Identification of primary gene targets of TFAP2C in hormone responsive breast carcinoma cells.

Genes, Chromosomes & Cancer
George W WoodfieldRonald J Weigel

Abstract

The TFAP2C transcription factor is involved in mammary development, differentiation, and oncogenesis. Previous studies established a role for TFAP2C in the regulation of ESR1 (ERalpha) and ERBB2 (Her2) in breast carcinomas. However, the role of TFAP2C in different breast cancer phenotypes has not been examined in detail. To develop a more complete characterization of TFAP2C target genes, ChIP-seq with anti-TFAP2C antibody and expression arrays with TFAP2C knock down were analyzed in MCF-7 breast carcinoma cells. Genomic sequences common to the ChIP-seq data set defined the consensus sequence for TFAP2C chromatin binding as the nine base sequence SCCTSRGGS (S = G/C, r = A/G), which closely matches the previously defined optimal in vitro binding site. Comparing expression arrays before and after knock down of TFAP2C with ChIP-seq data demonstrated a conservative estimate that 8% of genes altered by TFAP2C expression are primary target genes and includes genes that are both induced and repressed by TFAP2C. A set of 447 primary target genes of TFAP2C was identified, which included ESR1 (ERalpha), FREM2, RET, FOXA1, WWOX, GREB1, MYC, and members of the retinoic acid response pathway. The identification of ESR1, WWOX, GREB1, and FOXA...Continue Reading

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Jul 16, 2013·Nature Cell Biology·Erna MagnúsdóttirM Azim Surani
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