Epigenetic regulation of stem cell maintenance in the Drosophila testis via the nucleosome-remodeling factor NURF.

Epigenetic regulation of stem cell maintenance in the Drosophila testis via the nucleosome-remodeling factor NURF.
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DOI:
10.1016/j.stem.2010.04.018
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发表时间:
2010-06-04
期刊:
影响因子:
23.9
通讯作者:
Matunis EL
Matunis EL
中科院分区:
医学1区
文献类型:
--
作者:
Cherry CM;Matunis EL

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干细胞的调控依赖于组织特异性转录调节因子和染色质组织的变化,但这些事件在内源性小生境中的协调作用知之甚少。在果蝇睾丸中,局部JAK-STAT信号传导维持生殖系和体干细胞(GSC和囊肿祖细胞,或CPC)在单个小生境中。在这里,我们表明,通过核小体重塑因子(NURF)复合物的表观遗传调节通过正调节JAK-STAT信号传导确保GSC和CPC的维持,从而防止过早分化。相反,在任一谱系的早期分化的子细胞中不需要BDNF。由于三个额外的ATP依赖性染色质重塑(ACF,CHRAC和dMi-2/NuRD)是睾丸中干细胞维持所必需的,因此该生态位内干细胞的表观遗传调控可能主要依赖于ACF。因此,局部信号与完整小生境中的特异性染色质重塑复合物合作,以协调调节一组共同的靶基因,从而防止干细胞过早分化。
Regulation of stem cells depends on both tissue-specific transcriptional regulators and changes in chromatin organization, yet the coordination of these events in endogenous niches is poorly understood. In the Drosophila testis, local JAK-STAT signaling maintains germline and somatic stem cells (GSCs and cyst progenitor cells, or CPCs) in a single niche. Here we show that epigenetic regulation via the nucleosome remodeling factor (NURF) complex ensures GSC and CPC maintenance by positively regulating JAK-STAT signaling, thereby preventing premature differentiation. Conversely, NURF is not required in early differentiating daughter cells of either lineage. Since three additional ATP-dependent chromatin remodelers (ACF, CHRAC, and dMi-2/NuRD) are dispensable for stem cell maintenance in the testis, epigenetic regulation of stem cells within this niche may rely primarily on NURF. Thus, local signals cooperate with specific chromatin remodeling complexes in intact niches to coordinately regulate a common set of target genes to prevent premature stem cell differentiation.
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