Improvement of Gene Targeting inAspergillus nidulanswith Excess Non-Homologous Fragments

Efficiency of gene targeting was increased more than 10-fold when an excess molar ratio of non-homologous fragments was added in the transformation of Aspergillus nidulans. In the targeted transformants, integration of such fragments into the host chromosome was a rare event. Hence, our approach proved practical in terms of producing successful targeting events without disturbing the host chromosomes.