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J Cancer Res Clin Oncol. 2010 Aug;136(8):1267-73. doi: 10.1007/s00432-010-0777-z. Epub 2010 Jan 29.

Semi-quantitative detection of GADD45-gamma methylation levels in gastric, colorectal and pancreatic cancers using methylation-sensitive high-resolution melting analysis.

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JNU-HKUST Joint Lab, Jinan University, Guangdong, China.



GADD45 is a family of proteins involved in DNA damage response and cell growth arrest. GADD45G was identified as an interleukin-2-induced immediate-early gene, and methylation of GADD45G was studied in various tumor cell lines and a few primary tumor samples. High-resolution melting (HRM) analysis has been used as a novel tool for analysis of promoter methylation.


In our study, we used HRM analysis to detect the methylation levels of GADD45G gene in 100 gastric cancers, 100 colorectal cancers, 70 pancreatic cancers and equal number of adjacent normal tissues.


The frequency of GADD45G methylation in all three types of cancers was significantly higher than that in normal tissues. Consistent with previous reports, expression levels of GADD45G were inversely correlated with methylation levels. But we did not find significant association between GADD45G methylation status and TNM staging in all three types of cancers.


In summary, application of HRM analysis to large amount of clinical samples proves to be a fast and high-throughput way to investigate the epigenetic status of GADD45G. And this is the first study to evaluate the prevalence of GADD45G methylation based on large amount of tumor samples, showing that epigenetic regulation of GADD45G was associated with carcinogenesis.

[Indexed for MEDLINE]

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