Individual microRNAs (miRNAs) display distinct mRNA targeting "rules"

Wang Xia Wang, Bernard R. Wilfred, Kevin Xie, Mary H. Jennings, Yanling Hu, Arnold J. Stromberg, Peter T. Nelson

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

MicroRNAs (miRNAs) guide Argonaute (AGO)-containing microribonucleoprotein (miRNP) complexes to target mRNAs. It has been assumed that miRNAs behave similarly to each other with regard to mRNA target recognition. The usual assumptions, which are based on prior studies, are that miRNAs target preferentially sequences in the 3′UTR of mRNAs, guided by the 5′ "seed" portion of the miRNAs. Here we isolated AGO- and miRNA-containing miRNPs from human H4 tumor cells by co-immunoprecipitation (co-IP) with anti-AGO antibody. Cells were transfected with miR-107, miR-124, miR-128, miR-320, or a negative control miRNA. Co-IPed RNAs were subjected to downstream high-density Affymetrix Human Gene 1.0 ST microarray analyses using an assay we validated previously - a "RIP-Chip" experimental design. RIPChip data provided a list of mRNAs recruited into the AGO-miRNP in correlation to each miRNA. These experimentally identified miRNA targets were analyzed for complementary six nucleotide "seed" sequences within the transfected miRNAs. We found that miR-124 targets tended to have sequences in the 3′UTR that would be recognized by the 5′ seed of miR-124, as described in previous studies. By contrast, miR-107 targets tended to have 'seed' sequences in the mRNA open reading frame, but not the 3′ UTR. Further, mRNA targets of miR-128 and miR-320 are less enriched for 6-mer seed sequences in comparison to miR-107 and miR-124. In sum, our data support the importance of the 5′ seed in determining binding characteristics for some miRNAs; however, the "binding rules" are complex, and individual miRNAs can have distinct sequence determinants that lead to mRNA targeting.

Original languageEnglish
Pages (from-to)373-380
Number of pages8
JournalRNA Biology
Volume7
Issue number3
DOIs
StatePublished - 2010

Bibliographical note

Funding Information:
We thank Ms. Willa Huang for technical and collegial assistance in the project. This study was supported by grants R01 NS061933 and K08 NS050110 from the National Institutes of Health, Bethesda, MD and NIRG-89917 from the Alzheimer Association.

Keywords

  • GRN
  • INSIG1
  • Neurons brain
  • Ppib
  • Prediction
  • RISC
  • Targets

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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