Asymmetric division of Drosophila male germline stem cell shows asymmetric histone distribution.

Asymmetric division of Drosophila male germline stem cell shows asymmetric histone distribution.
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DOI:
10.1126/science.1226028
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发表时间:
2012-11-02
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Chen X
Chen X
中科院分区:
其他
文献类型:
--
作者:
Tran V;Lim C;Xie J;Chen X

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干细胞可以自我更新并产生分化的子细胞。目前尚不清楚这些细胞在不对称分裂过程中是否能维持其表观遗传信息。使用双色方法对果蝇雄性生殖系干细胞(GSC)中的“旧”和“新”组蛋白进行区分标记,研究人员发现,先前存在的标准H3组蛋白被选择性地分离到GSC中,而在DNA复制过程中合并的新合成组蛋白在分化的子细胞中富集。不对称组蛋白分布发生在GSCs中,而不发生在对称分裂的祖细胞中。此外,如果基因操纵GSCs进行对称分裂,这种不对称模式就会丢失。这项研究表明,干细胞在不对称细胞分裂过程中保留了先前存在的典型组蛋白,这可能是维持其独特分子特性的一种机制。
Stem cells can self-renew and generate differentiating daughter cells. It is not known whether these cells maintain their epigenetic information during asymmetric division. Using a dual-color method to differentially label “old” versus “new” histones in Drosophila male germline stem cells (GSC), we show that preexisting canonical H3, but not variant H3.3, histones are selectively segregated to the GSC whereas newly synthesized histones incorporated during DNA replication are enriched in the differentiating daughter cell. The asymmetric histone distribution occurs in GSCs but not in symmetrically dividing progenitor cells. Furthermore, if GSCs are genetically manipulated to divide symmetrically, this asymmetric mode is lost. This work suggests that stem cells retain preexisting canonical histones during asymmetric cell divisions, probably as a mechanism to maintain their unique molecular properties.
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