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Departments of Chemical Pathology [Y. M. D. L., J. Z., M. S. C. T., N. M. H.] and Anatomical and Cellular Pathology [I. H. N. W., M. H. L. N.], The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, New Territories, Hong Kong Special Administrative Region
We have developed a quantitative method for methylation analysis of the p16 gene based on real-time methylation-specific PCR (MSP). Real-time MSP is sensitive enough to detect down to 10 genome equivalents of the methylated p16 sequence. Application of real-time MSP to DNA from tumor-derived cell lines revealed complete concordance with conventional MSP analysis. Quantitative data generated by real-time MSP were expressed as the methylation index, which was defined as the percentage of bisulfite-converted DNA that consisted of methylated target sequences. The methylation index was shown to be inversely correlated with p16 gene transcription during demethylation treatment of cell lines with 5-aza-2'-deoxycytidine. The application of real-time MSP to bone marrow aspirates from patients with multiple myeloma revealed complete concordance with conventional MSP analysis. Real-time quantitative MSP may have applications in elucidating diverse biological processes involving DNA methylation and may become a valuable diagnostic tool for detecting tumor-associated epigenetic changes in cancer patients.
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