Author:
Diallinas G,Scazzocchio C
Abstract
Abstract
In Aspergillus nidulans, integration of transforming sequences can proceed through recombination with homologous sequences or at heterologous sites in the genome. In a strain with a large deletion in the gene coding for acetamidase (amdS), a plasmid carrying this gene integrates into and inactivates uapA, the putative structural gene for uric acid-xanthine permease, with a frequency of 0.3%. The integration event occurs 3' to the open reading frame of amdS. A 10-nucleotide sequence which occurs in this region is also found within the open reading frame of uapA. We have taken advantage of this integration event to clone the permease gene and to characterize a cis-acting mutation, uap-100, as a duplication of 139 bp located in the upstream region of uapA. Northern and dot blot analyses confirmed earlier results measuring the uptake of uric acid: the transcription of the uapA gene is inducible and the uap-100 mutation results in a bypass of the need for induction while having an 8-fold up-promoter effect under inducing conditions.
Publisher
Oxford University Press (OUP)
Cited by
69 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献