Delayed activation of the DNA replication licensing system in Lgr5(+) intestinal stem cells

Delayed activation of the DNA replication licensing system in Lgr5(+) intestinal stem cells
复制标题

Lgr5( )肠道干细胞中DNA复制许可系统的延迟激活

DOI:
10.1101/177477
复制
发表时间:
2017
期刊:
--
影响因子:
--
通讯作者:
Carroll T
Carroll T
中科院分区:
--
文献类型:
--
作者:
Carroll T

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在有丝分裂晚期和G1早期,复制起点通过与MCM 2 -7双六聚体结合而获得复制许可。这标志着增殖命运的承诺。在这里,我们调查如何许可和增殖承诺耦合在小肠上皮。我们开发了一种方法来识别肠腺中含有DNA结合的MCM 2 -7并获得复制许可的细胞。在过渡扩增区顶部的间期细胞不含DNA结合的MCM 2 -7,但仍表达MCM 2 -7蛋白。这表明许可在最终有丝分裂后的终末分化时立即被抑制。引人注目的是,我们发现,在隐窝基底部,尽管表达MCM 2 -7蛋白和Ki 67增殖标记物,但大多数Lgr 5(+)肠干细胞处于未经许可的状态。这种状态,我们称之为“shallow-G 0”,可能允许干细胞容易地被激活以重新进入细胞周期。我们证明,动态的许可制度提供了一种新的手段来评估独特的细胞周期的肠上皮细胞。
During late mitosis and early G1, replication origins are licensed for replication by binding to MCM2-7 double hexamers. This signals proliferative fate commitment. Here, we investigate how licensing and proliferative commitment are coupled in the small-intestinal epithelium. We developed a method for identifying cells in intestinal crypts that contain DNA-bound MCM2-7 and are licensed for replication. Interphase cells at the top of the transit amplifying zone did not contain DNA-bound MCM2-7, but still expressed MCM2-7 protein. This suggests licensing is inhibited immediately at terminal differentiation, after a final mitosis. Strikingly, we found that at the crypt base the majority of Lgr5(+) intestinal stem cells reside in an unlicensed state, despite expressing MCM2-7 protein and the Ki67 proliferation marker. This state, which we call ‘shallow-G0’, might allow stem cells to be easily activated to re-enter the cell cycle. We demonstrate that the dynamics of the licensing system provides a novel means to assess the unique cell-cycle of intestinal epithelial cells.
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