title: Regulation of conditional gene expression by coupled transcription repression and RNA degradation.
abstract: Gene expression is determined by a combination of transcriptional and post-transcriptional regulatory events that were thought to occur independently. This report demonstrates that the genes associated with the Snf3p-Rgt2p glucose-sensing pathway are regulated by interconnected transcription repression and RNA degradation. Deletion of the dsRNA-specific ribonuclease III Rnt1p increased the expression of Snf3p-Rgt2p-associated transcription factors in vivo and the recombinant enzyme degraded their messenger RNA in vitro. Surprisingly, Rnt1ps effect on gene expression in vivo was both RNA and promoter dependent, thus linking RNA degradation to transcription. Strikingly, deletion of RNT1-induced promoter-specific transcription of the glucose sensing genes even in the absence of RNA cleavage signals. Together, the results presented here support a model in which co-transcriptional RNA degradation increases the efficiency of gene repression, thereby allowing an effective cellular response to the continuous changes in nutrient concentrations.
authors.affiliation: RNA Group, Département de microbiologie et d'infectiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Québec, Canada, J1H 5N4.
authors.forename: Mathieu
authors.initials: M
authors.lastname: Lavoie
authors.forename: Dongling
authors.initials: D
authors.lastname: Ge
authors.forename: Sherif
authors.initials: S
authors.lastname: Abou Elela
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D004268:DNA-Binding Proteins / Q000378:metabolism; D015966:Gene Expression Regulation, Fungal; D005947:Glucose / Q000378:metabolism; D009004:Monosaccharide Transport Proteins / Q000378:metabolism; D011401:Promoter Regions, Genetic; D012319:RNA Polymerase II / Q000378:metabolism; D020871:RNA Stability; D012333:RNA, Messenger / Q000378:metabolism*; D043244:Ribonuclease III / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D004268:DNA-Binding Proteins; C118806:MTH1 protein, S cerevisiae; D009004:Monosaccharide Transport Proteins; C102114:RGT1 protein, S cerevisiae; C112512:RGT2 protein, S cerevisiae; D012333:RNA, Messenger; C104463:SNF3 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D012319:RNA Polymerase II; C468367:RNT1 protein, S cerevisiae; D043244:Ribonuclease III; D005947:Glucose