Systematic optimization and modification of a DNA aptamer with 2'-O-methyl RNA analogues

ChemistrySelect. 2017 Mar 1;2(7):2335-2340. doi: 10.1002/slct.201700359. Epub 2017 Mar 6.


Nucleic acid aptamers (NAAs) are short synthetic DNA or RNA molecules that specifically fold into distinct three-dimensional structures able to specifically recognize a target. While NAAs show unprecedented promise in a variety of applications, including sensing, therapeutics and diagnostics, one major limitation involves the lack of stability towards omnipresent nucleases. Therefore, we herein report a systematic truncation and incorporation of 2'-O-methyl bases to a DNA aptamer, which results in increased stability without affecting affinity. One of the newly designed analogues is stable up to 24 hours, demonstrating that 2'-O-methyl RNA is an attractive modification to DNA aptamers, especially when therapeutic applications are intended.

Keywords: 2′-O-methyl RNA; Aptamer; DNA; serum; stability.