Positive selection inhibits gene mobilization and transfer in soil bacterial communities



Hall, JPJ ORCID: 0000-0002-4896-4592, Williams, D, Paterson, S ORCID: 0000-0002-1307-2981, Harrison, E and Brockhurst, MA
(2017) Positive selection inhibits gene mobilization and transfer in soil bacterial communities. Nature Ecology and Evolution, 1 (9). pp. 1348-1353.

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Abstract

Horizontal gene transfer (HGT) between bacterial lineages is a fundamental evolutionary process that accelerates adaptation. Sequence analyses show that conjugative plasmids are principal agents of HGT in natural communities. However, we lack understanding of how the ecology of bacterial communities and their environments affect the dynamics of plasmid-mediated gene mobilization and transfer. Here we show, in simple experimental soil bacterial communities containing a conjugative mercury resistance plasmid, the repeated, independent mobilization of transposon-borne genes from chromosome to plasmid, plasmid to chromosome and, in the absence of mercury selection, interspecific gene transfers from the chromosome of one species to the other via the plasmid. By reducing conjugation, positive selection for plasmid-encoded traits, like mercury resistance, can consequently inhibit HGT. Our results suggest that interspecific plasmid-mediated gene mobilization is most likely to occur in environments where plasmids are infectious, parasitic elements rather than those where plasmids are positively selected, beneficial elements.

Item Type: Article
Uncontrolled Keywords: Antimicrobial Resistance, Genetics, Infectious Diseases, 3 Good Health and Well Being
Depositing User: Symplectic Admin
Date Deposited: 01 Aug 2017 06:20
Last Modified: 16 Mar 2024 16:25
DOI: 10.1038/s41559-017-0250-3
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3008752