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Originally published as Genetics Published Articles Ahead of Print on September 30, 2004.
Genetics, Vol. 168, 1891-1898, December 2004, Copyright © 2004
doi:10.1534/genetics.104.034280
Swi5 Acts in Meiotic DNA Joint Molecule Formation in Schizosaccharomyces pombe
Chad Ellermeier*,
Henning Schmidt
and
Gerald R. Smith*,1
* Fred Hutchinson Research Cancer Center, Seattle, Washington 98109
Institut für Genetik, University of Braunschweig, D-38106 Braunschweig, Germany
1 Corresponding author: Fred Hutchinson Cancer Research Center, 1100 Fairview Ave. North, P.O. Box 19024, Seattle, WA 98109.
E-mail: gsmith{at}fhcrc.org
Previously isolated Schizosaccharomyces pombe swi5 mutants are defective in mitotic mating-type switching and in repair of meiotic recombination-related DNA double-strand breaks. Here, we identify the swi5 gene, which encodes an 85-amino-acid polypeptide, similar to Sae3 of Saccharomyces cerevisiae, with an N-terminal predicted coiled-coil domain. A swi5 complete deletion mutant had normal mitotic growth rate but was hypersensitive to DNA-damaging agents and defective in mating-type switching. In meiosis, recombinant frequencies were reduced by a factor of 
10. The swi5 deletion strongly reduced the viable spore yields of mutants lacking Rhp55 or Rhp57, proteins thought to aid joint molecule formation. Furthermore, the swi5 deletion strongly suppressed the low viable spore yield of mutants lacking Mus81•Eme1, which resolves joint molecules such as Holliday junctions. These and previous results indicate that the small Swi5 polypeptide acts in a branched pathway of joint molecule formation to repair meiotic DNA breaks.
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