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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
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Pathway Implications of Aberrant Global Methylation in Adrenocortical Cancer

Christophe R Legendre1, Michael J Demeure1, Timothy G Whitsett1

  • 1Translational Genomics Research Institute, Phoenix, AZ, United States of America.

Plos One
|March 11, 2016
PubMed
Abstract

Insights

DNA methylation impacts adrenocortical carcinoma (ACC) by regulating key signaling pathways and tumor suppressors like MARCKS. This epigenetic insight offers potential new therapeutic targets for this rare cancer.

Area of Science:

  • Epigenetics
  • Genomics
  • Oncology

Background:

  • Adrenocortical carcinoma (ACC) is a rare malignancy with poor prognosis.
  • Current treatment options for ACC are limited.
  • Genomic studies identified TP53, WNT, and IGF pathway alterations in ACC.

Purpose of the Study:

  • To investigate the role of DNA methylation in ACC pathogenesis.
  • To identify novel epigenetic targets for ACC therapy.
  • To explore the relationship between DNA methylation and gene expression in ACC.

Main Methods:

  • Global DNA methylation analysis using the Infinium HumanMethylation450 BeadChip Array.
  • Assessment on 18 ACC tumors and 6 normal adrenal tissues.
  • Application of a novel discretization method to correlate DNA methylation and gene expression.

Main Results:

  • Epigenetic regulation of genes involved in TP53, WNT, and IGF signaling pathways was identified.
  • The tumor suppressor gene MARCKS was found to be silenced in ACC, a novel finding.
  • DNA methylation patterns correlate with gene expression in ACC.

Conclusions:

  • DNA methylation plays a significant role in the pathogenesis of adrenocortical carcinoma.
  • Epigenetic modifications affect key signaling pathways and tumor suppressors in ACC.
  • Understanding these epigenetic alterations may lead to new therapeutic strategies for ACC.

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