Journal
MOLECULAR CELL
Volume 51, Issue 4, Pages 480-492Publisher
CELL PRESS
DOI: 10.1016/j.molcel.2013.08.009
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Funding
- Howard Hughes Medical Institute Funding Source: Medline
- NCI NIH HHS [R37 CA025417] Funding Source: Medline
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To bridge the gap between in vivo and in vitro molecular mechanisms, we dissected the transcriptional control of the endogenous histone gene cluster (His-C) by single-cell imaging. A combination of quantitative imnnunofluorescence, RNA FISH, and FRAP measurements revealed atypical promoter recognition complexes and differential transcription kinetics directing histone Hi versus core histone gene expression. While H1 is transcribed throughout S phase, core histones are only transcribed in a short pulse during early S phase. Surprisingly, no TFIIB or TFIID was detectable or functionally required at the initiation complexes of these promoters. Instead, a highly stable, preloaded TBP/TFIIA pioneer complex primes the rapid initiation of His-C transcription during early S phase. These results provide mechanistic insights for the role of gene-specific core promoter factors and implications for cell cycle-regulated gene expression.
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