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Transcriptional ter...
Transcriptional termination in the Balbiani ring 1 gene is closely coupled to 3'-end formation and excision of the 3'-terminal intron
- Artikel/kapitelEngelska1998
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1998-09-01
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Cold Spring Harbor Laboratory,1998
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LIBRIS-ID:oai:prod.swepub.kib.ki.se:1943598
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http://kipublications.ki.se/Default.aspx?queryparsed=id:1943598URI
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https://doi.org/10.1101/gad.12.17.2759DOI
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Språk:engelska
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Sammanfattning på:engelska
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We have analyzed transcription termination, 3′-end formation, and excision of the 3′-terminal intron in vivo in the Balbiani ring 1 (BR1) gene and its pre-mRNA. We show that full-length RNA transcripts are evenly spaced on the gene from a position 300 bp upstream to a region 500–700 bp downstream of the polyadenylation sequence. Very few full-length transcripts and no short, cleaved, nascent transcripts could be observed downstream of this region. Pre-mRNA with 10–20 adenylate residues accumulates at the active gene and then rapidly leaves from the gene locus. Only polyadenylated pre-mRNAs could be detected in the nucleoplasm. Our results are consistent with the hypothesis that transcription termination occurs in a narrow region for the majority of transcripts, simultaneous with 3′-end formation. Excision of the 3′-terminal intron occurs before 3′-end formation in about 5% of the nascent transcripts. When transcription terminates, 3′ cleavage takes place and 10–20 adenylate residues are added, the 3′-terminal intron is excised from additionally about 75% of the pre-mRNA at the gene locus. Our data support a close temporal and spatial coupling of transcription termination and the cleavage and initial polyadenylation of 3′-end formation. Excision of the 3′-terminal intron is highly stimulated as the cleavage/polyadenylation complex assembles and 3′-end formation is initiated.
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Belikov, SKarolinska Institutet
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Wieslander, L
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Karolinska Institutet
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Ingår i:Genes & development: Cold Spring Harbor Laboratory12:17, s. 2759-27690890-93691549-5477
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