oligopaint DNA FISH reveals telomere-based meiotic pairing dynamics in the silkworm, Bombyx mori.

作者信息

Rosin Leah F, Gil Jose, Drinnenberg Ines A, Lei Elissa P

机构信息

Nuclear Organization and Gene Expression Section; Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America.

Institut Curie, PSL Research University, CNRS, Paris, France; Sorbonne Université, Institut Curie, CNRS, Paris, France.

出版信息

PLoS Genet. 2021 Jul 28;17(7):e1009700. doi: 10.1371/journal.pgen.1009700. eCollection 2021 Jul.

Abstract

Accurate chromosome segregation during meiosis is essential for reproductive success. Yet, many fundamental aspects of meiosis remain unclear, including the mechanisms regulating homolog pairing across species. This gap is partially due to our inability to visualize individual chromosomes during meiosis. Here, we employ Oligopaint FISH to investigate homolog pairing and compaction of meiotic chromosomes and resurrect a classical model system, the silkworm Bombyx mori. Our Oligopaint design combines multiplexed barcoding with secondary oligo labeling for high flexibility and low cost. These studies illustrate that Oligopaints are highly specific in whole-mount gonads and on meiotic squashes. We show that meiotic pairing is robust in both males and females and that pairing can occur through numerous partially paired intermediate structures. We also show that pairing in male meiosis occurs asynchronously and seemingly in a transcription-biased manner. Further, we reveal that meiotic bivalent formation in B. mori males is highly similar to bivalent formation in C. elegans, with both of these pathways ultimately resulting in the pairing of chromosome ends with non-paired ends facing the spindle pole. Additionally, microtubule recruitment in both C. elegans and B. mori is likely dependent on kinetochore proteins but independent of the centromere-specifying histone CENP-A. Finally, using super-resolution microscopy in the female germline, we show that homologous chromosomes remain associated at telomere domains in the absence of chiasma and after breakdown and modification to the synaptonemal complex in pachytene. These studies reveal novel insights into mechanisms of meiotic homolog pairing both with or without recombination.

摘要

减数分裂过程中准确的染色体分离对于生殖成功至关重要。然而,减数分裂的许多基本方面仍不清楚,包括跨物种调节同源染色体配对的机制。这一差距部分是由于我们无法在减数分裂过程中可视化单个染色体。在这里,我们采用寡核苷酸荧光原位杂交(Oligopaint FISH)来研究减数分裂染色体的同源配对和压缩,并复兴了一个经典的模型系统——家蚕(Bombyx mori)。我们的寡核苷酸设计将多重条形码与二级寡核苷酸标记相结合,具有高度的灵活性和低成本。这些研究表明,寡核苷酸在整装性腺和减数分裂压片中具有高度特异性。我们发现,减数分裂配对在雄性和雌性中都很稳健,并且配对可以通过许多部分配对的中间结构发生。我们还表明,雄性减数分裂中的配对是异步发生的,并且似乎是以转录偏向的方式进行。此外,我们揭示了家蚕雄性减数分裂二价体的形成与秀丽隐杆线虫(Caenorhabditis elegans)中二价体的形成高度相似,这两种途径最终都导致染色体末端配对,未配对的末端朝向纺锤极。此外,秀丽隐杆线虫和家蚕中的微管募集可能依赖于动粒蛋白,但独立于指定着丝粒的组蛋白CENP-A。最后,我们在雌性生殖系中使用超分辨率显微镜,表明在没有交叉的情况下以及在粗线期联会复合体分解和修饰后,同源染色体在端粒区域保持关联。这些研究揭示了关于减数分裂同源配对机制的新见解,无论有无重组。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9ddd/8351950/2951e5ddb86c/pgen.1009700.g001.jpg

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