Primer and probe sequences for LAMP-LFD detection of Vibrio vulnificus
A technology of LAMP-LFD and Vibrio vulnificus, which is applied in the direction of microorganism-based methods, biochemical equipment and methods, and microorganism measurement/inspection, can solve the problems of detection sensitivity and detection speed, and achieve short detection time and high detection efficiency. High sensitivity and improved detection speed
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Embodiment 1
[0039] Establishment of a method for detection of Vibrio vulnificus by LAMP-LFD technique
[0040] 1. Primer design: Design according to the coding sequence of the Vibrio vulnificus outer membrane protein gene TolC (GenBank accession number: DQ296643) published in NCBI, where the primer sequences are as follows:
[0041] TolC-F3: 5'-TCTTGAAGCCACTTATCGC-3',
[0042] TolC-B3: 5'-CAGCATCAACATCCAGTACA-3',
[0043] TolC-FIP: 5'-TACCAACATCAAAGCCCGCTTttttCGTGCGTATGAGCAATCT-3',
[0044] TolC-BIP: 5'-GATGCCACTCGTCGCCTTttttGCAGTACACTCAAGATGTAGTT-3',
[0045] TolC-LF: 5'-GGTTGCTTCTAATGCTGAACG-3',
[0046] TolC-LB: 5'-AACCTATCGAATGCACGCT-3', the 5' end of TolC-FIP is biotinylated;
[0047] Simultaneously, design a set of probes, can specifically bind to LAMP amplification product, be used for LFD detection, sequence is as follows:
[0048] TolC-HP: 5'-GGTACTCGTACTATTGTGGAT-3', the 5' end is labeled with fluorescein isothiocyanate.
[0049] 2. Sample DNA extraction: using water boili...
Embodiment 2
[0056] Specificity Determination of Vibrio vulnificus LAMP-LFD Detection Using Primers and Probes of the Invention
[0057] Using the designed specific primers and probes, Vibrio vulnificus ATCC 27562, Vibrio harveyi ATCC 33866, Vibrio riverina ATCC 33809, Vibrio parahaemolyticus ATCC 33847, Vibrio rotiferus DSM 17186T, Vibrio alginolyticus Genomic DNA of bacteria ATCC 17749, Vibrio anguillarum sweetfish isolate, Aeromonas hydrophila (Ah0201), Staphylococcus aureus ATCC 6538, and Listeria monocytogenes ATCC 19115 were used as templates, according to the steps in Example 1 above 3 and step 4 for LAMP-LFD reaction, verify the specificity of primers and probes, double distilled water as a negative control. The result is as figure 1 and figure 2 As shown, using the electrophoresis method ( figure 1 ) and LFD ( figure 2 ) can only amplify the target bands from the genomic DNA samples of Vibrio vulnificus, and other samples have no amplified bands, indicating that the use of...
Embodiment 3
[0059] Sensitivity determination of Vibrio vulnificus LAMP-LFD detection using primers and probes of the present invention
[0060] The genomic DNA of Vibrio vulnificus was extracted by the boiling method in step 2 of the above-mentioned embodiment 1, and used as the initial concentration of the template for the LAMP-LFD reaction (equivalent to 3.7×10 9 wxya -1 ), carry out 10-fold serial dilution, respectively as templates, carry out LAMP-LFD reaction according to step 3 and step 4 of the above-mentioned Example 1, and verify the sensitivity of primers and probes, and double distilled water is used as a negative control. The result is as image 3 , Figure 4 and Figure 5 As shown, the sensitivity of the LAMP-LFD detection using the primers and probes provided by the invention is 3.7×10 2 wxya -1 ( Figure 4 ), consistent with the sensitivity obtained by agarose gel electrophoresis detection of LAMP amplification products ( image 3 ), which is 100 times that of the co...
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