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• W2032275001 abstract "SR proteins and related factors play widespread roles in alternative pre-mRNA splicing and are known to promote splice site recognition through their Arg–Ser-rich effector domains. However, binding of SR regulators to some targets results in repression of splice sites through a distinct mechanism. Here, we investigate how activated and repressed targets of the Drosophila SR regulator Transformer2 elicit its differing effects on splicing. We find that, like activation, repression affects early steps in the recognition of splice sites and spliceosome assembly. Repositioning of regulatory elements reveals that Tra2 complexes that normally repress splicing from intronic positions activate splicing when located in an exon. Protein tethering experiments demonstrate that this position dependence is an intrinsic property of Tra2 and further show that repression and activation are mediated by separate effector domains of this protein. When other Drosophila SR factors (SF2 and Rbp1) that activate splicing from exonic positions were tethered intronically they failed to either activate or repress splicing. Interestingly, both activities of Tra2 favor the exonic identity of the RNA sequences that encompass its binding sites. This suggests a model in which these two opposite functions act in concert to define both the position and extent of alternatively spliced exons." @default.
• W2032275001 created "2016-06-24" @default.
• W2032275001 creator A5007599549 @default.
• W2032275001 creator A5043284553 @default.
• W2032275001 date "2011-09-13" @default.
• W2032275001 modified "2023-10-15" @default.
• W2032275001 title "Activation and repression functions of an SR splicing regulator depend on exonic versus intronic-binding position" @default.
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• W2032275001 doi "https://doi.org/10.1093/nar/gkr713" @default.
• W2032275001 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3245930" @default.
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