Applied Microbiology and Biotechnology

, Volume 71, Issue 6, pp 881–891 | Cite as

Square-plate culture method allows detection of differential gene expression and screening of novel, region-specific genes in Aspergillus oryzae

  • Kumiko Masai
  • Jun-ichi Maruyama
  • Kazutoshi Sakamoto
  • Harushi Nakajima
  • Osamu Akita
  • Katsuhiko Kitamoto
Genomics and Proteomics

Abstract

When grown on solid agar medium, the mycelium of a filamentous fungus, Aspergillus oryzae, forms three morphologically distinct regions: the tip (T), white (W), and basal (B) regions. In this study, we developed the square-plate culture method, a novel culture method that enabled the extraction of mRNA samples from the three regions and analyzed the differential gene expression of the A. oryzae mycelium in concert with the microarray technique. Expression of genes involved in protein synthesis was predominant in the T region; relative expression was, at most, six times higher in the T region compared to the other regions. Genes encoding hypothetical proteins were expressed at high levels in the W and B regions. In addition, genes coding transporters/permeases were predominantly transcribed in the B region. By analyzing the expression patterns of genes in the three regions, we demonstrated the dynamic changes in the regulation of gene expression that occur along the mycelium of filamentous fungi. Consequently, our study established a method to analyze and screen for region-specific genes whose function may be essential for morphogenesis and differentiation in filamentous fungi and whose traits may be beneficial to the biotechnology industry.

Supplementary material

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Kumiko Masai
    • 1
  • Jun-ichi Maruyama
    • 1
  • Kazutoshi Sakamoto
    • 2
  • Harushi Nakajima
    • 1
    • 3
  • Osamu Akita
    • 2
  • Katsuhiko Kitamoto
    • 1
  1. 1.Graduate School of Agricultural and Life Sciences, Department of BiotechnologyUniversity of TokyoBunkyo-kuJapan
  2. 2.National Research Institute of BrewingHigashi-HiroshimaJapan
  3. 3.Department of Agricultural ChemistryMeiji UniversityKawasakiJapan

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