The influence of microRNAs and poly(A) tail length on endogenous mRNA–protein complexes
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1.54 MB
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Author(s)
Wang, Miranda
Lugowski, Andrew
Nicholson, Beth
Laver, John D.
Sidhu, Sachdev S.
Smibert, Craig A.
Lipshitz, Howard D.
Subtelny, Alexander Orest
Rissland, Olivia S.
Bartel, David
Date Issued
October 2017
Journal
Genome Biology
Publisher
Biomed Central Ltd.
Citation
Rissland, Olivia S., et al. “The Influence of MicroRNAs and Poly(A) Tail Length on Endogenous MRNA–Protein Complexes.” Genome Biology, vol. 18, no. 1, Dec. 2017. © 2017 The Authors
Version
Final published version
Abstract
Background: All mRNAs are bound in vivo by proteins to form mRNA-protein complexes (mRNPs), but changes in the composition of mRNPs during posttranscriptional regulation remain largely unexplored. Here, we have analyzed, on a transcriptome-wide scale, how microRNA-mediated repression modulates the associations of the core mRNP components eIF4E, eIF4G, and PABP and of the decay factor DDX6 in human cells. Results: Despite the transient nature of repressed intermediates, we detect significant changes in mRNP composition, marked by dissociation of eIF4G and PABP, and by recruitment of DDX6. Furthermore, although poly(A)-tail length has been considered critical in post-transcriptional regulation, differences in steady-state tail length explain little of the variation in either PABP association or mRNP organization more generally. Instead, relative occupancy of core components correlates best with gene expression. Conclusions: These results indicate that posttranscriptional regulatory factors, such as microRNAs, influence the associations of PABP and other core factors, and do so without substantially affecting steady-state tail length.
MIT Department
Massachusetts Institute of Technology. Department of Biology
Whitehead Institute for Biomedical Research
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1186/s13059-017-1330-z
