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锌指蛋白16/早幼粒细胞白血病锌指蛋白通过广泛的转录因子预置网络调节幼年精原干细胞发育。

ZBTB16/PLZF regulates juvenile spermatogonial stem cell development through an extensive transcription factor poising network.

作者信息

Yi Chongil, Kitamura Yuka, Maezawa So, Namekawa Satoshi H, Cairns Bradley R

机构信息

Howard Hughes Medical Institute, Huntsman Cancer Institute, Department of Oncological Sciences, University of Utah School of Medicine, Salt Lake City, UT, USA.

Department of Microbiology and Molecular Genetics, University of California, Davis, CA, USA.

出版信息

Nat Struct Mol Biol. 2025 Mar 3. doi: 10.1038/s41594-025-01509-5.

Abstract

Spermatogonial stem cells balance self-renewal with differentiation and spermatogenesis to ensure continuous sperm production. Here, we identify roles for the transcription factor zinc finger and BTB domain-containing protein 16 (ZBTB16; also known as promyelocytic leukemia zinc finger (PLZF)) in juvenile mouse undifferentiated spermatogonia (uSPG) in promoting self-renewal and cell-cycle progression to maintain uSPG and transit-amplifying states. Notably, ZBTB16, Spalt-like transcription factor 4 (SALL4) and SRY-box transcription factor 3 (SOX3) colocalize at over 12,000 promoters regulating uSPG and meiosis. These regions largely share broad histone 3 methylation and acetylation (H3K4me3 and H3K27ac), DNA hypomethylation, RNA polymerase II (RNAPol2) and often CCCTC-binding factor (CTCF). Hi-C analyses show robust three-dimensional physical interactions among these cobound promoters, suggesting the existence of a transcription factor and higher-order active chromatin interaction network within uSPG that poises meiotic promoters for subsequent activation. Conversely, these factors do not notably occupy germline-specific promoters driving spermiogenesis, which instead lack promoter-promoter physical interactions and bear DNA hypermethylation, even when active. Overall, ZBTB16 promotes uSPG cell-cycle progression and colocalizes with SALL4, SOX3, CTCF and RNAPol2 to help establish an extensive and interactive chromatin poising network.

摘要

精原干细胞在自我更新与分化及精子发生之间保持平衡,以确保精子的持续产生。在此,我们确定了转录因子锌指和含BTB结构域蛋白16(ZBTB16;也称为早幼粒细胞白血病锌指蛋白(PLZF))在幼年小鼠未分化精原细胞(uSPG)中促进自我更新和细胞周期进程以维持uSPG及过渡放大状态的作用。值得注意的是,ZBTB16、类Spalt转录因子4(SALL4)和SRY盒转录因子3(SOX3)共定位于超过12,000个调控uSPG和减数分裂的启动子上。这些区域在很大程度上共享广泛的组蛋白3甲基化和乙酰化(H3K4me3和H3K27ac)、DNA低甲基化、RNA聚合酶II(RNAPol2),并且常常有CCCTC结合因子(CTCF)。Hi-C分析显示这些共结合启动子之间存在强大的三维物理相互作用,表明在uSPG内存在一个转录因子和高阶活性染色质相互作用网络,该网络使减数分裂启动子做好后续激活的准备。相反,这些因子在驱动精子形成的种系特异性启动子上没有明显占据,这些启动子反而缺乏启动子 - 启动子物理相互作用并且即使在活跃时也存在DNA高甲基化。总体而言,ZBTB16促进uSPG细胞周期进程,并与SALL4、SOX3、CTCF和RNAPol2共定位,以帮助建立一个广泛且相互作用的染色质准备网络。

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