Tongchai Nimitphak. The development of loop-mediated isothermal amplification with lateral-flow dipsticks (LAMP-LFD) to detect infection of Hepatopancreatic parvovirus (HPV). Master's Degree(Biotechnology). Mahidol University. : Mahidol University, 2008.
The development of loop-mediated isothermal amplification with lateral-flow dipsticks (LAMP-LFD) to detect infection of Hepatopancreatic parvovirus (HPV)
Abstract:
Shrimp hepatopancreatic parvovirus (HPV) is a DNA virus that retards growth
in cultivated shrimp. Present methods for its detection include normal or nested PCR
followed by electophoresis, PCR-ELISA, real-time PCR, immunodetection and
histological examination. These techniques entail various disadvantages such as high
cost, long assay time or use of toxic substances. Loop-mediated isothermal
amplification (LAMP) is a novel method for rapid, sensitive and specific pathogen
detection via amplification of target nucleotide sequences under inexpensive
isothermal conditions. Combining LAMP with amplicon detection by
chromatographic lateral-flow dipsticks (LFD) instead of electrophoresis allows
interpretation of results within 10 min. A set of four LAMP primers was designed
from the capsid protein gene of HPV and LAMP conditions were optimized at 63oC
for 1 h. The FITC-labeled DNA probe for the LFD test was optimized at 20 pmole.
With a quantified plasmid template containing the LAMP target sequence, LAMPLFD
was 100 times more sensitive than PCR-electrophoresis and equal to nested PCRelectrophoresis.
With DNA extracts from HPV-infected shrimp, it was 10 times more
sensitive than normal PCR-electrophoresis but 10 times less sensitive than a
commercial kit for nested PCR-electroporesis. The LAMP-LFD method gave negative
test results with DNA extracts from normal shrimp and from shrimp infected with
other DNA viruses including monodon baculovirus (MBV), white spot syndrome virus
(WSSV) and infectious hypodermal and hematopoietic necrosis virus (IHHNV).