Authors: Yasunobu Terabayashi Motoyuki Shimizu Tatsuya Kitazume Shunsuke Masuo Tatsuya Fujii Naoki Takaya
Publish Date: 2011/12/15
Volume: 93, Issue: 1, Pages: 305-317
Abstract
Hypoxia imposes stress on filamentous fungi that require oxygen to proliferate Global transcription analysis of Aspergillus oryzae grown under hypoxic conditions found that the expression of about 50 of 4244 affected genes was either induced or repressed more than 2fold A comparison of these genes with the hypoxically regulated genes of Aspergillus nidulans based on their predicted amino acid sequences classified them as bidirectional best hit BBH oneway best hit extra homolog EH and nohit nonsyntenic genes NSG genes Clustering analysis of the BBH genes indicated that A oryzae and A nidulans downregulated global translation and transcription under hypoxic conditions respectively Under hypoxic conditions both fungi upregulated genes for alcohol fermentation and the γaminobutyrate shunt of the tricarboxylate cycle whereas A oryzae upregulated the glyoxylate pathway indicating that both fungi eliminate NADH accumulation under hypoxic conditions The A oryzae NS genes included specific genes for secondary and nitric oxide metabolism under hypoxic conditions This comparative transcriptomic analysis discovered common and strainspecific responses to hypoxia in hypoxic Aspergillus speciesWe thank Drs Junichi Maruyama and Katsuhiko Kitamoto for providing the A oryzae GeneChip We thank Norma Foster for critical reading of the manuscript This study was partially supported by the Biooriented Technology Research Advancement Institution and a GrantinAid for Scientific Research from Japan Society for the Promotion of Science Japan
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