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Genetics, Vol 129, 779-781, Copyright © 1991
INVESTIGATIONS |
The Effect of DNA Sequence Polymorphisms on Intragenic Recombination in the rosy Locus of Drosophila melanogaster
A. J. Hilliker, S. H. Clark and A. Chovnick
Department of Molecular Biology and Genetics, University of Guelph, Guelph, Ontario, Canada N1G 2W1
The effect of simple DNA sequence polymorphisms on intragenic recombination in the rosy locus of Drosophila melanogaster was assayed. Two crosses were performed involving nearly identical molecular distances between selective ry null mutations (3778 nucleotides and 3972 nucleotides). In one heterozygote (ry(606)/ry(531)), in addition to the nucleotide substitution ry(-) mutations, there were 11 simple nucleotide polymorphisms between the selective markers as well as additional flanking simple nucleotide polymorphisms within the rosy locus. In the other heterozygote (ry(606)/ry(609)), there were no additional polymorphisms because the two rosy nucleotide substitution mutations were induced on the same rosy isoallele (ry(+6)). From ry(606)/ry(531) heterozygous females, 27 intragenic crossovers and five marker conversions were seen among 4.53 X 10(5) progeny. From ry(606)/ry(609) heterozygous females, 23 intragenic crossovers and eight marker conversions were seen among 4.18 X 10(5) progeny. The intragenic crossover frequencies per kilobase of DNA were very similar, 1.6 X 10(-5) for ry(606)/ry(531) and 1.4 X 10(-5) for ry(606)/ry(609). Thus, simple DNA sequence polymorphisms neither inhibit nor promote intragenic recombination in D. melanogaster.
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