HOXA5 regulates hMLH1 expression in breast cancer cells

Sai Duriseti, Paul T. Winnard, Yelena Mironchik, Farhad Vesuna, Ana Raman, Venu Raman

Research output: Contribution to journalArticlepeer-review

Abstract

Homeobox protein HOXA5 functions as a transcriptional factor for genes that are not only involved in segmentation identity but also in cell differentiation. Although HOXA5 has been shown to regulate the expression of the tumor-suppressor protein p53, its role in breast tumorigenesis is not well understood. Using yeast as a model system, we now demonstrate that overexpression of HOXA5 in yeast can be used to identify downstream target genes that are homologous in humans. One such identified gene was that of the mismatch repair pathway component MutL homolog 1. Analysis of the promoter region of the gene for human MutL homolog 1 (hMLH1) displayed several putative HOXA5-binding sites. In transient transfection experiments, the overexpression of HOXA5 transactivated the hMLH1 promoter-reporter construct. In addition, chromatin immunoprecipitation assay using a human breast cancer cell line MCF-7 demonstrated that HOXA5 binds to the hMLH1 promoter in vivo. Furthermore, we demonstrate that, in the presence of HOXA5, there is an increase in in vivo repair activity in MCF-7 cells. Taken together, our results indicate that HOXA5 is a transcriptional regulator of hMLH1 in breast cancer cells.

Original languageEnglish (US)
Pages (from-to)250-258
Number of pages9
JournalNeoplasia
Volume8
Issue number4
DOIs
StatePublished - Apr 2006

Keywords

  • Breast cancer
  • Homeotic gene
  • Mismatch repair
  • Promoter analyses
  • Yeast

ASJC Scopus subject areas

  • Cancer Research

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