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MiRNAs, epigenetics, and cancer

Arefeh Rouhi1, Dixie L Mager, R Keith Humphries

  • 1Terry Fox Laboratory, BC Cancer Agency Research Centre, 675 West 10th Avenue, Vancouver, BC, Canada V5Z 1L3.

Mammalian Genome : Official Journal of the International Mammalian Genome Society
|August 9, 2008
PubMed

Insights

Epigenetic changes in cancer can alter microRNA (miRNA) expression by affecting their host genes. This review explores how these modifications influence miRNA regulation and function in oncogenesis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • MicroRNAs (miRNAs) play context-dependent roles in cancer, acting as tumor suppressors or oncogenes due to their multiple targets.
  • Genome-wide epigenetic alterations are common in cancers and impact gene transcription.
  • The transcriptional regulation of miRNAs, especially in response to epigenetic changes, is largely unexplored.

Purpose of the Study:

  • To review existing literature on the epigenetic regulation of miRNA genes in various cancers.
  • To explore the potential impact of epigenetic modifications on miRNA transcription and expression.
  • To elucidate the direct and indirect mechanisms by which epigenetic changes affect miRNA expression.

Main Methods:

  • Literature review of studies investigating epigenetic regulation of miRNA genes in cancer.
  • Analysis of the relationship between host gene transcription and intronic miRNA expression.
  • Speculative analysis of epigenetic mechanisms influencing miRNA regulation.

Main Results:

  • Many miRNAs are located within introns of protein-coding genes, making their expression susceptible to host gene transcriptional changes.
  • Epigenetic modifications can influence miRNA expression both directly and indirectly.
  • The precise mechanisms of epigenetic regulation on miRNA transcription in cancer require further investigation.

Conclusions:

  • Epigenetic changes in cancer have the potential to significantly alter miRNA expression patterns.
  • Understanding these epigenetic regulatory mechanisms is crucial for deciphering miRNA roles in oncogenesis.
  • Further research is needed to fully elucidate the interplay between epigenetics and miRNA regulation in cancer development.

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