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Reference: Becerra M, et al. (2011) Comparative transcriptome analysis of yeast strains carrying slt2, rlm1, and pop2 deletions. Genome 54(2):99-109

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Abstract


The function of the genes SLT2 (encoding the Mpk1 protein), RLM1, and POP2 have previously been related to several stress responses in yeasts. DNA arrays have been used to identify differences among the transcriptomes of a Saccharomyces cerevisiae wild type strain and its derivative Deltaslt2, Deltarlm1, and Deltapop2 mutants. Correspondence analyses indicate that the vast majority of genes that show lower expression in Deltarlm1 also show lower expression in Deltaslt2. In contrast, there is little overlap between the results of the transcriptome analyses of the Deltapop2 strain and the Deltaslt2 or Deltarlm1 strains. The DNA array data were validated by reverse Northern blotting and chromatin immunoprecipitation (ChIp). ChIp assays demonstrate Rlm1p binding to specific regions of the promoters of two genes that show expression differences between the Deltarlm1 mutant and wild type strains. Interestingly, RLM1 deletion decreases the transcription of SLT2, encoding the Mpk1p kinase that phosphorylates Rlm1p, suggesting a feedback control in the signal transduction pathway. Also, deletion of RLM1 causes a decrease in the mRNA level of KDX1, which is paralogous to SLT2. In contrast, deletion of POP2 is accompanied by an increase of both SLT2 and KDX1 levels. We show that SLT2 mRNA increase in the Deltapop2 strain is due to a decrease in RNA turnover, consistent with the expected loss of RNA-deadenylase activity in this strain.

Reference Type
Journal Article
Authors
Becerra M, Lombardia LJ, Lamas-Maceiras M, Canto E, Rodriguez-Belmonte E, Cerdan ME
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