Journal
JOURNAL OF ANTIMICROBIAL CHEMOTHERAPY
Volume 66, Issue 10, Pages 2235-2239Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jac/dkr311
Keywords
ICEs; CTAB; tetracycline resistance; IS1216; Tn916; conjugative transposon
Funding
- Commission of the European Communities [241446]
- 5th Framework research and technological development (RTD) program [QLK2-CT-2002-00843]
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Objectives: Tn916-like elements are one of the most common types of integrative and conjugative element (ICE). In this study we aimed to determine whether novel accessory genes, i.e. genes whose products are not involved in mobility or regulation, were present on a Tn916-like element (Tn6087) isolated from Streptococcus oralis from the human oral cavity. Methods: A minocycline-resistant isolate was analysed using restriction fragment length polymorphism (RFLP) analysis on amplicons derived from Tn916 and DNA sequencing to determine whether there were genetic differences in Tn6087 compared with Tn916. Mutational analysis was used to determine whether the novel accessory gene found was responsible for an observed extra phenotype. Results: A novel Tn916-like element, Tn6087, is described that encodes both antibiotic and antiseptic resistance. The antiseptic resistance protein is encoded by a novel small multidrug resistance gene, designated qrg, that was shown to encode resistance to cetyltrimethylammonium bromide (CTAB), also known as cetrimide bromide. Conclusions: This is the first Tn916-like element described that confers both antibiotic and antiseptic resistance, suggesting that selection of either antibiotic or antiseptic resistance will also select for the other and further highlights the need for prudent use of both types of compound.
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