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Detection of a Novel, and Likely Ancestral, Tn916-Like Element from a Human Saliva Metagenomic Library

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Reynolds, Liam J., Anjum, Muna F. and Roberts, Adam ORCID: https://orcid.org/0000-0002-0760-3088 (2020) 'Detection of a Novel, and Likely Ancestral, Tn916-Like Element from a Human Saliva Metagenomic Library'. Genes, Vol 11, Issue 5, e548.

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Abstract

Tn916 is a conjugative transposon (CTn) and the first reported and most well characterised of the Tn916/Tn1545 family of CTns. Tn916-like elements have a characteristic modular structure and different members of this family have been identified based on similarities and variations in these modules. In addition to carrying genes encoding proteins required for their conjugation, Tn916-like elements also carry accessory, antimicrobial resistance genes; most commonly the tetracycline resistance gene, tet(M). Our study aimed to identify and characterise tetracycline resistance genes from the human saliva metagenome using a functional metagenomic approach. We identified a tetracycline-resistant clone, TT31, the sequencing of which revealed it to encode both tet(M) and tet(L). Comparison of the TT31 sequence with the accessory, regulation, and recombination modules of other Tn916-like elements indicated that a partial Tn916-like element encoding a truncated orf9 was cloned in TT31. Analysis indicated that a previous insertion within the truncated orf9 created the full length orf9 found in most Tn916-like transposons; demonstrating that orf9 is, in fact, the result of a gene fusion event. Thus, we hypothesise that the Tn916-like element cloned in TT31 likely represents an ancestral Tn916.

Item Type: Article
Subjects: QU Biochemistry > Genetics > QU 460 Genomics. Proteomics
QU Biochemistry > Genetics > QU 470 Genetic structures
QW Microbiology and Immunology > QW 45 Microbial drug resistance. General or not elsewhere classified.
Faculty: Department: Biological Sciences > Department of Tropical Disease Biology
Digital Object Identifer (DOI): https://doi.org/10.3390/genes11050548
Depositing User: Lynn Roberts-Maloney
Date Deposited: 14 May 2020 10:27
Last Modified: 14 May 2020 10:27
URI: https://archive.lstmed.ac.uk/id/eprint/14461

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