Recombination-Mediated Host Adaptation by Avian Staphylococcus aureus

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Murray , S , Pascoe , B , Meric , G , Mageiros , L , Yahara , K , Hitchings , M D , Friedmann , Y , Wilkinson , T S , Gormley , F J , Mack , D , Bray , J E , Lamble , S , Bowden , R , Jolley , K A , Maiden , M C J , Wendlandt , S , Schwarz , S , Corander , J , Fitzgerald , J R & Sheppard , S K 2017 , ' Recombination-Mediated Host Adaptation by Avian Staphylococcus aureus ' , Genome Biology and Evolution , vol. 9 , no. 4 , pp. 830-842 .

Title: Recombination-Mediated Host Adaptation by Avian Staphylococcus aureus
Author: Murray, Susan; Pascoe, Ben; Meric, Guillaume; Mageiros, Leonardos; Yahara, Koji; Hitchings, Matthew D.; Friedmann, Yasmin; Wilkinson, Thomas S.; Gormley, Fraser J.; Mack, Dietrich; Bray, James E.; Lamble, Sarah; Bowden, Rory; Jolley, Keith A.; Maiden, Martin C. J.; Wendlandt, Sarah; Schwarz, Stefan; Corander, Jukka; Fitzgerald, J. Ross; Sheppard, Samuel K.
Contributor: University of Helsinki, Department of Mathematics and Statistics
Date: 2017-04
Language: eng
Number of pages: 13
Belongs to series: Genome Biology and Evolution
ISSN: 1759-6653
Abstract: Staphylococcus aureus are globally disseminated among farmed chickens causing skeletal muscle infections, dermatitis, and septicaemia. The emergence of poultry-associated lineages has involved zoonotic transmission from humans to chickens but questions remain about the specific adaptations that promote proliferation of chicken pathogens. We characterized genetic variation in a population of genome-sequenced S. aureus isolates of poultry and humanorigin. Genealogical analysis identified a dominant poultry-associated sequence cluster within the CC5 clonal complex. Poultry and human CC5 isolates were significantly distinct from each other and more recombination events were detected in the poultry isolates. We identified 44 recombination events in 33 genes along the branch extending to the poultry-specific CC5 cluster, and 47 genes were found more often in CC5 poultry isolates compared with those from humans. Many of these gene sequences were common in chicken isolates from other clonal complexes suggesting horizontal gene transfer among poultry associated lineages. Consistent with functional predictions for putative poultry-associated genes, poultry isolates showed enhanced growth at 42 degrees C and greater erythrocyte lysis on chicken blood agar in comparison with human isolates. By combining phenotype information with evolutionary analyses of staphylococcal genomes, we provide evidence of adaptation, following a human-to-poultry host transition. This has important implications for the emergence and dissemination of new pathogenic clones associated with modern agriculture.
Subject: Staphylococcus
poultry infection
1181 Ecology, evolutionary biology
1183 Plant biology, microbiology, virology
112 Statistics and probability

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