Prevalence and heterogeneity of antibiotic-resistant genes in Orientia tsutsugamushi and other rickettsial genomes
Rao, R. S. P.; Ghate, S. D.; Shastry, R. P.; Kurthkoti, K.; Suravajhala, P.; Patil, P.; Shetty, P.
Show abstract
Despite a million infections every year and an estimated one billion people at risk, scrub typhus is regarded as a neglected tropical disease. The causative bacterium Orientia tsutsugamushi, a member of rickettsiae, seems to be intrinsically resistant to several classes of antibiotics. The emergence of antibiotic-resistant scrub typhus is likely to become a global public health concern. Yet, it is unknown as to how common antibiotic-resistant genes are in O. tsutsugamushi, and how variable these loci are among the genomes of rickettsiae. By using the comprehensive antibiotic resistance database, we explored 79 complete genomes from 24 species of rickettsiae for putative antibiotic-resistant loci. There were 244 unique antibiotic-resistant genes in rickettsiae. Both the total and unique antibiotic-resistant genes in O. tsutsugamushi were significantly less compared to other members of rickettsiae. However, antibiotic-resistant genes in O. tsutsugamushi genomes were more unique and highly variable. Many genes such as resistant versions of evgS, and vanS A/G were present in numerous copies. These results will have important implications in the context of antibiotic-resistant scrub typhus.
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