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04/28/2003

To develop a novel nucleoside analogue for the effective recognition of CG interruption in a homopurine–homopyrimidine tract of double-stranded DNA (dsDNA), we succeeded in the synthesis of a triplex-forming oligonucleotide (TFO) containing a novel 20,40-BNA (QB) bearing 1-isoquinolone as a nucleobase, and the triplex-forming ability and sequence-selectivity of the TFO (TFO-QB) were examined. On melting temperature (Tm) measurements, it was found that the TFO-QB formed a stable triplex DNA in a highly sequence-selective manner under near physiological conditions. q 2003 Elsevier Science Ltd. All rights reserved.

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