PLK1- and PLK4-Mediated Asymmetric Mitotic Centrosome Size and Positioning in the Early Zebrafish Embryo.
PLK1- and PLK4-Mediated Asymmetric Mitotic Centrosome Size and Positioning in the Early Zebrafish Embryo.
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DOI:
10.1016/j.cub.2020.08.074
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发表时间:
2020-11-16
期刊:
影响因子:
--
通讯作者:
Hehnly H
中科院分区:
文献类型:
--
作者:
Rathbun LI;Aljiboury AA;Bai X;Hall NA;Manikas J;Amack JD;Bembenek JN;Hehnly H
Factors that regulate mitotic spindle positioning remain unclear within the confines of extremely large embryonic cells, such as the early divisions of the vertebrate embryo, Danio rerio (zebrafish). We find that the mitotic centrosome, a structure that assembles the mitotic spindle, is notably large in the zebrafish embryo (246.44±11.93µm2 in a 126.86±0.35µm diameter cell) compared to a C. elegans embryo (5.78±0.18µm2 in a 55.83±1.04µm diameter cell). During embryonic cell divisions, cell size changes rapidly in both C. elegans and zebrafish, where mitotic centrosome area scales more closely with changes in cell size compared to changes in spindle length. Embryonic zebrafish spindles contain asymmetrically sized mitotic centrosomes (2.14±0.13-fold difference between the two), with the larger mitotic centrosome placed towards the embryo center in a Polo-Like Kinase (PLK) 1 and PLK4 dependent manner. We propose a model in which uniquely large zebrafish embryonic centrosomes direct spindle placement within disproportionately large cells. During embryonic cell divisions cell size changes rapidly. Rathbun et al. identify in zebrafish embryos that mitotic centrosomes scale with changes in cell size. In addition, an embryonic cell spindle has asymmetric in size mitotic centrosomes, where the largest mitotic centrosome is placed towards the embryo center in a PLK1/4 dependent manner.
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