TY - JOUR T1 - Drosophila genome-wide RNAi screen identifies multiple regulators of HIF-dependent transcription in hypoxia. JF - PLoS Genet Y1 - 2010 A1 - Dekanty, Andrés A1 - Romero, Nuria M A1 - Bertolin, Agustina P A1 - Thomas, María G A1 - Leishman, Claudia C A1 - Perez-Perri, Joel I A1 - Boccaccio, Graciela L A1 - Wappner, Pablo KW - Animals KW - Anoxia KW - Argonaute Proteins KW - Basic Helix-Loop-Helix Transcription Factors KW - Cell Line KW - drosophila melanogaster KW - Drosophila Proteins KW - Eukaryotic Initiation Factors KW - Genome-Wide Association Study KW - RNA Interference KW - Transcription, Genetic AB -

Hypoxia-inducible factors (HIFs) are a family of evolutionary conserved alpha-beta heterodimeric transcription factors that induce a wide range of genes in response to low oxygen tension. Molecular mechanisms that mediate oxygen-dependent HIF regulation operate at the level of the alpha subunit, controlling protein stability, subcellular localization, and transcriptional coactivator recruitment. We have conducted an unbiased genome-wide RNA interference (RNAi) screen in Drosophila cells aimed to the identification of genes required for HIF activity. After 3 rounds of selection, 30 genes emerged as critical HIF regulators in hypoxia, most of which had not been previously associated with HIF biology. The list of genes includes components of chromatin remodeling complexes, transcription elongation factors, and translational regulators. One remarkable hit was the argonaute 1 (ago1) gene, a central element of the microRNA (miRNA) translational silencing machinery. Further studies confirmed the physiological role of the miRNA machinery in HIF-dependent transcription. This study reveals the occurrence of novel mechanisms of HIF regulation, which might contribute to developing novel strategies for therapeutic intervention of HIF-related pathologies, including heart attack, cancer, and stroke.

VL - 6 IS - 6 U1 - http://www.ncbi.nlm.nih.gov/pubmed/20585616?dopt=Abstract ER -