The CENP-O complex requirement varies among different cell types.

The CENP-O complex requirement varies among different cell types.
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CENP-O复合物需求在不同的细胞类型之间各不相同。

DOI:
10.1007/s10577-014-9404-1
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发表时间:
2014-09
影响因子:
2.6
通讯作者:
Fukagawa, Tatsuo
Fukagawa, Tatsuo
中科院分区:
生物学2区
文献类型:
--
作者:
Kagawa, Naoko;Hori, Tetsuya;Hoki, Yuko;Hosoya, Osamu;Tsutsui, Kimiko;Saga, Yumiko;Sado, Takashi;Fukagawa, Tatsuo

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CENP-U(CENP-50)是CENP-O复合体的组成部分,包括CENP-O、CENP-P、CENP-Q、CENP-R和CENP-U,在脊椎动物细胞周期中定位于动点。虽然CENP-U缺乏会导致鸡DT40细胞出现一些有丝分裂缺陷,但CENP-U缺陷的鸡DT40细胞是活的。为了研究CENP-U在生物依赖背景下的功能作用,我们产生了CENP-U缺陷小鼠。CENP-U缺陷小鼠在早期胚胎发育过程中死亡(约为e7.5)。因此,我们建立了条件性CENP-U缺陷小鼠ES细胞,在细胞水平上分析CENP-U缺陷的表型。当CENP-U在小鼠ES细胞中被破坏时,所有的CENP-O复合蛋白都从运动中心消失。相反,在CENP-U缺陷的小鼠ES细胞中招募了其他动粒蛋白作为CENP-U缺陷的DT40细胞。然而,CENP-U缺陷的ES细胞在表现出异常的有丝分裂行为后死亡。虽然CENP-U在小鼠早期胚胎发育过程中对细胞活力是必不可少的,但CENP-U缺陷的小鼠胚胎成纤维细胞是存活的,与DT40细胞相似。因此,尽管具有CENP-U缺陷的DT40和ES细胞都有相似的有丝分裂缺陷,但不同类型的细胞对有丝分裂缺陷的反应是不同的。本文的在线版本(doi:10.1007/s10577-0149404-1)包含补充材料,授权用户可以使用。
CENP-U (CENP-50) is a component of the CENP-O complex, which includes CENP-O, CENP-P, CENP-Q, CENP-R, and CENP-U and is constitutively localized at kinetochores throughout the cell cycle in vertebrates. Although CENP-U deficiency results in some mitotic defects in chicken DT40 cells, CENP-U-deficient chicken DT40 cells are viable. To examine the functional roles of CENP-U in an organism-dependent context, we generated CENP-U-deficient mice. The CENP-U-deficient mice died during early embryogenesis (approximately E7.5). Thus, conditional CENP-U-deficient mouse ES cells were generated to analyze CENP-U-deficient phenotypes at the cell level. When CENP-U was disrupted in the mouse ES cells, all CENP-O complex proteins disappeared from kinetochores. In contrast, other kinetochore proteins were recruited in CENP-U-deficient mouse ES cells as CENP-U-deficient DT40 cells. However, the CENP-U-deficient ES cells died after exhibiting abnormal mitotic behavior. Although CENP-U was essential for cell viability during mouse early embryogenesis, CENP-U-deficient mouse embryonic fibroblast cells were viable, similar to the DT40 cells. Thus, although both DT40 and ES cells with CENP-U deficiency have similar mitotic defects, cellular responses to mitotic defects vary among different cell types. The online version of this article (doi:10.1007/s10577-014-9404-1) contains supplementary material, which is available to authorized users.
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