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Virulence, infection, and pathogenicity related genes of fish pathogens

Research Project

Project/Area Number 10460085
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field General fisheries
Research InstitutionTokyo University of Fisheries

Principal Investigator

AOKI Takashi  Tokyo University of Fisheries, Faculty of Fisheries, Professor, 水産学部, 教授 (00051805)

Co-Investigator(Kenkyū-buntansha) HIRONO Ikuo  Tokyo University of Fisheries, Faculty of Fisheries, Assistant Professor, 水産学部, 助手 (00270926)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥12,100,000 (Direct Cost: ¥12,100,000)
Fiscal Year 1999: ¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 1998: ¥7,300,000 (Direct Cost: ¥7,300,000)
KeywordsVirulene gene / Fish pathogen / Pasteurella piscicida / Lactococcus garivieae / Edwardsiella tarda / Vibrio / genome analysis / Pasteurellapiscicida / LPS合成遺伝子群 / マクロファージ耐性遺伝子
Research Abstract

In this study, we analysed the virulence related genes of Pasteurella piscicida, Lactococcus garvieae, Edwardsiella tarda, Vibrio anguillarum and V. parahaemolyticus.
Genome analysis was conducted to detect the virulence genes in P. piscicida KP9038. We have sequenced the both ends of approximately 900 clones. As a result of comparisons of these clones to the GeneBank database, it was determined that there are 13 toxin related genes, and 6 capsule and LPS synthesis genes. Characteristics of some of these virulence related genes have not detected in vitro. These results suggest that P. piscicida may express several virulence related genes only in vivo.
Five different clones were isolated from the gene library of the L garvieae SA8201 (KG-) strain by immunological screening using rabbit serum against L. garvieae (KG-) phenotype cells. The amino acid sequences of the immunologically detected proteins were homologous to a processing protease, dihydropteroate synthase, trigger factor, N-acetylglucosamine-6-phosphate deacetylase, and anti-phagocytosis M protein. Five genes were specifically expressed in the virulence KG- phenotype strains.
The eth hemolysin gene locus of E. tarda encodes the hemolysin EthA protein and its accessory protein EthB. We constructed mutants by site-directed marker insertion mutagenesis in ethA or ethB. Both the ethAィイD1-ィエD1 and ethBィイD1-ィエD1 mutants lacked extracellular, cell-associated, and intracellular hemolytic activities. The pathogenicity of these single gene mutants became weaker than that of original stain.
Chitinase genes from V. anguillarum KV9001 and V. parahaemolyticus ATCC17802 were cloned. The deduced amino acid sequences of these genes have 71.6% identity. The vac gene was highly prevalent in V. anguillarum, and the DNA probe of the vac gene hybridized to V. alginolyticus and Beneckea proteolytica DNA. The DNA probe of the vpc gene hybridized to V. alginolyticus, V. harveyi, and V. ordalii DNA.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Hirono, I.: "Identification of genes in KG phenotype of Lactococcus garvieae, a fish pathogenic bacterium, whose proteins react with anti-KG rabbit serum"Microbial Pathogenesis. 27. 407-417 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hirono, I.: "An accessory protein of the iron-regulated hemolysin of Edwardsiella tarda is necessary for hemolytic activity"Fisheries Science. 64. 924-928 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hirono, I.: "Molecular cloning of chitinase genes from Vibrio anguillarum and V. parahaemolyticus"Journal of Applied Microbiology. 84. 1175-1179 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hirono, I., H. Yamashita, C-L. Park, T. Yoshida, and T. Aoki: "Identification of genes in KG-phenotype of Lactococcus garvieae, a fish pathogenic bacterium, whose proteins react with anti-KG-rabbit serum"Microbial Pathogenesis. 27. 407-417 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hirono, I., S-J. Lee, and T. Aoki: "An accessory protein of the iron-regulated hemolysin of Edwardsiella tarda is necessary for hemolytic activity"Fisheries Science. 64(69. 924-928 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hirono, I., M. Yamashita, and T. Aoki: "Molecular cloning of chitinase genes from Bibrio anguillarum and V. parahaemolyticus"Journal of Applied Microbiology. 84. 1175-1179 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hirono,I.: "Idetification of genes in KG phenotype of Lactococcus garvieae,a fish pathogenic bacterium, whose proteins react with anti-KG rabbit serum."Microbial Pathogenesis. 27. 407-417 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hirono,I.: "An accessory protein of the iron-regulated hemolysin of Edwardsiella tarda is necessary for hemolytic activity" Fish.Sci.64(6). 924-928 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Hirono,I.: "Molecular cloning of chitinase genes from Vibrio anguillarum and V.parahaemolyticus." Journal of Appllied Microbiology. 84. 1175-1179 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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