Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 429407
Title Low numbers of repeat units in variable number of tandem repeats (VNTR) regions of white spot syndrome virus are correlated with disease outbreaks
Author(s) Tran Thi Tuyet, H.; Zwart, M.P.; Phuong, N.T.; Jong, M.C.M. de; Vlak, J.M.
Source Journal of Fish Diseases 35 (2012)11. - ISSN 0140-7775 - p. 817 - 826.
DOI http://dx.doi.org/10.1111/j.1365-2761.2012.01406.x
Department(s) Quantitative Veterinary Epidemiology
Laboratory of Virology
PE&RC
WIAS
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) repetitive dna-sequences - complete genome sequence - ribonucleotide reductase - penaeus-monodon - in-vivo - shrimp - virulence - wssv - identification - pathogenicity
Abstract White spot syndrome virus (WSSV) is the most important pathogen in shrimp farming systems worldwide including the Mekong Delta, Vietnam. The genome of WSSV is characterized by the presence of two major 'indel regions' found at ORF14/15 and ORF23/24 (WSSV-Thailand) and three regions with variable number tandem repeats (VNTR) located in ORF75, ORF94 and ORF125. In the current study, we investigated whether or not the number of repeat units in the VNTRs correlates with virus outbreak status and/or shrimp farming practice. We analysed 662 WSSV samples from individual WSSV-infected Penaeus monodon shrimp from 104 ponds collected from two important shrimp farming regions of the Mekong Delta: Ca Mau and Bac Lieu. Using this large data set and statistical analysis, we found that for ORF94 and ORF125, the mean number of repeat units (RUs) in VNTRs was significantly lower in disease outbreak ponds than in non-outbreak ponds. Although a higher mean RU number was observed in the improved-extensive system than in the rice-shrimp or semi-intensive systems, these differences were not significant. VNTR sequences are thus not only useful markers for studying WSSV genotypes and populations, but specific VNTR variants also correlate with disease outbreaks in shrimp farming systems.
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