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  • The chromatin remodeler SRCAP promotes self-renewal of intestinal stem cells.

The chromatin remodeler SRCAP promotes self-renewal of intestinal stem cells.

The EMBO journal (2020-05-26)
Buqing Ye, Liuliu Yang, Guomin Qian, Benyu Liu, Xiaoxiao Zhu, Pingping Zhu, Jing Ma, Wei Xie, Huimu Li, Tianku Lu, Yanying Wang, Shuo Wang, Ying Du, Zhimin Wang, Jing Jiang, Jinsong Li, Dongdong Fan, Shu Meng, Jiayi Wu, Yong Tian, Zusen Fan
ABSTRACT

Lgr5+ intestinal stem cells (ISCs) exhibit self-renewal and differentiation features under homeostatic conditions, but the mechanisms controlling Lgr5 + ISC self-renewal remain elusive. Here, we show that the chromatin remodeler SRCAP is highly expressed in mouse intestinal epithelium and ISCs. Srcap deletion impairs both self-renewal of ISCs and intestinal epithelial regeneration. Mechanistically, SRCAP recruits the transcriptional regulator REST to the Prdm16 promoter and induces expression of this transcription factor. By activating PPARδ expression, Prdm16 in turn initiates PPARδ signaling, which sustains ISC stemness. Rest or Prdm16 deficiency abrogates the self-renewal capacity of ISCs as well as intestinal epithelial regeneration. Collectively, these data show that the SRCAP-REST-Prdm16-PPARδ axis is required for self-renewal maintenance of Lgr5 + ISCs.

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