Remodeling yeast gene transcription by activating the Ty1 long terminal repeat retrotransposon under severe adenine deficiency.
The Ty1 long terminal repeat (LTR) retrotransposon of Saccharomyces cerevisiae is a powerful model to understand the activation of transposable elements by stress and their impact on genome expression. We previously discovered that Ty1 transcription is activated under conditions of severe adenine starvation. The mechanism of activation is independent of the Bas1 transcriptional activator of the de novo AMP biosynthesis pathway and probably involves chromatin remodeling at the Ty1 promoter. Here, we show that the 5' LTR has a weak transcriptional activity and is sufficient for the activation by severe adenine starvation. Furthermore, we demonstrate that Ty1 insertions that bring Ty1 promoter sequences into the vicinity of a reporter gene confer adenine starvation regulation on it. We provide evidence that similar coactivation of genes adjacent to Ty1 sequences occurs naturally in the yeast genome, indicating that Ty1 insertions can mediate transcriptional control of yeast gene expression under conditions of severe adenine starvation. Finally, the transcription pattern of genes adjacent to Ty1 insertions suggests that severe adenine starvation facilitates the initiation of transcription at alternative sites, partly located in the 5' LTR. We propose that Ty1-driven transcription of coding and noncoding sequences could regulate yeast gene expression in response to stress.
Servant
Géraldine
G
CNRS UMR 7151, Hôpital Saint-Louis, 1 Avenue C, Vellefaux F-75475, Paris Cedex 10, France.
Pennetier
Carole
C
Lesage
Pascale
P
D000225:Adenine / Q000378:metabolism*; D000251:Adenosine Triphosphatases; D000483:Alleles; D001483:Base Sequence; D004268:DNA-Binding Proteins / Q000378:metabolism; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D006657:Histones / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism; D011401:Promoter Regions, Genetic / Q000235:genetics; D018626:Retroelements / Q000235:genetics*; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D020079:Terminal Repeat Sequences / Q000235:genetics*; D014157:Transcription Factors / Q000378:metabolism; D014158:Transcription, Genetic; D001616:beta-Galactosidase / Q000378:metabolism
D004268:DNA-Binding Proteins; C487887:ESF1 protein, S cerevisiae; D006657:Histones; D009687:Nuclear Proteins; D018626:Retroelements; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D001616:beta-Galactosidase; D000251:Adenosine Triphosphatases; C499333:SNF2 protein, S cerevisiae; D000225:Adenine