A method for characterizing nucleic acid molecules which involves generating extendible upstream DNA fragments which result from the cleavage of nucleic acid at an abasic site

摘要

The present invention is drawn to a method for characterising nucleic acid molecules, which comprises the steps of: i) introducing a modified base which is a substrate for a DNA glycosylase into a DNA molecule; ii) excising the modified base with the DNA glycosylase to generate an abasic site; iii) cleaving the DNA at the abasic site to generate and release an extendible upstream DNA fragment having a 3' hydroxyl terminus; and iv) incubating the released extendible upstream DNA fragment in the presence of an enzyme allowing for extension thereof and an additional template nucleic acid and analysing resultant fragment(s).