Method for detecting methylation of promoter using restriction enzyme and DNA chip

A method for detecting the methylation of promoters using HpaII, a methylation-sensitive restriction enzyme. In such method, DNAs, derived from clinical samples or subjects to be diagnosed, are cut with HpaII, the cut DNAs are amplified by PCR with primers capable of amplifying CpG islands, and the presence or absence of the PCR amplification products is determined using a DNA chip for methylation detection. Unlike prior approaches, the inventive method allows the methylation of gene promoters to be detected in a simple and economical manner, and thus is useful for the diagnosis of diseases such as cancer that are characterized by methylation of gene promoters.