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直接评估有丝分裂 I 中裂变酵母中黏连蛋白介导的姐妹动粒连接。

Direct evaluation of cohesin-mediated sister kinetochore associations at meiosis I in fission yeast.

机构信息

Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.

Department of Biological Sciences, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.

出版信息

J Cell Sci. 2022 Jan 1;135(1). doi: 10.1242/jcs.259102. Epub 2022 Jan 10.

Abstract

Kinetochores drive chromosome segregation by mediating chromosome interactions with the spindle. In higher eukaryotes, sister kinetochores are separately positioned on opposite sides of sister centromeres during mitosis, but associate with each other during meiosis I. Kinetochore association facilitates the attachment of sister chromatids to the same pole, enabling the segregation of homologous chromosomes toward opposite poles. In the fission yeast, Schizosaccharomyces pombe, Rec8-containing meiotic cohesin is suggested to establish kinetochore associations by mediating cohesion of the centromere cores. However, cohesin-mediated kinetochore associations on intact chromosomes have never been demonstrated directly. In the present study, we describe a novel method for the direct evaluation of kinetochore associations on intact chromosomes in live S. pombe cells, and demonstrate that sister kinetochores and the centromere cores are positioned separately on mitotic chromosomes but associate with each other on meiosis I chromosomes. Furthermore, we demonstrate that kinetochore association depends on meiotic cohesin and the cohesin regulators Moa1 and Mrc1, and requires mating-pheromone signaling for its establishment. These results confirm cohesin-mediated kinetochore association and its regulatory mechanisms, along with the usefulness of the developed method for its analysis. This article has an associated First Person interview with the first author of the paper.

摘要

动粒通过介导染色体与纺锤体的相互作用来驱动染色体分离。在高等真核生物中,姐妹动粒在有丝分裂期间分别位于姐妹着丝粒的相对两侧,但在减数分裂 I 期间相互关联。动粒的关联促进姐妹染色单体与同一极的附着,从而使同源染色体向相反的两极分离。在裂殖酵母 Schizosaccharomyces pombe 中,含有 Rec8 的减数分裂黏合蛋白被认为通过介导着丝粒核心的黏合来建立动粒关联。然而,黏合介导的完整染色体上的动粒关联从未被直接证明过。在本研究中,我们描述了一种在活 S. pombe 细胞中直接评估完整染色体上动粒关联的新方法,并证明姐妹动粒和着丝粒核心在有丝分裂染色体上分别定位,但在减数分裂 I 染色体上相互关联。此外,我们证明动粒的关联依赖于减数分裂黏合蛋白和黏合蛋白调节因子 Moa1 和 Mrc1,并且需要交配信息素来建立其关联。这些结果证实了黏合介导的动粒关联及其调节机制,以及所开发方法用于其分析的有用性。本文附有该论文第一作者的第一人称采访。

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