MicroRNAs and their isomiRs function cooperatively to target common biological pathways.

Abstract:

BACKGROUND:Variants of microRNAs (miRNAs), called isomiRs, are commonly reported in deep-sequencing studies; however, the functional significance of these variants remains controversial. Observational studies show that isomiR patterns are non-random, hinting that these molecules could be regulated and therefore functional, although no conclusive biological role has been demonstrated for these molecules. RESULTS:To assess the biological relevance of isomiRs, we have performed ultra-deep miRNA-seq on ten adult human tissues, and created an analysis pipeline called miRNA-MATE to align, annotate, and analyze miRNAs and their isomiRs. We find that isomiRs share sequence and expression characteristics with canonical miRNAs, and are generally strongly correlated with canonical miRNA expression. A large proportion of isomiRs potentially derive from AGO2 cleavage independent of Dicer. We isolated polyribosome-associated mRNA, captured the mRNA-bound miRNAs, and found that isomiRs and canonical miRNAs are equally associated with translational machinery. Finally, we transfected cells with biotinylated RNA duplexes encoding isomiRs or their canonical counterparts and directly assayed their mRNA targets. These studies allow us to experimentally determine genome-wide mRNA targets, and these experiments showed substantial overlap in functional mRNA networks suppressed by both canonical miRNAs and their isomiRs. CONCLUSIONS:Together, these results find isomiRs to be biologically relevant and functionally cooperative partners of canonical miRNAs that act coordinately to target pathways of functionally related genes. This work exposes the complexity of the miRNA-transcriptome, and helps explain a major miRNA paradox: how specific regulation of biological processes can occur when the specificity of miRNA targeting is mediated by only 6 to 11 nucleotides.

journal_name

Genome Biol

journal_title

Genome biology

authors

Cloonan N,Wani S,Xu Q,Gu J,Lea K,Heater S,Barbacioru C,Steptoe AL,Martin HC,Nourbakhsh E,Krishnan K,Gardiner B,Wang X,Nones K,Steen JA,Matigian NA,Wood DL,Kassahn KS,Waddell N,Shepherd J,Lee C,Ichikawa J,McKer

doi

10.1186/gb-2011-12-12-r126

subject

Has Abstract

pub_date

2011-12-30 00:00:00

pages

R126

issue

12

eissn

1474-7596

issn

1474-760X

pii

gb-2011-12-12-r126

journal_volume

12

pub_type

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