Defective nucleotide excision repair with normal centrosome structures and functions in the absence of all vertebrate centrins.

Defective nucleotide excision repair with normal centrosome structures and functions in the absence of all vertebrate centrins.
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DOI:
10.1083/jcb.201012093
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发表时间:
2011-04-18
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Morrison CG
Morrison CG
中科院分区:
其他
文献类型:
--
作者:
Dantas TJ;Wang Y;Lalor P;Dockery P;Morrison CG

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无中心蛋白的细胞进行正常分裂,但由于DNA修复受损,对UV照射高度敏感。中心体是动物细胞中主要的微管组织中心,含有中心蛋白,一种真核生物特有的小的保守的钙结合蛋白。存在几种中心蛋白同种型,并参与各种细胞过程,包括核输出和脱氧核糖核酸(DNA)修复。尽管中心蛋白是低等真核生物中心粒/基体复制所必需的,但中心蛋白在脊椎动物中心体复制中的功能尚不清楚。为了定义这些作用,我们在超重组鸡DT 40细胞系中使用基因靶向来删除单个克隆中的所有三个中心蛋白基因。出乎意料的是,缺乏中心蛋白的细胞进行正常的细胞分裂,没有检测到细胞周期缺陷。光学和电子显微镜分析显示,中心体组成或超微结构没有显着差异。然而,centrin缺陷使DT 40细胞对紫外线(UV)照射高度敏感,Cetn 3缺陷加剧了Cetn 4/Cetn 2双突变体的敏感性。DNA损伤检查点是完整的,但修复紫外线诱导的DNA损伤被延迟在中心蛋白空。这些数据证明了脊椎动物中心蛋白在核苷酸切除修复中的作用。
Centrin-null cells undergo normal division but are highly sensitive to UV irradiation as a result of impaired DNA repair. The principal microtubule-organizing center in animal cells, the centrosome, contains centrin, a small, conserved calcium-binding protein unique to eukaryotes. Several centrin isoforms exist and have been implicated in various cellular processes including nuclear export and deoxyribonucleic acid (DNA) repair. Although centrins are required for centriole/basal body duplication in lower eukaryotes, centrin functions in vertebrate centrosome duplication are less clear. To define these roles, we used gene targeting in the hyperrecombinogenic chicken DT40 cell line to delete all three centrin genes in individual clones. Unexpectedly, centrin-deficient cells underwent normal cellular division with no detectable cell cycle defects. Light and electron microscopy analyses revealed no significant difference in centrosome composition or ultrastructure. However, centrin deficiency made DT40 cells highly sensitive to ultraviolet (UV) irradiation, with Cetn3 deficiency exacerbating the sensitivity of Cetn4/Cetn2 double mutants. DNA damage checkpoints were intact, but repair of UV-induced DNA damage was delayed in centrin nulls. These data demonstrate a role for vertebrate centrin in nucleotide excision repair.
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