The Meiotic Recombination Hot-Spot ura4A in Schizosaccharomyces pombe

Baur, M., Hartsuiker, E., Lehmann, E., Ludin, K., Munz, P. and Kohli, J. (2004) The Meiotic Recombination Hot-Spot ura4A in Schizosaccharomyces pombe. Genetics. ISSN 0016-6731

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Abstract

A meiotic recombination hot spot ura4A (formerly ura4-aim) of Schizosaccharomyces pombe was observed at the insertion of the ura4+ gene 15 kb centromere-proximal to ade6 on chromosome III. Crosses heterozygous for the insertion showed frequent conversion at the heterology with preferential loss of the insertion. This report concerns the characterization of 12 spontaneous ura4A mutants. A gradient of conversion ranging from 18% at the 5' end to 6% at the 3' end was detected. A novel phenomenon was discovered: a mating-type related bias of conversion. The allele entering with the h+ parent acts preferentially as the acceptor for conversion (ratio of 3:2). Tetrad analysis of two-factor crosses showed that heteroduplex DNA is predominantly asymmetrical, enters from the 5' end, and more often than not covers the entire gene. Restoration repair of markers at the 5' end was inferred. Random spore analyses of two-factor crosses and normalization of prototroph-recombinant frequencies to physical distance led to the demonstration of map expansion: Crosses involving distant markers yielded higher recombinant frequencies than the sum of the frequencies measured in the subintervals. Finally, marker effects on recombination were defined for two of the ura4A mutations.

Item Type: Article
Additional Information: 0016-6731 Journal article GDSC114
Schools and Departments: School of Life Sciences
Depositing User: Gee Wheatley
Date Deposited: 20 Mar 2007
Last Modified: 30 Nov 2012 16:51
URI: http://sro.sussex.ac.uk/id/eprint/994
Google Scholar:5 Citations
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