Evaluation of a Multilocus Variable-Number Tandem-Repeat Analysis Scheme for Typing Ochrobactrum anthropi

Area of Science:

• Microbiology
• Genetics
• Infectious Diseases

Background:

• Ochrobactrum anthropi is a bacterium found in various environments.
• While generally of low virulence, it increasingly causes infections in immunocompromised individuals.
• Current identification relies on biochemical methods, and strain typing uses techniques like PFGE and sequencing.

Purpose of the Study:

• To evaluate the polymorphisms of variable-number tandem-repeats (VNTRs) in Ochrobactrum anthropi.
• To develop and validate a Multi-Locus Variable-number tandem repeat Analysis (MLVA) assay for O. anthropi typing.

Main Methods:

• Genomic DNA from 65 O. anthropi strains was analyzed.
• Tandem repeats were identified using Tandem Repeat Finder software.
• Twelve VNTR loci were selected, and primers were designed for PCR amplification.
• Multi-Locus Variable-number tandem repeat Analysis (MLVA-12) was performed.

Main Results:

• A total of 51 distinct genotypes were identified among the 65 O. anthropi strains.
• Strains from similar geographical or clinical origins clustered into the same or closely related genotypes.
• The MLVA-12 assay demonstrated significant discriminatory power.

Conclusions:

• The MLVA-12 assay is a powerful tool for O. anthropi typing and epidemiological studies.
• This method aids in inferring the origin of O. anthropi isolates.
• MLVA-12 offers improved species determination and strain differentiation compared to existing methods.