Gene Set: WANG_METHYLATED_IN_BREAST_CANCER

Standard name WANG_METHYLATED_IN_BREAST_CANCER
Systematic name M9951
Brief description Genes up-regulated in MDA468 cells (breast cancer) vs DU99 cells (normal breast) after treatment with azacytidine [PubChem=9444].
Full description or abstract Treatment of the breast cancer cell line, MDAMB468 with the DNA methylation inhibitor, 5-azacytidine (5-AzaC) results in growth arrest, whereas the growth of the normal breast epithelial line DU99 (telomerase immortalized) is relatively unaffected. Comparing gene expression profiles of these two lines after 5-AzaC treatment, we identified 36 genes that had relatively low basal levels in MDAMB468 cells compared to the DU99 line and were induced in the cancer cell line but not in the normal breast epithelial line. Of these genes, 33 have associated CpG islands greater than 300 bp in length but only three have been previously described as targets for aberrant methylation in human cancer. Northern blotting for five of these genes (alpha-Catenin, DTR, FYN, GADD45a, and Zyxin) verified the array results. Further analysis of one of these genes, GADD45a, showed that 5-AzaC induced expression in five additional breast cancer cell lines with little or no induction in three additional lines derived from normal breast epithelial cells. The CpG island associated with GADD45a was analysed by bisulfite sequencing, sampling over 100 CpG dinucleotides. We found that four CpG's, located approximately 700 bp upstream of the transcriptional start site are methylated in the majority of breast cancer cell lines and primary tumors but not in DNA from normal breast epithelia or matched lymphocytes from cancer patients. Therefore, this simple method of dynamic transcriptional profiling yielded a series of novel methylation-sensitive genes in breast cancer including the BRCA1 and p53 responsive gene, GADD45a.
Collection C2: curated gene sets
      CGP: chemical and genetic perturbations
Source publication Pubmed 15735726   Authors: Wang W,Huper G,Guo Y,Murphy SK,Olson JA Jr,Marks JR
Exact source Table 1
Related gene sets (show 41 gene sets from the same authors)
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Organism Homo sapiens
Contributed by Leona Saunders (Broad Institute)
Source platform HUMAN_GENE_SYMBOL
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Compendia expression profiles Human tissue compendium (Novartis)
NCI-60 cell lines (National Cancer Institute)
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Version history 3.0: First introduced

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