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• W2157290190 abstract "Polyoma virus late nuclear primary transcripts are giant and heterogeneous, containing tandem repeats of the late strand of the circular viral genome. Late pre-mRNA processing involves the splicing of noncoding 'leader' exons to each other (removing genome-length introns), with the joining of the last leader to a coding 'body' exon. We have constructed a number of mutants blocked only in leader-leader splicing, or blocked in both leader-leader and leader-body splicing. We examined the accumulation of both nuclear and cytoplasmic late-strand RNAs in NIH3T3 cells. Consistent with our previous results, mutants lacking the 3' splice site of the late leader (leader-leader splicing blocked) showed a 10-20 fold defect in late RNA accumulation. Mutants which lacked the leader 5' splice site (leader-body splicing blocked) had a more profound defect, exhibiting virtually no late-strand cytoplasmic or nuclear RNA. This result was unexpected as a substantial proportion of wild type late cytoplasmic messages are unspliced. A mutant with no intron, but having functional 3' and 5' splice sites bordering the leader exon, is capable of producing large amounts of unspliced late mRNA. This demonstrates that an excisable intron is not a requirement for late mRNA accumulation. The accumulation of polyoma late mRNAs requires the presence of leader exons bordered by functional 3' and 5' splice sites, whether or not these sites are used during pre-mRNA processing." @default.
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• W2157290190 date "1991-01-01" @default.
• W2157290190 modified "2023-09-24" @default.
• W2157290190 title "Splice site requirement for the efficient accumulation of polyoma virus late mRNAs" @default.
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• W2157290190 doi "https://doi.org/10.1093/nar/19.11.3011" @default.
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