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Multi-locus variable number tandem repeat analysis of 7th pandemic Vibrio cholerae
Connie Lam1, Sophie Octavia, Peter R Reeves
1School of Biotechnology and Biomolecular Sciences, University of New South Wales, New South Wales, Australia.
Multilocus variable number of tandem repeats (VNTR) analysis (MLVA) highly discriminates Vibrio cholerae isolates from the 7th pandemic. Combining MLVA with Single Nucleotide Polymorphism (SNP) typing improves understanding of cholera
Area of Science:
- Microbiology
- Genetics
- Epidemiology
Background:
- Cholera, caused by Vibrio cholerae, remains a significant global public health concern with seven recorded pandemics.
- The current pandemic impacts multiple continents, highlighting the need for effective tracking and typing methods.
Purpose of the Study:
- To evaluate the discriminatory power of Multilocus Variable Number of Tandem Repeats (VNTR) analysis (MLVA) for Vibrio cholerae isolates.
- To assess the utility of MLVA in resolving genetic relationships within the 7th pandemic clone of V. cholerae.
Main Methods:
- Utilized multilocus variable number of tandem repeats (VNTR) analysis (MLVA) with six VNTR loci.
- Analyzed 66 V. cholerae isolates collected between 1961 and 1999.
- Compared MLVA data with Single Nucleotide Polymorphism (SNP) typing results.
Main Results:
- MLVA distinguished 66 isolates into 60 unique profiles with a high discriminatory power (0.995).
- Phylogenetic analysis revealed conflicts between MLVA and SNP typing for distantly related isolates.
- Closely related isolates showed consensus VNTR patterns within SNP groups.
Conclusions:
- MLVA is a highly discriminatory method for typing 7th pandemic V. cholerae.
- MLVA data is most effective when combined with SNP typing for detailed evolutionary and epidemiological analysis.
- Integrated MLVA and SNP typing provide a robust approach for long-term cholera surveillance.
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