Abstract
The methylation of the promoter region of DNA is an important regulatory mechanism for the downstream gene expression, and the extent of methylation has been linked to cancer formation. In this study, we report a simple method to screen for the degree of DNA methylation by combined bisulfite restriction analysis (COBRA) and capillary electrophoresis with laser-induced fluorescence (CE-LIF). After treating genomic DNA with sodium bisulfite, nested-PCR amplification and endonuclease (Taq I) digestion were performed. The digested DNA fragments were then separated by capillary electrophoresis using 1.5% poly(ethylene) oxide (M(ave), 8,000,000 g/mol) in the presence of electroosmotic flow. The improvement for DNA amplification using the nested PCR described here corresponded to approximately ten cells. In addition, the level of DNA methylation shown in the electropherograms obtained corresponded to the original percentage of DNA methylation from commercial available standard sample (0-100%). The electrophoretic patterns demonstrated that the six cancer cell lines tested displayed different degrees of DNA methylation and could be differentiated by hierarchical cluster analysis. Furthermore, the DNA methylation level was eliminated af...Continue Reading
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Sep 17, 2014·Analytical Chemistry·Abu Ali Ibn SinaMatt Trau
Aug 20, 2016·Lab on a Chip·Ryoji Kurita, Osamu Niwa
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