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Related Experiment Videos

The colorectal microRNAome.

Jordan M Cummins1, Yiping He, Rebecca J Leary

  • 1The Sidney Kimmel Comprehensive Cancer Center and Howard Hughes Medical Institute, Johns Hopkins University Medical Institutions, Baltimore, MD 21231, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 1, 2006
PubMed
Summary

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Scientists discovered many new human microRNAs (miRNAs) using a novel technique called miRAGE. This research significantly expands the known catalog of human miRNAs and offers a new method for their discovery.

Area of Science:

  • Molecular Biology
  • Genomics
  • Biochemistry

Background:

  • MicroRNAs (miRNAs) are crucial regulators in multicellular organisms.
  • Current databases list 321 human miRNA sequences, with 234 experimentally verified.
  • The full extent of human miRNA repertoire remains largely unexplored.

Purpose of the Study:

  • To develop and apply a novel experimental approach, miRNA serial analysis of gene expression (miRAGE), for large-scale human miRNA discovery.
  • To identify novel miRNA candidates and uncharacterized miRNA* forms in human colorectal cells.
  • To establish a method for evaluating newly identified miRNA candidates.

Main Methods:

  • Development and application of the miRAGE technique for small RNA sequencing.
  • Analysis of 273,966 small RNA tags from human colorectal cells.

Related Experiment Videos

  • Experimental validation of candidate miRNAs by disrupting the Dicer gene in colorectal cancer cell lines.

    • Main Results:

    • Identification of 200 known mature miRNAs.
    • Discovery of 133 novel miRNA candidates.
    • Characterization of 112 previously unannotated miRNA* forms.

    Conclusions:

    • The human genome harbors a significantly larger number of miRNAs than previously identified.
    • The miRAGE approach provides a powerful tool for the large-scale experimental cloning of novel human miRNAs.
    • This study advances the understanding of miRNA regulation and expands the known human miRNAome.