[Structure: see text] We describe a synthetic route for incorporating a photocleavable (PC) DABSYL moiety and fluorescein at adjacent cytidines in the middle of a 25-mer oligodeoxynucleotide. In hybridization studies, both fluorescein and the photocleavable DABSYL reduced the Tm about 6 degrees C separately. UV irradiation (355 nm, 2 min) removed the PC-DABSYL moiety, which increased the fluorescence intensity 51-fold and restored the melting temperature. Caged fluorescent oligodeoxynucleotides (CFOs) will allow many DNA processes to be controlled with light.
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Tang et al. (2004) studied this question.
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