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We here report the synthesis of novel modified nucleic acid containing a formyl group and the evaluation of interstrand cross-linking between the modified DNA and the complementary strand. The synthesis of the formyl-containing oligodeoxynucleotide (ODN) was achieved by a post synthetic modification of corresponding ODN containing a 1,2-diol. The ODN containing the diol moiety was successfully synthesized by a standard phosphoramidite method, and was quantitatively converted to the desired formyl-containing ODN by sodium periodate oxidation. Hybridizaiton of the formyl ODN and the complementary ODN produced the interstrand cross-link between the formyl group and N(6)-exocyclic amino group of adenine.

DNA cross-link generated by a novel modified DNA containing a formyl group