Mapping the Human MiRNA Interactome by CLASH Reveals Frequent Noncanonical Binding

Overview

Journal Cell

Publisher Cell Press

Specialty Cell Biology

Date 2013 Apr 30

PMID 23622248

Citations 711

Authors

Aleksandra Helwak

Grzegorz Kudla

Tatiana Dudnakova

David Tollervey

Affiliations

Soon will be listed here.

Abstract

MicroRNAs (miRNAs) play key roles in gene regulation, but reliable bioinformatic or experimental identification of their targets remains difficult. To provide an unbiased view of human miRNA targets, we developed a technique for ligation and sequencing of miRNA-target RNA duplexes associated with human AGO1. Here, we report data sets of more than 18,000 high-confidence miRNA-mRNA interactions. The binding of most miRNAs includes the 5' seed region, but around 60% of seed interactions are noncanonical, containing bulged or mismatched nucleotides. Moreover, seed interactions are generally accompanied by specific, nonseed base pairing. 18% of miRNA-mRNA interactions involve the miRNA 3' end, with little evidence for 5' contacts, and some of these were functionally validated. Analyses of miRNA:mRNA base pairing showed that miRNA species systematically differ in their target RNA interactions, and strongly overrepresented motifs were found in the interaction sites of several miRNAs. We speculate that these affect the response of RISC to miRNA-target binding.

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