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Mol. Cell. Biol., 01 1997, 267-277, Vol 17, No. 1
RG Sargent, MA Brenneman and JH Wilson
In mammalian cells, chromosomal double-strand breaks are efficiently
repaired, yet little is known about the relative contributions of
homologous recombination and illegitimate recombination in the repair
process. In this study, we used a loss-of-function assay to assess the
repair of double-strand breaks by homologous and illegitimate
recombination. We have used a hamster cell line engineered by gene
targeting to contain a tandem duplication of the native adenine
phosphoribosyltransferase (APRT) gene with an I-SceI recognition site in
the otherwise wild-type APRT+ copy of the gene. Site-specific double-
strand breaks were induced by intracellular expression of I-SceI, a
rare-cutting endonuclease from the yeast Saccharomyces cerevisiae. I- SceI
cleavage stimulated homologous recombination about 100-fold; however,
illegitimate recombination was stimulated more than 1,000- fold. These
results suggest that illegitimate recombination is an important competing
pathway with homologous recombination for chromosomal double-strand break
repair in mammalian cells.
Copyright © 1997, American Society for Microbiology
Repair of site-specific double-strand breaks in a mammalian chromosome by homologous and illegitimate recombination
Verna and Marrs McLean Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030, USA.
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