{"database":"GEO","file_versions":[{"headers":{"Content-Type":["application/json"]},"body":{"files":{"Other":["ftp://ftp.ncbi.nlm.nih.gov/geo/series/GSE300nnn/GSE300776/"]},"type":"primary"},"statusCodeValue":200,"statusCode":"OK"}],"scores":null,"additional":{"omics_type":["Genomics"],"species":["Schizosaccharomyces pombe"],"gds_type":["Non-coding RNA profiling by high throughput sequencing"," Expression profiling by high throughput sequencing"],"full_dataset_link":["https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE300776"],"repository":["GEO"],"entry_type":["GSE"],"additional_accession":[]},"is_claimable":false,"name":"Spliceosomal proteins direct RNA methylation to modulate gene expression and silence retrotransposons [smallRNA-seq]","description":"RNA modifications play indispensable roles in RNA processing and gene regulation, but the mechanistic diversity and transcript specificity of RNA-modifying activities remain unclear. Using genetic screening and biochemical analyses in S. pombe, we identified the RNA methyltransferase Tgs1 as a component of a protein complex called TEaM, which is specifically recruited by spliceosomal proteins to transcripts containing inefficiently spliced cryptic introns. Strikingly, the presence of cryptic introns alone can trigger TEaM-dependent silencing of stress-inducible genes and repetitive elements, including retrotransposons, while Tgs1 is also directed to gametogenic transcripts via a YTH-domain RNA-binding protein. In both contexts, Tgs1 catalyzes trimethylguanosine (TMG) capping, a modification that recruits the conserved Pir2/ARS2 protein and promotes RNA processing through the RNAi pathway. Our findings uncover how splicing machinery and YTH proteins converge on a common regulatory mechanism—TMG capping—that facilitates RNAi-mediated silencing via Pir2/ARS2, providing new insights into gene silencing pathways across eukaryotic species.","dates":{"publication":"2026/06/25"},"accession":"GSE300776","cross_references":{"GSM":["GSM9068375","GSM9068374","GSM9068373","GSM9068372","GSM9068371","GSM9068378","GSM9068377","GSM9068376"],"GPL":["20584"],"GSE":["300776"],"taxon":["Schizosaccharomyces pombe"]}}