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Aberrant CBFA2T3B gene promoter methylation in breast tumors

Anthony J Bais1, Alison E Gardner, Olivia L D McKenzie

  • 1Bionomics Limited, Thebarton, Adelaide, SA 5031, Australia. abais@bionomics.com.au

Molecular Cancer
|August 11, 2004
PubMed
Abstract

Insights

Aberrant methylation of the CBFA2T3B gene promoter was found in breast tumors, correlating with reduced gene expression. This suggests CBFA2T3B acts as a tumor suppressor gene in breast cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • The CBFA2T3 locus on chromosome 16q24.3 is frequently deleted in breast tumors.
  • Aberrant CBFA2T3 gene expression is observed in breast tumor cell lines.
  • The CBFA2T3B isoform is a candidate tumor suppressor gene.

Purpose of the Study:

  • Investigate aberrant methylation of the CBFA2T3B promoter region.
  • Determine the correlation between CBFA2T3B promoter methylation and gene expression in breast tumors.

Main Methods:

  • Analysis of CBFA2T3B promoter methylation in breast tumor cell lines and primary tumors.
  • Quantification of methylation levels using a second-round real-time methylation-specific PCR assay.
  • Comparison of methylation status in tumor samples versus normal breast and blood samples.

Main Results:

  • Aberrant DNA methylation (both hypo- and hypermethylation) of the CBFA2T3B promoter was detected in breast tumors.
  • A significant inverse correlation was established between aberrant promoter methylation and CBFA2T3B gene expression.
  • Methylation patterns differed from normal breast and blood samples.

Conclusions:

  • CBFA2T3B functions as a potential tumor suppressor gene in breast cancer.
  • Aberrant promoter methylation is a key mechanism affecting CBFA2T3B expression in breast tumors.
  • Methylation analysis revealed both hypomethylation and hypermethylation, reflecting methodological aspects.

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