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Fission yeast Cactin restricts telomere transcription and elongation by promoting Rap1 pre-mRNA splicing and protein stabilization

ABSTRACT: RNA transcriptome analysis of S.pombe fission yeast cells deleted for cay1+/SPBC2F12.12c (cay1D) and wildtype The transcriptome of cay1+ deleted fission yeast cells was characterized and compared to wildtype yeasts to identify differentially expressed genes controlled by Cay1 on a transcriptional or post-transcriptional level.

ORGANISM(S): Schizosaccharomyces pombe

PROVIDER: GSE61792 | GEO | 2014/09/27

SECONDARY ACCESSION(S): PRJNA262143

REPOSITORIES: GEO

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Fission yeast Cactin restricts telomere transcription and elongation by promoting Rap1 pre-mRNA splicing and protein stabilization

Project description:RNA transcriptome analysis of S.pombe fission yeast cells deleted for cay1+/SPBC2F12.12c (cay1D) and wildtype The transcriptome of cay1+ deleted fission yeast cells was characterized and compared to wildtype yeasts to identify differentially expressed genes controlled by Cay1 on a transcriptional or post-transcriptional level. 3 biological replicates of wildtype and cay1D fission yeast cells were prepared in parallel. Based on poor quality array hybridization one cay1D replicate was excluded from further analysis

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Fission yeast Cactin restricts telomere transcription and elongation by controlling Rap1 levels.

Project description:The telomeric transcriptome comprises multiple long non-coding RNAs generated by transcription of linear chromosome ends. In a screening performed in Schizosaccharomyces pombe, we identified factors modulating the cellular levels of the telomeric transcriptome. Among these factors, Cay1 is the fission yeast member of the conserved family of Cactins, uncharacterized proteins crucial for cell growth and survival. In cay1∆ mutants, the cellular levels of the telomeric factor Rap1 are drastically diminished due to defects in rap1+ pre-mRNA splicing and Rap1 protein stability. cay1∆ cells accumulate histone H3 acetylated at lysine 9 at telomeres, which become transcriptionally desilenced, are over-elongated by telomerase and cause chromosomal aberrations in the cold. Overexpressing Rap1 in cay1+ deleted cells significantly reverts all telomeric defects. Additionally, cay1∆ mutants accumulate unprocessed Tf2 retrotransposon RNA through Rap1-independent mechanisms. Thus, Cay1 plays crucial roles in cells by ultimately harmonizing expression of transcripts originating from seemingly unrelated genomic loci.

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