期刊
DEVELOPMENT
卷 140, 期 5, 页码 1014-1023出版社
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/dev.089433
关键词
Germline; Cyst stem cell; Niche; Epigenetics; Histone demethylase; Drosophila
资金
- National Institutes of Health
- National Cancer Institute [F31CA165781]
- National Institute of General Medical Sciences Training Grant [T32 GM007231]
- National Institute of Child Health and Human Development [R01HD065816]
- David and Lucile Packard Foundation
- Johns Hopkins University
Adult stem cells reside in microenvironments called niches, where they are regulated by both extrinsic cues, such as signaling from neighboring cells, and intrinsic factors, such as chromatin structure. Here we report that in the Drosophila testis niche an H3K27me3-specific histone demethylase encoded by Ubiquitously transcribed tetratricopeptide repeat gene on the X chromosome (dUTX) maintains active transcription of the Suppressor of cytokine signaling at 36E (Socs36E) gene by removing the repressive H3K27me3 modification near its transcription start site. Socs36E encodes an inhibitor of the Janus kinase signal transducer and activator of transcription (JAK-STAT) signaling pathway. Whereas much is known about niche-to-stem cell signaling, such as the JAK-STAT signaling that is crucial for stem cell identity and activity, comparatively little is known about signaling from stem cells to the niche. Our results reveal that stem cells send feedback to niche cells to maintain the proper gene expression and architecture of the niche. We found that dUTX acts in cyst stem cells to maintain gene expression in hub cells through activating Socs36E transcription and preventing hyperactivation of JAK-STAT signaling. dUTX also acts in germline stem cells to maintain hub structure through regulating DE-Cadherin levels. Therefore, our findings provide new insights into how an epigenetic factor regulates crosstalk among different cell types within an endogenous stem cell niche, and shed light on the biological functions of a histone demethylase in vivo.
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