Current Genetics

, Volume 45, Issue 1, pp 37–44 | Cite as

The Neurospora crassa mus-19 gene is identical to the qde-3 gene, which encodes a RecQ homologue and is involved in recombination repair and postreplication repair

  • Akihiro Kato
  • Yufuko Akamatsu
  • Yoshiyuki Sakuraba
  • Hirokazu InoueEmail author
Research Article


An allele called mus-19 was identified by screening temperature-sensitive and mutagen-sensitive mutants of Neurospora crassa. The mus-19 gene was genetically mapped to a region near the end of the right arm of linkage group I, where a RecQ homologue called qde-3 had been physically mapped in the Neurospora database. Complementation tests between the mus-19 mutant and the qde-3 RIP mutant showed that mus-19 and qde-3 were the same gene. The qde-3 genes of both mutants were cloned and sequenced; and the results showed that they have mutation(s) in their qde-3 genes. The original mus-19 and qde-3 RIP mutants are defective in quelling, as reported for other qde-3 mutants. The mutants show high sensitivity to methyl methanesulfonate, ethyl methanesulfonate, N-methyl-N′-nitro-N-nitrosoguanidine, tert-butyl hydroperoxide, 4-nitroquinoline-1-oxide, hydroxyurea and histidine. Epistasis analysis indicated that the qde-3 gene belongs both to the uvs-6 recombination repair pathway and the uvs-2 postreplication repair pathway. The qde-3 mutation has no effect on the integration of a plasmid carrying the mtr gene by homologous recombination. In homozygous crosses, the qde-3 mutant is defective in ascospore production.


RecQ DNA repair Recombination Replication 



This work was supported by a Grant-in-Aid for Scientific Research (C) from the Japan Society for the Promotion of Science. The authors thank Hiroshi Iwasaki for his help in sequencing and George R. Hoffmann for his kind review of this paper.


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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Akihiro Kato
    • 1
  • Yufuko Akamatsu
    • 1
    • 2
  • Yoshiyuki Sakuraba
    • 1
    • 3
  • Hirokazu Inoue
    • 1
    Email author
  1. 1.Laboratory of Genetics, Department of Regulation Biology, Faculty of ScienceSaitama UniversitySaitamaJapan
  2. 2.Department of Molecular Microbiology, Research Institute for Microbial DiseasesOsaka UniversityOsakaJapan
  3. 3.Population and Quantitative Genomics TeamRIKEN Genomic Sciences CenterKanagawaJapan

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