Evaluation of the genetic profiles of Brucella melitensis strain from Turkey using multilocus variable number tandem repeat analysis (MLVA) and multilocus sequence typing (MLST) techniques
2022
Akar, Kadir | Erganis, Osman
Brucellosis is caused by Brucella, and Brucella melitensis is highly prevalent in small ruminants in Turkey. Our aim was to genotype 50 B. melitensis strains isolated from sheep, goat, and cattle abortion samples from different farms in seven geographical regions of Turkey between 2009 and 2017. Forty-six different genotypes were detected in 50 isolates studied according to the MLVA-16. Thirty out of 50 isolate profiles matched profiles from the database exactly, and the remaining 20 were absent. Of these 30 isolates, 93.3% were identical to human isolates previously present in the database. All B. melitensis strains belonged to the eastern Mediterranean group. Genotype 43 was the most common isolate profile, and sequence typing (ST8) was dominant and detected in 39 strains. MLST analysis revealed a novel profile in 11 strains. On comparing the sequences of ST8 and the novel ST, a glucokinase gene variation was detected. In the MLST and MLVA analyses, no distinction was made between B. melitensis biovars. Moreover, there was no significant difference between the strains based on host, region, and year. Consequently, the discrimination power of MLVA was higher than that of MLST in this study. Contrastingly, MLST was useful in distinguishing strains according to geographic origins, as determined by performer studies. Profiles determined by MLVA were the same as those in humans. This raises concerns in regard to One Health and transition between hosts, as it is clear that protecting animal health is very important for human health.
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