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Breast Cancer Research
Published in: Breast Cancer Research 4/2008

Open Access 01-08-2008 | Research article

Epigenetic mapping and functional analysis in a breast cancer metastasis model using whole-genome promoter tiling microarrays

Authors: David I Rodenhiser, Joseph Andrews, Wendy Kennette, Bekim Sadikovic, Ariel Mendlowitz, Alan B Tuck, Ann F Chambers

Published in: Breast Cancer Research | Issue 4/2008

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Abstract

Introduction

Breast cancer metastasis is a complex, multi-step biological process. Genetic mutations along with epigenetic alterations in the form of DNA methylation patterns and histone modifications contribute to metastasis-related gene expression changes and genomic instability. So far, these epigenetic contributions to breast cancer metastasis have not been well characterized, and there is only a limited understanding of the functional mechanisms affected by such epigenetic alterations. Furthermore, no genome-wide assessments have been undertaken to identify altered DNA methylation patterns in the context of metastasis and their effects on specific functional pathways or gene networks.

Methods

We have used a human gene promoter tiling microarray platform to analyze a cell line model of metastasis to lymph nodes composed of a poorly metastatic MDA-MB-468GFP human breast adenocarcinoma cell line and its highly metastatic variant (468LN). Gene networks and pathways associated with metastasis were identified, and target genes associated with epithelial–mesenchymal transition were validated with respect to DNA methylation effects on gene expression.

Results

We integrated data from the tiling microarrays with targets identified by Ingenuity Pathways Analysis software and observed epigenetic variations in genes implicated in epithelial–mesenchymal transition and with tumor cell migration. We identified widespread genomic hypermethylation and hypomethylation events in these cells and we confirmed functional associations between methylation status and expression of the CDH1, CST6, EGFR, SNAI2 and ZEB2 genes by quantitative real-time PCR. Our data also suggest that the complex genomic reorganization present in cancer cells may be superimposed over promoter-specific methylation events that are responsible for gene-specific expression changes.

Conclusion

This is the first whole-genome approach to identify genome-wide and gene-specific epigenetic alterations, and the functional consequences of these changes, in the context of breast cancer metastasis to lymph nodes. This approach allows the development of epigenetic signatures of metastasis to be used concurrently with genomic signatures to improve mapping of the evolving molecular landscape of metastasis and to permit translational approaches to target epigenetically regulated molecular pathways related to metastatic progression.
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Metadata
Title
Epigenetic mapping and functional analysis in a breast cancer metastasis model using whole-genome promoter tiling microarrays
Authors
David I Rodenhiser
Joseph Andrews
Wendy Kennette
Bekim Sadikovic
Ariel Mendlowitz
Alan B Tuck
Ann F Chambers
Publication date
01-08-2008
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 4/2008
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr2121

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