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A method for real time observation of photo-cleavage of stretched λDNA at single molecular level by a fluorescent microscope coupled with CCD is developed. DNA molecules stained with YOYO-1 are stretched by the mo-lecular combing technique and fixed on a modified slide. Then the process of photocleavage and relaxation of DNA under radiation of blue light is observed. We speculate that the conformation change of stretched DNA and the effect of water are likely to facilitate the effect of YOYO photocleav-age DNA molecules. The photocleavage effect of YOYO for stretched DNA may be useful to study DNA elasticity, cancer research as well as the interaction between DNA and dyes.
A method for real time observation of photo-cleavage of stretched λDNA at single molecular level by a fluorescent microscope coupled with CCD was developed. DNA molecules stained with YOYO-1 are stretched by the mo-lecular combing technique and fixed on a modified slide. Then the process of photocleavage and relaxation of DNA under radiation of blue light is observed. We speculate that the conformation change of stretched DNA and the effect of water are likely to facilitate the effect of YOYO photocleav-age DNA molecules. The photocleavage effect of YOYO for stretched DNA may be useful to study DNA elasticity, cancer research as well as the interaction between DNA and dyes.