The Gene Has Recently Spread Between Rolling Circle Plasmids of , Indicative of a Novel Gene Transfer Mechanism

Overview

Journal Front Microbiol

Specialty Microbiology

Date 2016 Oct 13

PMID 27729906

Citations 8

Authors

Trudy M Wassenaar

David W Ussery

Hanne Ingmer

Affiliations

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Abstract

Resistance of species to quaternary ammonium compounds, frequently used as disinfectants and biocides, can be attributed to genes. Most gene products belong to the Small Multidrug Resistant (SMR) protein family, and are often encoded by rolling-circle (RC) replicating plasmids. Four classes of SMR-type gene families have been described in species: , and . Within their class, these genes are highly conserved, but genes are extremely conserved, although they are found in variable plasmid backgrounds. The lower degree of sequence identity of these plasmids compared to the strict nucleotide conservation of their means that this gene has recently spread. In the absence of insertion sequences or other genetic elements explaining the mobility, we sought for an explanation of mobilization by sequence comparison. Publically available sequences of genes, their flanking genes and the replication gene that is invariably present in RC-plasmids were compared to reconstruct the evolutionary history of these plasmids and to explain the recent spread of . Here we propose a new model that explains how is mobilized and transferred to acceptor RC-plasmids without assistance of other genes, by means of its location in between the Double Strand replication Origin (DSO) and the Single-Strand replication Origin (SSO). The proposed mobilization model of this DSO--SSO element represents a novel mechanism of gene mobilization in RC-plasmids, which has also been employed by other genes, such as (conferring lincomycin resistance). The proposed gene mobility has aided to the wide spread of clinically relevant resistance genes in populations.

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