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Genome-wide Screen for miRNA Targets Using the MISSION Target ID Library
08:40

Genome-wide Screen for miRNA Targets Using the MISSION Target ID Library

Published on: April 6, 2012

[Oncogenic and tumour suppressor microRNAs]

Anne-Laure Finoux1, Pascal Chartrand

  • 1Département de Biochimie, Université de Montréal, 2900, Edouard-Montpetit, Montréal, Québec, H3C 3J7 Canada.

Medecine Sciences : M/S
|January 1, 2009
PubMed

Insights

MicroRNAs regulate gene expression and can act as oncogenes or tumor suppressors in cancer. The miR-17-92 cluster promotes tumors by targeting apoptosis and proliferation genes, while c-Myc influences these microRNAs.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • MicroRNAs (miRNAs) are key regulators of gene expression, impacting protein translation and mRNA degradation.
  • Dysregulated miRNA expression is implicated in various cancers, suggesting roles as oncogenes or tumor suppressors.
  • The miR-17-92 cluster has demonstrated oncogenic properties in Myc-induced B cell lymphoma models.

Purpose of the Study:

  • To elucidate the role of microRNAs in cancer development and gene regulation.
  • To investigate the oncogenic mechanisms of the miR-17-92 cluster.
  • To understand how c-Myc proto-oncogene misregulation contributes to tumorigenesis via miRNA control.

Main Methods:

  • Analysis of miRNA expression patterns in cancer.
  • Identification of miRNA targets involved in apoptosis and cell proliferation.
  • Investigation of the regulatory relationship between c-Myc and specific microRNAs.

Main Results:

  • The miR-17-92 cluster targets mRNAs encoding proteins that inhibit apoptosis and promote proliferation, contributing to its oncogenic role.
  • Tumor suppressor miRNAs, such as let-7, target oncogenes and are often downregulated in cancers.
  • c-Myc was found to control the expression of several microRNAs, linking its proto-oncogenic activity to miRNA dysregulation.

Conclusions:

  • MicroRNAs play critical roles in tumorigenesis, acting as either oncogenes or tumor suppressors.
  • The miR-17-92 cluster promotes cancer progression through specific gene targeting.
  • c-Myc's influence on miRNA expression provides a novel mechanism for its oncogenic function.

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