title: Snu56p is required for Mer1p-activated meiotic splicing.
abstract: Alternative or regulated splicing can be applied to genes that are transcribed but whose products may be deleterious or unnecessary to the cell. In the yeast Saccharomyces cerevisiae, positive splicing regulation occurs during meiosis in which diploid cells divide to form haploid gametes. The Mer1 protein recruits the U1 snRNP to specific pre-mRNAs, permitting spliceosomal assembly and splicing. The mature transcripts are required for meiotic progression and, subsequently, sporulation. We have identified a novel allele (snu56-2) of the essential U1 snRNP protein Snu56p that exhibits a sporulation defect. Using a CUP1 reporter assay and reverse transcriptase PCR, we demonstrate that this allele specifically impairs Mer1p-activated splicing. This is not a reflection of a generally deficient spliceosome, as these cells splice vegetative transcripts efficiently. Furthermore, Snu56p depletion in vivo does not significantly impact mitotic splicing. Thus, its splicing function appears to be limited to Mer1p-activated meiosis-specific splicing. Two-hybrid studies indicate that Snu56p interacts with the other two U1 snRNP factors (Mer1p and Nam8p) required for this process. Interestingly, these two proteins do not interact, suggesting that Snu56p links pre-mRNA-bound Mer1p to Nam8p in the U1 snRNP. This work demonstrates that the Snu56 protein is required for splicing only during meiosis.
authors.affiliation: Department of Molecular Biology, UMNDJ-SOM, 2 Medical Center Drive, Stratford, NJ 08084, USA. henrymf@umdnj.edu
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Balzer
authors.forename: Michael F
authors.initials: MF
authors.lastname: Henry
mesh_terms: D000483:Alleles; D004171:Diploidy; D017353:Gene Deletion; D015966:Gene Expression Regulation, Fungal; D006720:Homozygote; D008540:Meiosis / Q000235:genetics*; D011485:Protein Binding; D011484:Protein-Arginine N-Methyltransferases / Q000235:genetics / Q000378:metabolism; D012326:RNA Splicing / Q000235:genetics*; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D017412:Ribonucleoprotein, U1 Small Nuclear / Q000235:genetics / Q000378:metabolism*; D012441:Saccharomyces cerevisiae; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D012680:Sensitivity and Specificity; D020798:Two-Hybrid System Techniques
chemical_list: C092601:MER1 protein, S cerevisiae; D016601:RNA-Binding Proteins; D012097:Repressor Proteins; D017412:Ribonucleoprotein, U1 Small Nuclear; D029701:Saccharomyces cerevisiae Proteins; C528124:Snu56 protein, S cerevisiae; C475182:HMT1 protein, S cerevisiae; D011484:Protein-Arginine N-Methyltransferases