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. 2001 Aug;158(4):1665–1674. doi: 10.1093/genetics/158.4.1665

Capture of DNA sequences at double-strand breaks in mammalian chromosomes.

Y Lin 1, A S Waldman 1
PMCID: PMC1461771  PMID: 11514454

Abstract

To study double-strand break (DSB)-induced mutations in mammalian chromosomes, we transfected thymidine kinase (tk)-deficient mouse fibroblasts with a DNA substrate containing a recognition site for yeast endonuclease I-SceI embedded within a functional tk gene. To introduce a genomic DSB, cells were electroporated with a plasmid expressing endonuclease I-SceI, and clones that had lost tk function were selected. Among 253 clones analyzed, 78% displayed small deletions or insertions of several nucleotides at the DSB site. Surprisingly, approximately 8% of recovered mutations involved the capture of one or more DNA fragments. Among 21 clones that had captured DNA, 10 harbored a specific segment of the I-SceI expression plasmid mapping between two replication origins on the plasmid. Four clones had captured a long terminal repeat sequence from an intracisternal A particle (an endogenous retrovirus-like sequence) and one had captured what appears to be a cDNA copy of a moderately repetitive B2 sequence. Additional clones displayed segments of the tk gene and/or microsatellite sequences copied into the DSB. This first systematic study of DNA capture at DSBs in a mammalian genome suggests that DSB repair may play a considerable role in the evolution of eukaryotic genomes.

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Selected References

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