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• W4211134996 endingPage "e1010028" @default.
• W4211134996 startingPage "e1010028" @default.
• W4211134996 abstract "Pre-mRNA splicing is an essential step of eukaryotic gene expression carried out by a series of dynamic macromolecular protein/RNA complexes, known collectively and individually as the spliceosome. This series of spliceosomal complexes define, assemble on, and catalyze the removal of introns. Molecular model snapshots of intermediates in the process have been created from cryo-EM data, however, many aspects of the dynamic changes that occur in the spliceosome are not fully understood. Caenorhabditis elegans follow the GU-AG rule of splicing, with almost all introns beginning with 5' GU and ending with 3' AG. These splice sites are identified early in the splicing cycle, but as the cycle progresses and custody of the pre-mRNA splice sites is passed from factor to factor as the catalytic site is built, the mechanism by which splice site identity is maintained or re-established through these dynamic changes is unclear. We performed a genetic screen in C. elegans for factors that are capable of changing 5' splice site choice. We report that KIN17 and PRCC are involved in splice site choice, the first functional splicing role proposed for either of these proteins. Previously identified suppressors of cryptic 5' splicing promote distal cryptic GU splice sites, however, mutations in KIN17 and PRCC instead promote usage of an unusual proximal 5' splice site which defines an intron beginning with UU, separated by 1nt from a GU donor. We performed high-throughput mRNA sequencing analysis and found that mutations in PRCC, and to a lesser extent KIN17, changed alternative 5' splice site usage at native sites genome-wide, often promoting usage of nearby non-consensus sites. Our work has uncovered both fine and coarse mechanisms by which the spliceosome maintains splice site identity during the complex assembly process." @default.
• W4211134996 created "2022-02-13" @default.
• W4211134996 creator A5005777750 @default.
• W4211134996 creator A5061159882 @default.
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• W4211134996 creator A5080544986 @default.
• W4211134996 creator A5083859807 @default.
• W4211134996 creator A5066264243 @default.
• W4211134996 date "2022-02-10" @default.
• W4211134996 modified "2023-09-27" @default.
• W4211134996 title "A genetic screen in C. elegans reveals roles for KIN17 and PRCC in maintaining 5’ splice site identity" @default.
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