Summary
A transformation procedure based on the complementation of a genetic defect was developed using a nitrate reductase-deficient mutant of Aspergillus flavus. The initial transformation efficiency was improved 40-fold by combining factors in a planned experimental program. Although low, this transformation rate was sufficient to obtain transformants in which the urate oxidase-encoding gene (uaZ) was disrupted in a gene replacement experiment. These new uaZ- strains were unable to utilize uric acid as the unique nitrogen source and could be reversed directly to the wild-type phenotype in second order transformation experiments using a urate oxidase-expressing vector.
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Chevalet, L., Tiraby, G., Cabane, B. et al. Transformation of Aspergillus flavus: construction of urate oxidase-deficient mutants by gene disruption. Curr Genet 21, 447–453 (1992). https://doi.org/10.1007/BF00351654
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DOI: https://doi.org/10.1007/BF00351654