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Relative contribution of sequence and structure features to the mRNA binding of Argonaute/EIF2C-miRNA complexes and the degradation of miRNA targets

Item Type:Article
Title:Relative contribution of sequence and structure features to the mRNA binding of Argonaute/EIF2C-miRNA complexes and the degradation of miRNA targets
Creators Name:Hausser, J. and Landthaler, M. and Jaskiewicz, L. and Gaidatzis, D. and Zavolan, M.
Abstract:How miRNAs recognize their target sites is a puzzle that many experimental and computational studies aimed to solve. Several features, such as perfect pairing of the miRNA seed, additional pairing in the 3' region of the miRNA, relative position in the 3' UTR, and the A/U content of the environment of the putative site, have been found to be relevant. Here we have used a large number of previously published data sets to assess the power that various sequence and structure features have in distinguishing between putative sites that do and those that do not appear to be functional. We found that although different data sets give widely different answers when it comes to ranking the relative importance of these features, the sites inferred from most transcriptomics experiments, as well as from comparative genomics, appear similar at this level. This suggests that miRNA target sites have been selected in evolution on their ability to trigger mRNA degradation. To understand at what step in the miRNA-induced response individual features play a role, we transfected human HEK293 cells with miRNAs and analyzed the association of Argonaute/EIF2C-miRNA complexes with target mRNAs and the degradation of these messages. We found that structural features of the target site are only important for Argonaute/EIF2C binding, while sequence features such as the A/U content of the 3' UTR are important for mRNA degradation.
Keywords:3' Untranslated Regions, Binding Sites, Cell Line, Cluster Analysis, Genetic Databases, Eukaryotic Initiation Factors, Gene Expression Profiling, MicroRNAs, Nucleic Acid Conformation, Messenger RNA, Genetic Transcription, Transfection
Source:Genome Research
ISSN:1088-9051
Publisher:Cold Spring Harbor Laboratory Press (U.S.A.)
Volume:19
Number:11
Page Range:2009-2020
Date:November 2009
Official Publication:https://doi.org/10.1101/gr.091181.109
PubMed:View item in PubMed

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