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. 1986 May;6(5):1787–1795. doi: 10.1128/mcb.6.5.1787

Foreign DNA introduced by calcium phosphate is integrated into repetitive DNA elements of the mouse L cell genome.

S Kato, R A Anderson, R D Camerini-Otero
PMCID: PMC367708  PMID: 3023904

Abstract

We investigated the sites of integration of exogenous DNA fragments introduced by DNA-mediated gene transfer. Mouse Ltk- cells were transformed with the herpes simplex virus thymidine kinase gene and pBR322 DNA by the calcium phosphate precipitation method. Some of the integrated exogenous DNA sequences were recovered from the stable tk+ transformants in the form of plasmids that were capable of propagation in bacteria. Four plasmids derived from two cloned cell lines were analyzed in detail by nucleotide sequencing and hybridization techniques. These plasmids contained a total of seven cellular-exogenous DNA junctions. In all cases, there was no sequence homology between the exogenous and cellular DNA sequences adjacent to the joining sites, and no specific exogenous or cellular sequences occurred at the junctions. Rearrangement or deletion of Ltk- DNA was always associated with the integration of exogenous DNA. All of the assignable cellular sequences at the junctions were repetitive sequences. Two of these sequences were from the MIF-1 repetitive sequence family, and a third consisted of a 40-base pair simple copolymer of alternating deoxyadenosine-deoxythymidine. Our results suggest that repetitive sequences are relatively favorable sites for the integration of exogenous DNA.

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