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Article Abstract
Trueperella pyogenes, an opportunistic pathogen causes various ailments in different animals. Different strains from different animals have distinct characters phenotypically and genotypically. Hence understanding the strains in a particular geographical location helps in framing the preventive measures. Comparative genomics of all the available T. pyogenes genome in the NCBI was conducted to understand the relatedness among strains. Whole genome phylogeny showed host associated clustering of strains recovered from swine lungs. Core genome phylogeny also showed host associated clustering mimicking whole genome phylogeny results. MLST analysis showed that there was higher diversity among cattle strains. Multidimensional scaling revealed five swine clusters, two cattle and buffalo clusters. Pangenome analysis also showed that T. pyogenes had an open genome with 57.09% accessory genome. Host specific genes were identified by pangenome analysis, and (R)-citramalate synthase was specific for swine strains of Asian origin. Host specifc genes identified by pangenome analysis can be exploited for developing a molecular assay to specifically identify the strains. The study shows that MLST having higher discriminatory power can be used as an epidemiological tool for strain discrimination of T. pyogenes.
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