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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
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MAGEB2 is activated by promoter demethylation in head and neck squamous cell carcinoma

Kavita M Pattani1, Ethan Soudry, Chad A Glazer

  • 1Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, MD, USA.

Plos One
|October 3, 2012
PubMed
Abstract

Insights

Proto-oncogene activation via promoter demethylation is rare. This study identified MAGEB2 as demethylated and overexpressed in head and neck cancer, promoting cell growth.

Area of Science:

  • Oncology
  • Epigenetics
  • Molecular Biology

Background:

  • Promoter hypermethylation typically silences tumor suppressor genes.
  • Proto-oncogene activation by promoter demethylation is less understood in cancer.

Purpose of the Study:

  • To discover epigenetically activated proto-oncogenes in head and neck squamous cell carcinoma (HNSCC) using whole-genome analysis.
  • To investigate the role of promoter demethylation in HNSCC pathogenesis.

Main Methods:

  • Whole-genome analysis of HNSCC tissues and normal mucosa.
  • Affymetrix expression microarray and bisulfite sequencing.
  • Quantitative methylation-specific PCR (QMSP) and RT-PCR for candidate gene validation.
  • Functional studies on MAGEB2 in oral keratinocyte cell lines.

Main Results:

  • Identified MAGEB2 with significant promoter demethylation in HNSCC tissues.
  • Found significantly higher MAGEB2 expression in HNSCC tumors compared to normal tissues.
  • MAGEB2 demonstrated growth-promoting effects in minimally transformed oral keratinocytes.

Conclusions:

  • MAGEB2 is activated by promoter demethylation in HNSCC.
  • MAGEB2 exhibits growth-promoting activity in early-stage oral cells.
  • Further research is required to elucidate MAGEB2's precise role in HNSCC progression.

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