A systematic investigation of a series of triplex forming oligonucleotides
(TFOs) containing alpha-, and beta- thymidine, alpha- and beta -N7-hypoxant
hine, and alpha- and beta- N7 and N9 aminopurine nucleosides. designed to b
ind to T-A inversion sites in DNA target sequences was performed. Data obta
ined from gel mobility assays indicate that T-A recognition in the antipara
llel triple-helical binding motif is possible if the nucleoside alpha N9-am
inopurine is used opposite to the inversion site in the TFO.