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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Genetics
2015 ; 199
(3
): 739-48
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A HIF-independent mediator of transcriptional responses to oxygen deprivation in
Caenorhabditis elegans
#MMPMID25552276
Padmanabha D
; Padilla PA
; You YJ
; Baker KD
Genetics
2015[Mar]; 199
(3
): 739-48
PMID25552276
show ga
The adaptive response to hypoxia is accompanied by widespread transcriptional
changes that allow for prolonged survival in low oxygen. Many of these changes
are directly regulated by the conserved hypoxia-inducible factor-1 (HIF-1)
complex; however, even in its absence, many oxygen-sensitive transcripts in
Caenorhabditis elegans are appropriately regulated in hypoxia. To identify
mediators of these non-HIF-dependent responses, we established a hif-1 mutant
reporter line that expresses GFP in hypoxia or when worms are treated with the
hypoxia mimetic cobalt chloride (CoCl2). The reporter is selective and HIF
independent, in that it remains insensitive to a number of cellular stresses, but
is unaffected by mutation of the prolyl hydroxylase egl-9, suggesting that the
regulators of this response pathway are different from those controlling the HIF
pathway. We used the HIF-independent reporter to screen a transcription factor
RNA interference (RNAi) library and identified genes that are required for
hypoxia-sensitive and CoCl2-induced GFP expression. We identified the zinc finger
protein BLMP-1 as a mediator of the HIF-independent response. We show that
mutation of blmp-1 renders animals sensitive to hypoxic exposure and that blmp-1
is required for appropriate hypoxic-induced expression of HIF-independent
transcripts. Further, we demonstrate that BLMP-1 is necessary for an increase of
hypoxia-dependent histone acetylation within the promoter of a non-HIF-dependent
hypoxia response gene.