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- A Putative APSES Transcription Factor Is Necessary for Normal Growth and Development of Aspergillus nidulans
- Ji-Yeon Lee , Lee-Han Kim , Ha-Eun Kim , Jae-Sin Park , Kap-Hoon Han , Dong-Min Han
- J. Microbiol. 2013;51(6):800-806. Published online December 19, 2013
- DOI: https://doi.org/10.1007/s12275-013-3100-2
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- 11 Citations
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Abstract
- The nsdD gene encoding a GATA type transcription factor positively controls sexual development in Aspergillus nidulans. According to microarray data, 20 genes that were upregulated by deleting nsdD during various life cycle stages were randomly selected and deleted for functional analysis. None of the mutants showed apparent changes in growth or development compared with those of the wild-type except the AN3154 gene that encodes a putative APSES transcription factor and is an ortholog of Saccharomyces cerevisiae swi4. Deleting AN3154 resulted in retarded growth and development, and the gene was named rgdA (retared growth and development). The rgdA deletion mutant developed a reduced number of conidia even under favorable conditions for asexual development. The retarded growth and development was partially suppressed by the veA1 mutation. The conidial heads of the mutant aborted, showing reduced and irregular shaped phialides. Fruiting body development was delayed compared with that in the wild-type. The mutant did not respond to various nutritional or environmental factors that affected the development patterns. The rgdA gene was expressed at low levels throughout the life cycle and was not significantly affected by several regulators of sexual and asexual development such as nsdD, veA, stuA, or brlA. However, the rgdA gene affected brlA and abaA expression, which function as key regulators of asexual sporulation, suggesting that rgdA functions upstream of those genes.
- NOTE] Simple Identification of veA1 Mutation in Aspergillus nidulans
- Kap-Hoon Han , Jae-Sin Park , Keon Sang Chae , Dong-Min Han
- J. Microbiol. 2010;48(6):885-887. Published online January 9, 2011
- DOI: https://doi.org/10.1007/s12275-010-0506-y
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- 9 Citations
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Abstract
- The veA gene plays an important role in development of a homothallic filamentous fungus Aspergillus nidulans. The veA1 phenotype can be difficult to distinguish from the wild-type veA. Despite the importance of the veA allele, no efficient identification method has been reported besides DNA sequencing. Here, we present simple physiological and molecular biological ways to distinguish between the veA wild-type and veA1 allele. The novel approaches, which involve incubation in the presence of oxalic acid, polymerase chain reaction using double mismatched primers, and BstXI enzyme digestion, are simpler, faster and more cost-efficient than genome sequencing.
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