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Structure and Function of Biopolymers
Theoretical analysis of addressed modification of DNA
- Institute of Bioorganic Chemistry, Siberian Branch of the Academy of Sciences of the USSR
- Institute of Molecular Genetics, Academy of Sciences of the USSR
Specific chemical addressed modification of DNA involves treatment of single-stranded DNA by oligonucleotides complementary to certain target sequences in this DNA and bearing groupings reactive towards the DNA bases. The binding with the partially complementary targets can cause non-specific modification. The selectivity of the addressed modification is the subject of the present investigation. Modification of a fragment is analyzed which is flanked by two target sequences complementary to a given oligonucleotide address and contains no more such exact targets over all its length. Conditions of maximum ratio between specific and non-specific modification are calculated. The probability of the process in which up to the given time both of the target termini will be specifically modified without any non-specific modification of the internal part of a fragment is determined.
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