A defect of LigD (human Lig4 homolog) for nonhomologous end joining significantly improves efficiency of gene-targeting in Aspergillus oryzae

Osamu Mizutani, Youhei Kudo, Akemi Saito, Tomomi Matsuura, Hirokazu Inoue, Keietsu Abe, Katsuya Gomi

Research output: Contribution to journalArticlepeer-review

88 Citations (Scopus)

Abstract

Gene-targeting by homologous recombination occurs rarely during transformation since nonhomologous recombination is predominant in Aspergillus oryzae. To develop a highly efficient gene-targeting system for A. oryzae, we constructed disrupted strains harboring a gene (ligD) encoding human DNA ligase IV homolog that is involved in the final step of DNA nonhomologous end joining. The A. oryzae ligD disruptants showed no apparent defect in vegetative growth and/or conidiation, and exhibited increased sensitivity to high concentration of methyl methansulfonate causing double-stranded DNA breaks compared with that of wild-type strain, but not to ethyl methanesulfonate and phleomycin. Gene replacement of the prtR, a gene encoding a transcription factor which regulates extracellular proteolytic genes, using the Aspergillus nidulans sC gene as the selectable marker resulted in 100% of gene-targeting efficiency in the ligD disruptant, compared to less than 30% for a wild-type, when the length of the homologous flanking sequences used was longer than 0.5 kb. Similarly, gene-targeting efficiency was as high as 100% for aspartic protease-encoding gene (pepA). Furthermore, using this ligD disruptant system of A. oryzae, we readily succeeded in disrupting five mitogen-activated protein kinase (MAPK) genes, namely mpkA, mpkB, hogA, mpkC and A. oryzae unique MAPK (mpkD). Such results show that the ligD disruptant system is an extremely convenient genetic background for gene-targeting in A. oryzae.

Original languageEnglish
Pages (from-to)878-889
Number of pages12
JournalFungal Genetics and Biology
Volume45
Issue number6
DOIs
Publication statusPublished - 2008 Jun

Keywords

  • Aspergillus oryzae
  • DNA ligase IV (ligD)
  • Gene-targeting
  • Homologous recombination
  • Mitogen-activated protein kinase (MAPK)

ASJC Scopus subject areas

  • Microbiology
  • Genetics

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