Abstract
ABSTRACTWe developed a practical and reliable method for synthesizing an abasic deoxyribonucleoside, 1,2-dideoxy-d-ribofuranose (dRH) via elimination of nucleobase from thymidine. To synthesize oligonucleotides bearing dRH by the standard phosphoramidite solid-phase method, dRH was converted to the corresponding phosphoramidite derivative and linked to a solid support (controlled pore glass resin). Chemically modified small interfering RNAs (siRNAs) possessing dRH at their 3′-overhang regions were synthesized. Introducing dRH to the 3′-end of the antisense strand of siRNA reduced its knockdown effect.
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