A defect of LigD (human Lig4 homolog) for nonhomologous end joining significantly improves efficiency of gene-targeting in Aspergillus oryzae.
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.
Mizutani
Osamu
O
Laboratory of Bioindustrial Genomics, Department of Bioindustrial Informatics and Genomics, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai 981-8555, Japan.
Kudo
Youhei
Y
Saito
Akemi
A
Matsuura
Tomomi
T
Inoue
Hirokazu
H
Abe
Keietsu
K
Gomi
Katsuya
K
D001236:Aspergillus oryzae / Q000201:enzymology* / Q000235:genetics*; D000072481:DNA Ligase ATP; D011088:DNA Ligases / Q000737:chemistry / Q000235:genetics*; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics; D018390:Gene Targeting; D005800:Genes, Fungal; D005822:Genetic Vectors / Q000235:genetics; D006801:Humans; D020929:Mitogen-Activated Protein Kinase Kinases / Q000235:genetics; D008969:Molecular Sequence Data; D010641:Phenotype; D011995:Recombination, Genetic; D017386:Sequence Homology, Amino Acid
D005656:Fungal Proteins; C000607893:LIG4 protein, human; D020929:Mitogen-Activated Protein Kinase Kinases; D011088:DNA Ligases; D000072481:DNA Ligase ATP