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. 1999 Dec;153(4):1873–1883. doi: 10.1093/genetics/153.4.1873

Long inverted repeats are an at-risk motif for recombination in mammalian cells.

A S Waldman 1, H Tran 1, E C Goldsmith 1, M A Resnick 1
PMCID: PMC1460879  PMID: 10581292

Abstract

Certain DNA sequence motifs and structures can promote genomic instability. We have explored instability induced in mouse cells by long inverted repeats (LIRs). A cassette was constructed containing a herpes simplex virus thymidine kinase (tk) gene into which was inserted an LIR composed of two inverted copies of a 1.1-kb yeast URA3 gene sequence separated by a 200-bp spacer sequence. The tk gene was introduced into the genome of mouse Ltk(-) fibroblasts either by itself or in conjunction with a closely linked tk gene that was disrupted by an 8-bp XhoI linker insertion; rates of intrachromosomal homologous recombination between the markers were determined. Recombination between the two tk alleles was stimulated 5-fold by the LIR, as compared to a long direct repeat (LDR) insert, resulting in nearly 10(-5) events per cell per generation. Of the tk(+) segregants recovered from LIR-containing cell lines, 14% arose from gene conversions that eliminated the LIR, as compared to 3% of the tk(+) segregants from LDR cell lines, corresponding to a >20-fold increase in deletions at the LIR hotspot. Thus, an LIR, which is a common motif in mammalian genomes, is at risk for the stimulation of homologous recombination and possibly other genetic rearrangements.

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Selected References

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