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2016 ; 30
(15
): 1731-46
Nephropedia Template TP
gab.com Text
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Transcription factors GAF and HSF act at distinct regulatory steps to modulate
stress-induced gene activation
#MMPMID27492368
Duarte FM
; Fuda NJ
; Mahat DB
; Core LJ
; Guertin MJ
; Lis JT
Genes Dev
2016[Aug]; 30
(15
): 1731-46
PMID27492368
show ga
The coordinated regulation of gene expression at the transcriptional level is
fundamental to development and homeostasis. Inducible systems are invaluable when
studying transcription because the regulatory process can be triggered
instantaneously, allowing the tracking of ordered mechanistic events. Here, we
use precision run-on sequencing (PRO-seq) to examine the genome-wide heat shock
(HS) response in Drosophila and the function of two key transcription factors on
the immediate transcription activation or repression of all genes regulated by
HS. We identify the primary HS response genes and the rate-limiting steps in the
transcription cycle that GAGA-associated factor (GAF) and HS factor (HSF)
regulate. We demonstrate that GAF acts upstream of promoter-proximally paused RNA
polymerase II (Pol II) formation (likely at the step of chromatin opening) and
that GAF-facilitated Pol II pausing is critical for HS activation. In contrast,
HSF is dispensable for establishing or maintaining Pol II pausing but is critical
for the release of paused Pol II into the gene body at a subset of highly
activated genes. Additionally, HSF has no detectable role in the rapid HS
repression of thousands of genes.