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We have cloned two different beta-tubulin sequences from the filamentous fungus Aspergillus nidulans. Each was used in the construction of transforming plasmids that carry the pyr4 gene of Neurospora crassa. We used these plasmids to transform a pyrG-strain of Aspergillus to uridine prototrophy. Both plasmids were shown to integrate site specifically into the homologous chromosomal sequences. We then used transformant strains in genetic crosses to demonstrate that one of the cloned beta-tubulin sequences was the benA beta-tubulin gene, which codes for the beta 1-and beta 2-tubulins. The other cloned beta-tubulin sequence was shown to be the structural gene for beta 3-tubulin by gene disruption and to participate in conidial development. This is the first report of a gene disruption by site specific, integrative recombination in Aspergillus nidulans.
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