Development and validation of a quantitative real-time polymerase chain assay for universal detection of the White Spot Syndrome Virus in marine crustaceans

Virology Journal

Arturo Sánchez-Paz¹  Fernando Mendoza-Cano¹ 

[1]Laboratorio de Referencia, Análisis y Diagnóstico en Sanidad Acuícola. Centro de Investigaciones Biológicas del Noroeste S. C. (CIBNOR), Calle Hermosa 101. Col. Los Ángeles., Hermosillo. Son C.P. 83106, México

关键词: Universal primers;    Diagnosis;    Specificity;    VP28;    Quantitative PCR;    WSSV;   

Others  :  1149706
DOI  :  10.1186/1743-422X-10-186

 received in 2013-02-28, accepted in 2013-05-28,  发布年份 2013

【 摘 要 】

Background

The White Spot Syndrome Virus (WSSV), the sole member of the family Whispoviridae, is the etiological agent that causes severe mortality events in wild and farmed shrimp globally. Given its adverse effects, the WSSV has been included in the list of notifiable diseases of the Office of International Epizootic (OIE) since 1997. To date there are no known therapeutic treatments available against this lethal virus, and a surveillance program in brood-stock and larvae, based on appropriate diagnostic tests, has been strongly recommended. However, some currently used procedures intended for diagnosis of WSSV may be particularly susceptible to generate spurious results harmfully impacting the shrimp farming industry.

Methods

In this study, a sensitive one-step SYBR green-based real-time PCR (qPCR) for the detection and quantitation of WSSV was developed. The method was tested against several WSSV infected crustacean species and on samples that were previously diagnosed as being positive for WSSV from different geographical locations.

Results

A universal primer set for targeting the WSSV VP28 gene was designed. This method demonstrated its specificity and sensitivity for detection of WSSV, with detection limits of 12 copies per sample, comparable with the results obtained by other protocols. Furthermore, the primers designed in the present study were shown to exclusively amplify the targeted WSSV VP28 fragment, and successfully detected the virus in different samples regardless of their geographical origin. In addition, the presence of WSSV in several species of crustaceans, including both naturally and experimentally infected, were successfully detected by this method.

Conclusion

The designed qPCR assay here is highly specific and displayed high sensitivity. Furthermore, this assay is universal as it allows the detection of WSSV from different geographic locations and in several crustacean species that may serve as potential vectors. Clearly, in many low-income import-dependent nations, where the growth of shrimp farming industries has been impressive, there is a demand for cost-effective diagnostic tools. This study may become an alternative molecular tool for a less expensive, rapid and efficient detection of WSSV.

【 授权许可】

   
2013 Mendoza-Cano and Sánchez-Paz; licensee BioMed Central Ltd.

【 图 表 】

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