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Whole-genome comparison of two Acinetobacter baumannii isolates from a single patient, where resistance developed during tigecycline therapy

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Hornsey, M., Loman, Nicholas J., Wareham, D. W., Ellington, M. J., Pallen, Mark J., Turton, J. F., Underwood, A., Gaulton, T., Thomas, C. P., Doumith, M., Livermore, D. M. and Woodford, N. (2011) Whole-genome comparison of two Acinetobacter baumannii isolates from a single patient, where resistance developed during tigecycline therapy. Journal of Antimicrobial Chemotherapy, Volume 66 (Number 7). pp. 1499-1503. doi:10.1093/jac/dkr168

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Official URL: http://dx.doi.org/10.1093/jac/dkr168

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Abstract

Objectives The whole genomes of two Acinetobacter baumannii isolates recovered from a single patient were sequenced to gain insight into the nature and extent of genomic plasticity in this important nosocomial pathogen over the course of a short infection. The first, AB210, was recovered before tigecycline therapy and was susceptible to this agent; the second, AB211, was recovered after therapy and was resistant.

Methods DNA from AB210 was sequenced by 454 GS FLX pyrosequencing according to the standard protocol for whole-genome shotgun sequencing, producing ∼250 bp fragment reads. AB211 was shotgun sequenced using the Illumina Genetic Analyzer to produce fragment reads of exactly 36 bp. Single nucleotide polymorphisms (SNPs) and large deletions detected in AB211 in relation to AB210 were confirmed by PCR and DNA sequencing.

Results Automated gene prediction detected 3850 putative coding sequences (CDSs). Sequence analysis demonstrated the presence of plasmids pAB0057 and pACICU2 in both isolates. Eighteen putative SNPs were detected between the pre- and post-therapy isolates, AB210 and AB211. Three contigs in AB210 were not covered by reads in AB211, representing three deletions of ∼15, 44 and 17 kb.

Conclusions This study demonstrates that significant differences were detectable between two bacterial isolates recovered 1 week apart from the same patient, and reveals the potential of whole-genome sequencing as a tool for elucidating the processes responsible for changes in antibiotic susceptibility profiles.

Item Type: Journal Article
Divisions: Faculty of Medicine > Warwick Medical School > Biomedical Sciences > Microbiology & Infection
Faculty of Medicine > Warwick Medical School
Journal or Publication Title: Journal of Antimicrobial Chemotherapy
Publisher: Oxford University Press
ISSN: 0305-7453
Official Date: July 2011
Dates:
DateEvent
July 2011Published
Volume: Volume 66
Number: Number 7
Page Range: pp. 1499-1503
DOI: 10.1093/jac/dkr168
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
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