RNA polymerase II transcription with partially assembled TFIID complexes
Hisler, V.; Bardot, P.; Detilleux, D.; Stierle, M.; Garcia Sanchez, E.; Richard, C.; Hadj Arab, L.; Ehrhard, C.; Morlet, B.; Hadziev, Y.; Jung, M.; Le Gras, S.; Negroni, L.; Mueller, F.; Tora, L.; Vincent, S. D.
Show abstract
The recognition of core promoter sequences by the general transcription factor TFIID is the first step in the process of RNA polymerase II (Pol II) transcription initiation. Metazoan holo-TFIID is composed of the TATA binding protein (TBP) and of 13 TBP associated factors (TAFs). Inducible Taf7 knock out (KO) results in the formation of a Taf7-less TFIID complex, while Taf10 KO leads to serious defects within the TFIID assembly pathway. Either TAF7 or TAF10 depletions correlate with the detected TAF occupancy changes at promoters, and with the distinct phenotype severities observed in mouse embryonic stem cells or mouse embryos. Surprisingly however, under either Taf7 or Taf10 deletion conditions, TBP is still associated to the chromatin, and no major changes are observed in nascent Pol II transcription. Thus, partially assembled TFIID complexes can sustain Pol II transcription initiation, but cannot replace holo-TFIID over several cell divisions and/or development.
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