Abstract
A method for in vivo studying the fidelity of DNA double-strand break (DSB) repair in bacteriophage T4 has been developed. The frequency of reversion of rII mutations to the wild phenotype was measured in i segC + × i ets1 segCΔ crosses, where ets1 is an insertion in the initial part of the rIB gene carrying a sequence recognized by SegC endonuclease; i designates a rIIB or rIIA mutation located at some distance from ets1, and segCΔ is a deletion in the segC gene. In such cross, a DSB occurs in the site of ets1. Their repair involves genetic recombination and DNA replication in the neighborhood of ets1. In parallel, the frequency of reversion of the same i mutant in the absence of DSBs is measured in i × i self-crosses. Reversions of different types (base substitutions, deletions, insertions) can be studied with the use of structurally different i mutations located at varying distances from ets1. The reversion frequencies were determined for three rIIB mutations and one rIIA mutation. The results obtained suggest that DSB repair in bacteriophage T4 is a process of high fidelity with the rate of errors that does not essentially exceed that in the case of usual phage multiplication.
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Original Russian Text © V.P. Shcherbakov, S.T. Sizova, T.S. Shcherbakova, I.E. Granovsky, K.Yu. Popad’in, 2008, published in Genetika, 2008, Vol. 44, No. 9, pp. 1178–1183.
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Shcherbakov, V.P., Sizova, S.T., Shcherbakova, T.S. et al. In vivo study of fidelity of DNA double-strand break repair in bacteriophage T4. Russ J Genet 44, 1025–1030 (2008). https://doi.org/10.1134/S1022795408090032
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DOI: https://doi.org/10.1134/S1022795408090032