Patents

The invention provides novel chiral serinyl functionalized tethered oligunucleotides i.e. R/S serinyl functionalized tethered oligonucleotides and the process of preparation thereof. Specifically, the invention provides a modified nucleoside unit containing the R/S serinyl derivative at 2''of the sugar unit which is introduced in a nucleotide sequence. Also, capping of the oligonucleotides with abasic serinyl derivative to render the nuclease stability to the oligonucleotiedds is also disclosed. The chiral serinyl functionalized tethered oligonucleotides, 2'-O-[R/S-(2-amino-3-methoxy)propyl] nucleic acids with both '3- and 5'-ends capped with two units of abasic serine have antisense activity against the miRNA.