PMID: 9545491May 8, 1998Paper

Factors affecting ectopic gene conversion in mice

Mammalian Genome : Official Journal of the International Mammalian Genome Society
D M CooperJ C Schimenti

Abstract

Duplicated genes and repetitive sequences are distributed throughout the genomes of complex organisms. The homology between related sequences can promote nonallelic (ectopic) recombination, including gene conversion and reciprocal exchange. Resolution of these events can result in translocations, deletions, or other harmful rearrangements. In yeast, ectopic recombination between sequences on nonhomologous chromosomes occurs at high frequency. Because the mammalian genome is replete with duplicated sequences and repetitive elements, high levels of ectopic exchange would cause aneuploidy and genome instability. To understand the factors regulating ectopic recombination in mice, we evaluated the effects of homology length on gene conversion between unlinked sequences in the male germline. Previously, we found high levels of gene conversion between lacZ transgenes containing 2557 bp of homology. We report here that genetic background can play a major role in ectopic recombination; frequency of gene conversion was reduced by more than an order of magnitude by transferring the transgenes from a CF1 strain background to C57BL/6J. Additionally, conversion rates decreased as the homology length decreased. Sequences sharing 1214 bp of se...Continue Reading

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