Abstract
Alternative cleavage and polyadenylation (APA) generates diverse mRNA isoforms. We developed 3′ region extraction and deep sequencing (3′READS) to address mispriming issues that commonly plague poly(A) site (pA) identification, and we used the method to comprehensively map pAs in the mouse genome. Thorough annotation of gene 3′ ends revealed over 5,000 previously overlooked pAs (∼8% of total) flanked by A-rich sequences, underscoring the necessity of using an accurate tool for pA mapping. About 79% of mRNA genes and 66% of long noncoding RNA genes undergo APA, but these two gene types have distinct usage patterns for pAs in introns and upstream exons. Quantitative analysis of APA isoforms by 3′READS indicated that promoter-distal pAs, regardless of intron or exon locations, become more abundant during embryonic development and cell differentiation and that upregulated isoforms have stronger pAs, suggesting global modulation of the 3′ end–processing activity in development and differentiation.
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Acknowledgements
We thank Y. Zhao and A. Antes for technical assistance, V. Jin for help with 3T3-L1 differentiation, C. MacDonald (Texas Tech University) for the anti-CstF64 antibody, L. Ford (Bioo Scientific) for pALL-A15 and pALL-A60 plasmids, and S. Gunderson for helpful discussions. This work was funded by the US National Institutes of Health grants (GM084089 and DK094207) to B.T.
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M.H., Z.J. and B.T. conceived of and designed the experiments. M.H., D.Z., W. Luo and B.Y. performed the experiments. Z.J., W. Li and J.Y.P. analyzed the data. G.Y. contributed reagents and materials. M.H., Z.J. and B.T. wrote the paper.
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B.T., M.H., Z.J. and W. Luo are named on the pending US patent application no. PCT/US2012/052122 based on this work.
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Hoque, M., Ji, Z., Zheng, D. et al. Analysis of alternative cleavage and polyadenylation by 3′ region extraction and deep sequencing. Nat Methods 10, 133–139 (2013). https://doi.org/10.1038/nmeth.2288
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DOI: https://doi.org/10.1038/nmeth.2288