N-(2-Hydroxyethyl)phenazinium derivatives of oligonucleotides as effectors of the sequence-specific modification of nucleic acids with reactive oligonucleotide derivatives

It has been found that mono- and especially diphenazinium derivatives of oligonucleotides complementary to the DNA sequence adjacent to the target sequence of the addressed alkylation of DNA, significantly enhance the extent and specificity of alkylation with p-( N-2-chloroethyl- N-methylamino)benzylamide derivatives of the addressing oligonucleotides, thus playing the role of effector of the sequence-specific (complementary addressed) modification.