魚病研究
Online ISSN : 1881-7335
Print ISSN : 0388-788X
ISSN-L : 0388-788X
最新号
選択された号の論文の3件中1~3を表示しています
論文
  • Tomokazu Takano, Tomomasa Matsuyama, Yasuhiko Kawato, Takamitsu Sakai, ...
    原稿種別: Research Article
    2020 年 54 巻 4 号 p. 83-92
    発行日: 2020/01/15
    公開日: 2020/01/25
    ジャーナル 認証あり

    Red sea bream iridoviral disease (RSIVD) spreads readily throughout the marine environment because of its wide variety of host species. Use of a rapid diagnostic method, such as the immunofluorescence antibody test, helps to control the disease, so the anti-RSIV monoclonal antibody M10 (mAb M10) has been developed in Japan. In the present study, we carried out epitope mapping using the phage display method to identify the antigen of mAb M10. A phage display RSIV peptide library was constructed to cover the entire genome of RSIV, then phage clones recognized by the antibody were selected by biopanning. The selected clones harbored partial fragments of the laminin-type epidermal growth factor-like domain (LEGFD) gene. N-terminal and C-terminal deletion peptides were then prepared from the amino acid sequence deduced from the smallest fragment to precisely determine the epitope. Finally, seven amino acids, EYDCPEY, located in the extracellular domain of the LEGFD protein were determined to be the epitope. Identical residues of the epitope were also identified from the LEGFD protein in other megalocytiviruses including the infectious spleen and kidney necrosis virus and turbot reddish body iridovirus. mAb M10 is considered to be widely available for the diagnostics of megalocytivirus infections.

  • Sho Shirakashi, Tsukasa Waki, Kazuo Ogawa
    原稿種別: Research Article
    2020 年 54 巻 4 号 p. 93-100
    発行日: 2020/01/15
    公開日: 2020/01/25
    ジャーナル 認証あり

    Ayu Plecoglossus altivelis is a native amphidromous fish in Japan and an important target for farming and recreational fishing. ​We have found high infection of hitherto unknown digenean metacercariae in wild ayu larvae and juveniles captured from the sea and a river in Wakayama Prefecture. ​The infection prevalence was 95% and 100% in larvae and juvenile ayu, respectively with variable intensities up to 566 metacercariae per fish. ​The metacercariae were located primarily around fins and inside caudal fins, but appeared to cause no serious pathological features to the fish. ​The phylogenetic analysis based on the internal transcribed spacer 2 and 28S rDNA sequences revealed its identity as a member of Bucephalinae (Bucephalidae) with no identical genetic information on the database. ​Morphological characteristics of the larval trematode resembled those of the genus Prosorhynchoides. ​Genetically identical metacercariae were also found from Scomber japonicus and Engraulis japonicus captured at the same location as P. altivelis with variable infection levels, which suggested that it was a marine species. ​Experimental infection challenge of the metacercariae to several marine fish via oral intubation failed to obtain adult specimen and thus the precise identification of the parasite remains unknown.

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