Regulation of poly(A) site choice of several yeast mRNAs.
Several yeast genes produce multiple transcripts with different 3'-ends. Of these, four genes are known to produce truncated transcripts that end within the coding sequence of longer transcripts: CBP1 , AEP2 / ATP13 , RNA14 and SIR1 . It has been shown that the level of the truncated CBP1 transcript increases during the switch to respiratory growth while that of the full-length transcript decreases. To determine whether this phenomenon is unique to CBP1 , northern analysis was used to determine whether the levels of other truncated transcripts are regulated similarly by carbon source. The levels of the shortest transcripts of AEP2 / ATP13 and RNA14 increased during respiration while the shortest SIR1 transcript remained constant. However, two longer SIR1 transcripts were regulated reciprocally by carbon source. Mapping the 3'-ends of each transcript by sequencing partial cDNA clones revealed multiple 3'-ends for each transcript. Examination of the sequences surrounding the 3'-ends of the induced transcripts failed to identify a consensus sequence but did reveal weak putative 3'-end formation signals in all of the transcripts. Similarly, no consensus sequence was found when the sequences surrounding the 3'-ends of the longest transcripts were compared, but again weak putative 3'-end formation signals were identified. These data are suggestive of carbon source regulation of alternative poly(A) site choice in yeast.
Sparks
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Department of Biochemistry and Department Molecular and Cellular Biology, Life Sciences South Room 454, University of Arizona, Tucson, AZ 85721, USA.
Dieckmann
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D001483:Base Sequence; D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; D015152:Blotting, Northern; D002244:Carbon / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics; D015966:Gene Expression Regulation, Fungal; D005990:Glycerol / Q000494:pharmacology; D008954:Models, Biological; D008969:Molecular Sequence Data; D008970:Molecular Weight; D006180:Proton-Translocating ATPases / Q000235:genetics; D012323:RNA Processing, Post-Transcriptional; D012331:RNA, Fungal / Q000032:analysis / Q000378:metabolism; D012333:RNA, Messenger / Q000032:analysis / Q000378:metabolism*; D012045:Regulatory Sequences, Nucleic Acid; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins; D038281:Silent Information Regulator Proteins, Saccharomyces cerevisiae; D015534:Trans-Activators / Q000235:genetics; D039221:mRNA Cleavage and Polyadenylation Factors
D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; C064042:CBF1 protein, S cerevisiae; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D012331:RNA, Fungal; D012333:RNA, Messenger; C084121:SIR1 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D038281:Silent Information Regulator Proteins, Saccharomyces cerevisiae; D015534:Trans-Activators; D039221:mRNA Cleavage and Polyadenylation Factors; C512638:RNA14 protein, S cerevisiae; D002244:Carbon; D006180:Proton-Translocating ATPases; D005990:Glycerol