| Literature DB >> 30810518 |
D R Bogema1,2, J McKinnon2, M Liu2, N Hitchick3, N Miller3, C Venturini4, J Iredell4, A E Darling2, P Roy Chowdury2, S P Djordjevic2.
Abstract
Sequence type (ST)73 has emerged as one of the most frequently isolated extraintestinal pathogenic Escherichia coli. To examine the localized diversity of ST73 clonal groups, including their mobile genetic element profile, we sequenced the genomes of 16 multiple-drug resistant ST73 isolates from patients with urinary tract infection from a single hospital in Sydney, Australia, between 2009 and 2011. Genome sequences were used to generate a SNP-based phylogenetic tree to determine the relationship of these isolates in a global context with ST73 sequences (n=210) from public databases. There was no evidence of a dominant outbreak strain of ST73 in patients from this hospital, rather we identified at least eight separate groups, several of which reoccurred, over a 2 year period. The inferred phylogeny of all ST73 strains (n=226) including the ST73 clone D i2 reference genome shows high bootstrap support and clusters into four major groups that correlate with serotype. The Sydney ST73 strains carry a wide variety of virulence-associated genes, but the presence of iss, pic and several iron-acquisition operons was notable.Entities:
Keywords: class 1 integron; uropathogenic Escherichia coli
Year: 2020 PMID: 30810518 PMCID: PMC7067039 DOI: 10.1099/mgen.0.000255
Source DB: PubMed Journal: Microb Genom ISSN: 2057-5858
Fig. 1.A SNP-derived phylogenetic tree of the Sydney ST73 strains sequenced in this study compared with antimicrobial-resistance and virulence profiles. Bootstrap values based on 100 replicate trees are shown at labelled nodes. Isolate serotypes as determined by in silico serotyping are shown by coloured tip labels. Antibiotic resistance and virulence gene/gene-family presence (blue) or absence (white) is shown by the linked bar graph/heatmap. Percentage identity of blast matches is indicated by heatmap shade, with darker shades representing higher identity. blast match coverage is represented by tile height with solid tiles representing 100 % coverage. For gene families (x-axis; bold), tile height represents total blast match coverage of all gene family members and shows completeness of the gene family. Where single genes are indicated (x-axis; plain text), bar height represents blast match coverage of the gene.
Fig. 2.SNP-based maximum-likelihood phylogram of 226 ST73 strains. A more detailed tree with branch support values and tip labels can be found in Fig. S2. ST73 isolates separate into four distinct groups, labelled A–D, which correlate well with in silico serotyping (inset). ST73 isolates sequenced in this study cluster into eight distinct groups, shown in red, high-quality complete ST73 genomes are shown in blue. Trees were reconstructed using 18 426 SNPs identified by read mapping to the clone D i2 reference sequence, reduced from 27 568 SNPs by filtering of recombination regions.
Phenotypic antimicrobial resistance
| Patient | AMP | AMC | LEX | CIP | GEN | NIT | NOR | TMP |
|---|---|---|---|---|---|---|---|---|
| 2009_3 | R | R | S | S | S | S | S | S |
| 2009_5 | R | R | S | S | S | S | S | S |
| 2009_6 | R | R | S | S | S | S | – | S |
| 2009_8 | R | S | S | S | S | S | – | S |
| 2009_13 | R | S | S | S | S | S | S | S |
| 2009_14/16 | R | S | S | S | S | S | – | S |
| 2009_21 | R | S | S | S | S | S | – | S |
| 2009_38 | R | S | S | S | S | S | S | S |
| 2009_44 | R | – | S | S | S | S | S | S |
| 2009_45 | R | S | S | S | S | S | S | S |
| 2010_64 | R | S | S | S | S | S | – | S |
| 2011_69 | R | S | S | S | S | R | S | S |
| 2011_82 | S | – | S | S | S | S | S | R |
| 2011_93/98 | R | S | S | S | S | S | – | S |
AMC, amoxicillin-clavulanic acid; AMP, ampicillin; CIP, ciprofloxacin; GEN, gentamicin; LEX, cephalexin; NIT, nitrofurantoin; NOR, norfloxacin; R, resistant; S, susceptible; TMP, trimethoprim.
Fig. 3.Schematic representations of integron structures found within this collection.
Fig. 4.Epidemic curve for ST73 isolates sequenced in this study. Isolates are coloured to match groups identified by comparison to isolates from the SRA. Core SNP distances between samples of the same group are shown with coloured horizontal lines.