Journal
CELL
Volume 127, Issue 6, Pages 1209-1221Publisher
CELL PRESS
DOI: 10.1016/j.cell.2006.10.039
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Funding
- NCI NIH HHS [P01 CA050507, 5P01CA50507] Funding Source: Medline
- NHLBI NIH HHS [T32 HL007780, T32-HL07780] Funding Source: Medline
- NIGMS NIH HHS [R01 GM050231, 1R01GM075141, 2R01GM50231, R01 GM075141, R01 GM050231-09A2] Funding Source: Medline
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Much of the genome is transcribed into long noncoding RNAs (ncRNAs). Previous data suggested that bithoraxoid (bxd) ncRNAs of the Drosophila bithorax complex (BX-C) prevent silencing of Ultrabithorax (Ubx) and recruit activating proteins of the trithorax group (trxG) to their maintenance elements (MEs). We found that, surprisingly, Ubx and several bxd ncRNAs are expressed in nonoverlapping patterns in both embryos and imaginal discs, suggesting that transcription of these ncRNAs is associated with repression, not activation, of Ubx. Our data rule out siRNA or miRNA-based mechanisms for repression by bxd ncRNAs. Rather, ncRNA transcription itself, acting in cis, represses Ubx. The Trithorax complex TAC1 binds the Ubx coding region in nuclei expressing Ubx, and the bxd region in nuclei not expressing Ubx. We propose that TAC1 promotes the mosaic pattern of Ubx expression by facilitating transcriptional elongation of bxd ncRNAs, which represses Ubx transcription.
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