Method for detecting target nucleic acid sequence using cleaved complementary tag fragment and a composition therefor

Abstract

The present invention relates to a method and a composition for detecting a target nucleic acid sequence using a cleaved complementary tag fragment. Specifically, the present invention relates to a method for linking a complementary tag sequence to a PCR primer so that a tagging can be produced by a restriction enzyme during a PCR reaction, diversifying the complementary tag sequence to be linked to each primer by utilizing factors such as length and nucleic acid combination, etc., and distinguishing the target sequence using the same. According to the present invention, a cleaved complementary tag fragment (CCTF) under stringent conditions is a complementary sequence to any sequence at the 5' end linked to the primer and cannot be formed unless a PCR reaction and a restriction enzyme reaction occur, and the cleaved single strand is formed only when hybridization to the target sequence occurs and a primer extension product complementary to the target sequence is formed, so as to have a higher degree of accuracy secured by reading the cleaved single strand. In addition, the CCTF can be used to identify a plurality of target nucleic acid sequences by selecting various analytical techniques and analysis equipment according to a user's intention. For example, a result can be confirmed rapidly and accurately in genetic testing, identification of organisms in a sample, diagnosis of microbial or viral infection, etc.