We present the first large-scale identification of lariats—the transient branched introns that are released as a byproduct of pre-mRNA splicing. The locations of the branchpoints in these introns provide insight into the early steps of splicing. From this data set, we have developed a comprehensive model of 3′ splice-site selection, identified new mechanisms of alternative splicing and mapped the distribution of splicing factors around branchpoints.
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We would like to thank R. Freiman and members of the Fairbrother lab for useful comments, suggestions and assistance; G. Schroth and Illumina for sharing body-map sequencing data; and G. Yeo for sharing RNA binding data before publication. The lab was supported by US federal funding sources R01GM095612–01 and NSF1020552 (both to A.J.T., W.G.F., J.S.S.) and by Brown University through the use of the OSCAR cluster (administered by the Center for Computation and Visualization) and the genomics core facility (8P30GM103410).
The authors declare no competing financial interests.
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Taggart, A., DeSimone, A., Shih, J. et al. Large-scale mapping of branchpoints in human pre-mRNA transcripts in vivo. Nat Struct Mol Biol 19, 719–721 (2012). https://doi.org/10.1038/nsmb.2327
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