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Science 18 September 1987:
Vol. 237. no. 4821, pp. 1459 - 1465
DOI: 10.1126/science.2820060
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Articles

Science, Vol 237, Issue 4821, 1459-1465
Copyright © 1987 by American Association for the Advancement of Science

articles

Meiotic recombination in yeast: alteration by multiple heterozygosities

RH Borts and JE Haber

Although meiotic gene conversion has long been known to be accompanied by crossing-over, a direct test of the converse has not been possible. An experiment was designed to determine whether crossing-over is accompanied by gene conversion in Saccharomyces cerevisiae. Nine restriction site heterologies were introduced into a 9-kilobase chromosomal interval that exhibits 22 percent crossing-over. Of all the exchange events that occurred, at least 59 percent of meiotic crossovers are accompanied by gene conversion of one or more of the restriction site heterologies. The average gene conversion tract length was 1.5 kilobases. An unexpected result was that the introduction of as few as seven heterozygosities significantly altered the outcome of recombination events, reducing the frequency of crossovers by 50 percent and increasing the number of exceptional tetrads. This alteration results from a second recombination event induced by repair of heteroduplex DNA containing multiple mismatched base pairs.


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