Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/8917
Title: Mismatch Repair-Induced Meiotic Recombination Requires the PMS1 Gene Product
Authors: Borts, Rhona H.
Leung, Wai-Ying
Kramer, Wilfried
Kramer, Barbara
Williamson, Marsha
Fogel, Seymour
Haber, James E.
First Published: Mar-1990
Publisher: Genetics Society of America
Citation: Genetics, 1990, 124(3), pp.573-584.
Abstract: The presence of multiple heterologies in a 9-kilobase (kb) interval results in a decrease in meiotic crossovers from 26.0% to 10.1%. There is also an increase from 3.5% to 11.1% in gene conversions and ectopic recombinations between the flanking homologous MAT loci. The hypothesis that mismatch repair of heteroduplex DNA containing several heterologies would lead to a second round of recombination has now been tested by examining the effect of a mutation that reduces mismatch correction. The repair-defective pms1-1 allele restores the pattern of recombination to nearly that seen in congenic diploids without the heterologies. Mismatch repair-induced recombination causes a significant increase in MAT conversions and ectopic recombination events with as few as two heterozygosities separated by 0.3-0.7 kb, but not when the mismatches are separated by greater than 1 kb. The frequency of these events depends on both the number and position of the heterozygosities relative to the flanking homologous MAT loci used to detect the events. The creation of recombinogenic lesions by mismatch repair in yeast could be analogous to the creation of recombinogenic lesions in dam(-) Escherichia coli. We suggest that the repair of heteroduplex DNA containing multiple mismatches may produce chromosomal rearrangements and gamete inviability when naturally polymorphic chromosomes undergo meiotic recombination.
ISSN: 0016-6731 (Print)
1943-2361 (Online)
Links: http://hdl.handle.net/2381/8917
http://www.genetics.org/
Type: Article
Description: Full-text of this article is not available on the LRA. The published version of this article can be found on the publisher's website: http://www.genetics.org/
Appears in Collections:Published Articles, Dept. of Genetics

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