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A high throughput experimental approach to identify miRNA targets in human cells

Nucleic Acids Res. 2009 Nov;37(20):e137. doi: 10.1093/nar/gkp715. Epub 2009 Sep 4.

Abstract

The study of human microRNAs is seriously hampered by the lack of proper tools allowing genome-wide identification of miRNA targets. We performed Ribonucleoprotein ImmunoPrecipitation-gene Chip (RIP-Chip) using antibodies against wild-type human Ago2 in untreated Hodgkin lymphoma (HL) cell lines. Ten to thirty percent of the gene transcripts from the genome were enriched in the Ago2-IP fraction of untreated cells, representing the HL miRNA-targetome. In silico analysis indicated that approximately 40% of these gene transcripts represent targets of the abundantly co-expressed miRNAs. To identify targets of miR-17/20/93/106, RIP-Chip with anti-miR-17/20/93/106 treated cells was performed and 1189 gene transcripts were identified. These genes were analyzed for miR-17/20/93/106 target sites in the 5'-UTRs, coding regions and 3'-UTRs. Fifty-one percent of them had miR-17/20/93/106 target sites in the 3'-UTR while 19% of them were predicted miR-17/20/93/106 targets by TargetScan. Luciferase reporter assay confirmed targeting of miR-17/20/93/106 to the 3'-UTRs of 8 out of 10 genes. In conclusion, we report a method which can establish the miRNA-targetome in untreated human cells and identify miRNA specific targets in a high throughput manner. This approach is applicable to identify miRNA targets in any human tissue sample or purified cell population in an unbiased and physiologically relevant manner.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Argonaute Proteins
  • Binding Sites
  • Cell Line
  • Eukaryotic Initiation Factor-2 / isolation & purification
  • Eukaryotic Initiation Factor-2 / metabolism
  • Gene Expression Regulation*
  • Genes, Reporter
  • Humans
  • Immunoprecipitation
  • Luciferases / genetics
  • MicroRNAs / metabolism*
  • Oligonucleotide Array Sequence Analysis / methods*
  • Reproducibility of Results

Substances

  • AGO2 protein, human
  • Argonaute Proteins
  • Eukaryotic Initiation Factor-2
  • MIRN17 microRNA, human
  • MicroRNAs
  • Luciferases