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Journal of Clinical Microbiology, August 2001, p. 2835-2845, Vol. 39, No. 8
Super Shrimp, Inc., National City,
California, California 91950
Received 14 December 2000/Returned for modification 10 May
2001/Accepted 26 May 2001
A rapid and highly sensitive real-time PCR detection and
quantification method for infectious hypodermal and hematopoietic necrosis virus (IHHNV), a single-stranded DNA virus, and white spot
virus (WSV), a double-stranded DNA (dsDNA) virus infecting penaeid
shrimp (Penaeus sp.), was developed using the GeneAmp 5700 sequence detection system coupled with SYBR Green chemistry. The PCR
mixture contains a fluorescence dye, SYBR Green, which upon binding to
dsDNA exhibits fluorescence enhancement. The enhancement of
fluorescence was proportional to the initial concentration of the
template DNA. A linear relationship was observed between the amount of
input plasmid DNA and cycle threshold (CT)
values over a range of 1 to 105 copies of the viral genome.
To control the variation in sampling and processing among samples, the
shrimp
0095-1137/01/$04.00+0 DOI: 10.1128/JCM.39.8.2835-2845.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Detection and Quantification of Infectious
Hypodermal and Hematopoietic Necrosis Virus and White Spot Virus in
Shrimp Using Real-Time Quantitative PCR and SYBR Green
Chemistry
-actin gene was amplified in parallel with the viral DNA. The
CT values of IHHNV- and WSV-infected samples
were used to determine absolute viral copy numbers from the standard
CT curves of these viruses. For each virus and
its
-actin control, the specificity of amplification was monitored by using the dissociation curve of the amplified product. Using genomic
DNA as a template, SYBR Green PCR was found to be 100- to 2000-fold
more sensitive than conventional PCR, depending on the virus, for the
samples tested. The results demonstrate that SYBR Green PCR can be used
as a rapid and highly sensitive detection and quantification method for
shrimp viruses and that it is amenable to high-throughout assay.
*
Corresponding author. Mailing address: Super Shrimp,
Inc., 1545 Tidelands Ave., Suite J, National City, CA 91950. Phone:
(619) 477-5394. Fax: (619) 477-5396. E-mail:
klimpel{at}supershrimp.com.
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