Journal
GENES
Volume 12, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/genes12030363
Keywords
germline stem cell; Drosophila ovary; escort cell; differentiation niche; decapentaplegic; engrailed; SWI; SNF; osa
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Funding
- National Key Research and Development Program of China [2019YFA0802001, 2017YFA0103601]
- National Natural Science foundation of China [31530043, 31625017, 31670106, 31872627, 31470223]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB19000000]
- Shanghai Leading Talents Program. National Key R&D Program of China [YS2020YFA090044]
- Shanghai Jiao Tong University Scientific and Technological Innovation Fund
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The study reveals that Osa plays a crucial role in controlling escort cell characteristics and germline differentiation in the Drosophila ovary. Depletion of Osa in escort cells results in a blockage of GSC progeny differentiation, partly due to elevated dpp transcription and ectopic En expression in Osa-depleted ECs. Additionally, Osa is shown to regulate germline differentiation in a Brahma-associated protein complex-dependent manner.
The Drosophila ovary is recognized as a powerful model to study stem cell self-renewal and differentiation. Decapentaplegic (Dpp) is secreted from the germline stem cell (GSC) niche to activate Bone Morphogenic Protein (BMP) signaling in GSCs for their self-renewal and is restricted in the differentiation niche for daughter cell differentiation. Here, we report that Switch/sucrose non-fermentable (SWI/SNF) component Osa depletion in escort cells (ECs) results in a blockage of GSC progeny differentiation. Further molecular and genetic analyses suggest that the defective germline differentiation is partially attributed to the elevated dpp transcription in ECs. Moreover, ectopic Engrailed (En) expression in osa-depleted ECs partially contributes to upregulated dpp transcription. Furthermore, we show that Osa regulates germline differentiation in a Brahma (Brm)-associated protein (BAP)-complex-dependent manner. Additionally, the loss of EC long cellular processes upon osa depletion may also partly contribute to the germline differentiation defect. Taken together, these data suggest that the epigenetic factor Osa plays an important role in controlling EC characteristics and germline lineage differentiation.
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