Development of a SYBR Green I real-time PCR for quantitative detection of Vibrio alginolyticus in seawater and seafood.
OBJECTIVE
Vibrio alginolyticus is an economically important micro-organism. The main aim of the present study was to develop a real-time polymerase chain reaction (PCR) assay for rapid, sensitive and effective quantification of V. alginolyticus in seawater and seafood.


RESULTS
Purified DNA of V. alginolyticus, artificially inoculated seawater and seafood tissue homogenates were subjected to the gyrB-targeted real-time PCR assay. Natural seawater and seafood samples were analysed by this real-time PCR protocol. Specificity tests showed that positive result was obtained only with V. alginolyticus strains. The detection sensitivity was determined to be 0.4 pg of genomic DNA equivalent to 72 cells per PCR in pure culture and 100 cells in 1 ml of seawater or seafood tissue homogenates. Single cell detection is achieved after 3 h of sample enrichment.


CONCLUSIONS
A sensitive and specific SYBR Green I-based real-time PCR assay targeting gyrB gene was successfully developed to quantify V. alginolyticus within 6 h in seawater and seafood samples.


CONCLUSIONS
No report on the molecular-based method was available for quantitative detection of V. alginolyticus. This work will provide a novel method for evaluation of the risk of V. alginolyticus to marine environmental health and seafood safety.
Zhou
S
S
State Key Laboratory of Biocontrol, College of Life Science, Sun Yat-sen University, Guangzhou, People's Rebublic of China.
Hou
Z
Z
Li
N
N
Qin
Q
Q
D000818:Animals; D052160:Benzothiazoles; D017931:DNA Primers; D004269:DNA, Bacterial / Q000032:analysis; D003959:Diamines; D005399:Fishes / Q000382:microbiology; D005516:Food Microbiology; D006801:Humans; D009930:Organic Chemicals; D010125:Ostreidae / Q000382:microbiology; D011804:Quinolines; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D017747:Seafood / Q000382:microbiology*; D012623:Seawater / Q000382:microbiology*; D012680:Sensitivity and Specificity; D044149:Vibrio alginolyticus / Q000235:genetics*; D014871:Water Microbiology
D052160:Benzothiazoles; D017931:DNA Primers; D004269:DNA, Bacterial; D003959:Diamines; D009930:Organic Chemicals; D011804:Quinolines; C098022:SYBR Green I