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. 1994 Sep;14(9):5794–5803. doi: 10.1128/mcb.14.9.5794

Illegitimate recombination induced by DNA double-strand breaks in a mammalian chromosome.

J W Phillips 1, W F Morgan 1
PMCID: PMC359105  PMID: 8065314

Abstract

We examined DNA double-strand-break-induced mutations in the endogenous adenine phosphoribosyl-transferase (APRT) gene in cultured Chinese hamster ovary cells after exposure to restriction endonucleases. PvuII, EcoRV, and StuI, all of which produce blunt-end DNA double-strand breaks, were electroporated into CHO-AT3-2 cells hemizygous at the APRT locus. Colonies of viable cells containing mutations at APRT were expanded, and the mutations that occurred during break repair were analyzed at the DNA sequence level. Restriction enzyme-induced mutations consisted of small deletions of 1 to 36 bp, insertions, and combinations of insertions and deletions at the cleavage sites. Most of the small deletions involved overlaps of one to four complementary bases at the recombination junctions. Southern blot analysis revealed more complex mutations, suggesting translocation, inversion, or insertion of larger chromosomal fragments. These results indicate that blunt-end DNA double-strand breaks can induce illegitimate (nonhomologous) recombination in mammalian chromosomes and that they play an important role in mutagenesis.

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Selected References

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