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Key genomic differences between bovine and human treponemes implicate microbial mechanisms that enhance knowledge of how DD, a severe disease of ruminants, has emerged into a prolific, worldwide disease. Bovine DD treponemes have additional oxidative stress genes compared to nearest human-isolated relatives, suggesting better oxidative stress tolerance, and potentially explaining how bovine strains can colonize skin surfaces. Comparison of both bovine DD and GI treponemes as well as bovine pathogenic and human non-pathogenic saprophyte <jats:italic>Treponema phagedenis<\/jats:italic> strains indicates genes encoding a five-enzyme biosynthetic pathway for production of 2,3-diacetamido-2,3-dideoxy-d-mannuronic acid, a rare di-<jats:italic>N<\/jats:italic>-acetylated mannuronic acid sugar, as important for pathogenesis. Bovine <jats:italic>T<\/jats:italic>. <jats:italic>phagedenis<\/jats:italic> strains further differed from human strains by having unique genetic clusters including components of a type IV secretion system and a phosphate utilisation system including <jats:italic>phoU<\/jats:italic>, a gene associated with osmotic stress survival. Proteomic analyses confirmed bovine derived <jats:italic>T<\/jats:italic>. <jats:italic>phagedenis<\/jats:italic> exhibits expression of PhoU but not the putative secretion system, whilst the novel mannuronic acid pathway was expressed in near entirety across the DD treponemes. Analysis of osmotic stress response in water identified a difference between bovine and human <jats:italic>T<\/jats:italic>. <jats:italic>phagedenis<\/jats:italic> with bovine strains exhibiting enhanced survival. This novel mechanism could enable a selective advantage, allowing environmental persistence and transmission of bovine <jats:italic>T<\/jats:italic>. <jats:italic>phagedenis<\/jats:italic>. Finally, we investigated putative outer membrane protein (OMP) ortholog families across the DD treponemes and identified several families as multi-specific adhesins capable of binding extra cellular matrix (ECM) components. One bovine pathogen specific adhesin ortholog family showed considerable serodiagnostic potential with the <jats:italic>Treponema medium<\/jats:italic> representative demonstrating considerable disease specificity (91.6%). This work has shed light on treponeme host adaptation and has identified candidate molecules for future diagnostics, vaccination and therapeutic intervention.<\/jats:p>","DOI":"10.1371\/journal.ppat.1009464","type":"journal-article","created":{"date-parts":[[2021,3,29]],"date-time":"2021-03-29T17:37:05Z","timestamp":1617039425000},"page":"e1009464","update-policy":"https:\/\/doi.org\/10.1371\/journal.ppat.corrections_policy","source":"Crossref","is-referenced-by-count":16,"title":["Dissecting the molecular diversity and commonality of bovine and human treponemes identifies key survival and adhesion mechanisms"],"prefix":"10.1371","volume":"17","author":[{"given":"Gareth J.","family":"Staton","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3100-2896","authenticated-orcid":true,"given":"Simon 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