Waksman Institute and Department of Genetics, Rutgers, The State University of New Jersey, Piscataway, NJ, United States of America.
Essays Biochem. 2020 Sep 4;64(2):251-261. doi: 10.1042/EBC20190080.
While many of the proteins involved in the mitotic centromere and kinetochore are conserved in meiosis, they often gain a novel function due to the unique needs of homolog segregation during meiosis I (MI). CENP-C is a critical component of the centromere for kinetochore assembly in mitosis. Recent work, however, has highlighted the unique features of meiotic CENP-C. Centromere establishment and stability require CENP-C loading at the centromere for CENP-A function. Pre-meiotic loading of proteins necessary for homolog recombination as well as cohesion also rely on CENP-C, as do the main scaffolding components of the kinetochore. Much of this work relies on new technologies that enable in vivo analysis of meiosis like never before. Here, we strive to highlight the unique role of this highly conserved centromere protein that loads on to centromeres prior to M-phase onset, but continues to perform critical functions through chromosome segregation. CENP-C is not merely a structural link between the centromere and the kinetochore, but also a functional one joining the processes of early prophase homolog synapsis to late metaphase kinetochore assembly and signaling.
虽然有许多参与有丝分裂着丝粒和动粒的蛋白质在减数分裂中是保守的,但由于减数分裂 I(MI)中同源体分离的独特需求,它们通常会获得新的功能。CENP-C 是有丝分裂中着丝粒组装的动粒的关键组成部分。然而,最近的工作强调了减数分裂 CENP-C 的独特特征。着丝粒的建立和稳定性需要 CENP-C 在着丝粒上加载 CENP-A 功能。同源重组和着丝粒所需的蛋白质的预减数加载也依赖于 CENP-C,动粒的主要支架成分也是如此。这项工作很大程度上依赖于能够以前所未有的方式对减数分裂进行体内分析的新技术。在这里,我们努力强调这个高度保守的着丝粒蛋白的独特作用,它在 M 期开始前加载到着丝粒上,但通过染色体分离继续发挥关键功能。CENP-C 不仅是着丝粒和动粒之间的结构联系,也是连接早期前期同源体联会到后期中期动粒组装和信号传递过程的功能联系。