Surveillance of Type 1 Ostreid Herpesvirus (OsHV-1) Variants in Japan

Yoshiko Shimahara; Jun Kurita; Ikunari Kiryu; Toyohiro Nishioka; Kei Yuasa; Morihiko Kawana; Takashi Kamaishi; Norihisa Oseko

doi:10.3147/jsfp.47.129

Research Articles

Surveillance of Type 1 Ostreid Herpesvirus (OsHV-1) Variants in Japan

Yoshiko Shimahara, Jun Kurita, Ikunari Kiryu, Toyohiro Nishioka, Kei Yuasa, Morihiko Kawana, Takashi Kamaishi, Norihisa Oseko

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Keywords: Ostreid herpesvirus, OsHV-1, OsHV-1 μVar, Crassostrea gigas, C. sikamea, C. ariakensis, Japan, Pacific oyster

JOURNAL FREE ACCESS

2012 Volume 47 Issue 4 Pages 129-136

DOI https://doi.org/10.3147/jsfp.47.129

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Abstract

Ostreid herpesvirus 1 (OsHV-1) μVar is a variant of OsHV-1 and suspected of being the causative agent of acute mass mortality events of Pacific oysters during summers in Europe since 2008. In this study, the distribution of OsHV-1 was surveyed in the six main oyster-producing areas of Japan, using PCR targeting a C2/C6 fragment including ORF4. PCR products were amplified from 123 out of 1,714 oysters of three species of Crassostrea (C. gigas, C. sikamea and C. ariakensis), and 23 different nucleotide sequences, showing 96% to 99% similarity to the reference OsHV-1, were obtained. Although 18 sequences among the 23 obtained possessed a microsatellite deletion unique to OsHV-1 μVar, all PCR products contained two conserved nucleotides that were shared with the reference OsHV-1 and not with OsHV-1 μVar. Here, we found variable types of OsHV-1 in oysters in Japan, but their nucleotide sequences were not identical to those of OsHV-1 μVar.

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