Method for Reducing Adapter-Dimer Formation

摘要

Methods are provided for ligating a 3' adapter and a 5' adapter to a target polynucleotide so as to avoid adapter dimer formation. Embodiments of the methods include adding a blocking oligonucleotide after the first ligation in which a 3' adapter is ligated to the target polynucleotide so that the blocking oligonucleotide is capable of hybridizing to excess 3' adapter and the ligated 3' adapter. Subsequently, a 5' adapter is ligated to the target polynucleotide thus avoiding adapter dimer formation.