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Related Experiment Videos

Origin and evolution of human microRNAs from transposable elements.

Jittima Piriyapongsa1, Leonardo Mariño-Ramírez, I King Jordan

  • 1School of Biology, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.

Genetics
|April 17, 2007
PubMed
Summary
This summary is machine-generated.

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Transposable elements (TEs) contribute to human microRNA (miRNA) genes, regulating thousands of genes. These TE-derived miRNAs offer a source for discovering new miRNA genes and understanding regulatory evolution.

Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Transposable elements (TEs) are mobile genetic sequences.
  • MicroRNAs (miRNAs) are small non-coding RNAs involved in gene regulation.
  • The contribution of TEs to miRNA gene evolution is not well understood.

Purpose of the Study:

  • To investigate the extent of transposable element (TE) contribution to human microRNA (miRNA) genes.
  • To analyze the evolutionary dynamics of TE-derived human miRNAs.
  • To identify novel TE-derived miRNA genes.

Main Methods:

  • Bioinformatic analysis of human miRNA and transposable element sequences.
  • Sequence comparison and conservation analysis.
  • miRNA and messenger RNA (mRNA) expression pattern analysis.

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Main Results:

  • Identified 55 experimentally characterized human miRNA genes derived from TEs, potentially regulating thousands of human genes.
  • TE-derived miRNAs are generally less conserved than non-TE-derived miRNAs, with 18 showing relative conservation.
  • Predicted an additional 85 novel TE-derived miRNA genes, with evidence of anti-correlated expression with target genes.

Conclusions:

  • Transposable elements are a significant source of human miRNA genes.
  • TE-derived miRNAs contribute to regulatory divergence between species.
  • Genomic surveys for miRNA genes should include TE sequences for comprehensive discovery.