Journal
DEVELOPMENTAL BIOLOGY
Volume 434, Issue 1, Pages 84-95Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ydbio.2017.11.014
Keywords
Transcriptional silencing; Cell cycle; Differentiation; Germ line; Stem cells; Heterochromatin
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Funding
- NIGMS NIH HHS [R01 GM111779] Funding Source: Medline
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Transcriptional silencing is a conserved process used by embryonic germ cells to repress somatic fate and maintain totipotency and immortality. In Drosophila, this transcriptional silencing is mediated by polar granule component (pgc). Here, we show that in the adult ovary, pgc is required for timely germline stem cell (GSC) differentiation. Pgc is expressed transiently in the immediate GSC daughter (pre-cystoblast), where it mediates a pulse of transcriptional silencing. This transcriptional silencing mediated by pgc indirectly promotes the accumulation of Cyclin B (CycB) and cell cycle progression into late-G2 phase, when the differentiation factor bag of marbles (barn) is expressed. Pgc mediated accumulation of CycB is also required for heterochromatin deposition, which protects the germ line genome against selfish DNA elements. Our results suggest that transient transcriptional silencing in the pre-cystoblast re-programs it away from self-renewal and toward the gamete differentiation program.
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