Abstract
The efficiency of osmium complex formation at 5-methylcytosine in mismatched DNA duplexes is a key point for the design of sequence-specific detection of DNA methylation. Osmium complexation was not observed in fully matched duplexes, whereas the complexation site and efficiency in mismatched duplexes changed depending on the type of 5'-neighboring base of the 5-methylcytosine forming a mismatched base pair. In particular, when the base adjacent to the 5' side of the mismatched base pair was thymine, a unique "side reaction" was observed. However, the nature of the mismatched base pairs in the reaction site did not influence the selectivity of osmium complex formation with methylated DNA.
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