Artificial nucleic acid cleavage agents have attracted close attention beca
use they play important roles in biochemistry and molecular biology. Accord
ing to the cleavage mechanism of nucleic acid, they are divided into three
types, namely free radical, phosphodiester bond hydrolysis and elimination
cleavage agents. In this review, a series of cleavage agents, including the
site- and sequence-specific ones, are illustrated, and some suggestions fo
r the future researches in this field are also put forward.