Draft genomes of Klebsiella pneumoniae and Streptococcus anginosus strains found in the urine of the same female patient

TL;DR

This paper presents the draft genomes of two bacterial strains found in a patient's urine, which may help understand recurrent infections.

Contribution

The novelty lies in providing draft genome sequences of co-isolated bacteria from a specific clinical context.

Findings

Klebsiella pneumoniae 5008-1 and Streptococcus anginosus 5008-2 were isolated from the same urine sample.

The draft genomes may aid in understanding the role of these bacteria in recurrent infections.

Abstract

Here, we report the draft genomes of Klebsiella pneumoniae 5008-1 and Streptococcus anginosus 5008-2 strains isolated from a catheterized urine sample obtained from an asymptomatic postmenopausal woman diagnosed with recurrent urinary tract infection and receiving vaginal estrogen cream.

Tables

TABLE 1. Genome assembly characteristics for two commensal urinary bacteria

Isolate	K. pneumoniae S5 5008-1	S. anginosus S6 5008-2
Draft genome assembly features
No. of reads	31M	22.4M
No. of contigs	64	62
Contig N50	331, 358	121, 792
Coverage	216×	412×
Completeness (BUSCO)	99.9%	99.5%
Genome size	5,417,390 bp	2,001,769 bp
No. of total genes	5,352	2,074
GC content	56.8%	39.9%
Predicted markers of interest
Plasmids	IncFIB(K), IncFII(K)	repUS43
CRISPR/Cas locus		1
Resistance	Tetracyclines, β-lactams, amphenicols
Virulence genes	6ccl, clpk1, fimH, mrkA, lutA, traT
Bacteriocins	Two colicins, bottromycin	Zoocin A

Full text

ANNOUNCEMENT

Since the early studies of microorganisms inhabiting the healthy urinary bladder of humans, there is an ongoing process in the identification of urinary commensal organisms and their interactions among themselves, with the host cells, and incoming pathogenic species (1). In this announcement, we describe the analysis of two bacterial strains*—K. pneumoniae* 5008-1 and S. anginosus 5008-2—isolated from an asymptomatic postmenopausal woman (58 years old) diagnosed with recurrent urinary tract infection. At the time of isolation, the patient was using vaginal estrogen cream, without prophylactic antibiotics. With patient consent and approval of the Duke University Medical Center Institutional Review Board (IRB, # Pro00083917), urine was obtained by aseptic catheterization and plated on sheep blood agar (2–5). Two types of colonies were observed and identified by matrix-assisted laser desorption ionization–time of flight (MALDI-TOF) mass spectrometry (6) as K. pneumoniae 5008-1 and S. anginosus 5008-2.

The isolates were propagated successfully in De-Man-Rogosa-Sharpe broth and stored as glycerol freezer stocks. Later, the strains were grown in tryptic soy media for obtaining biomass, and total DNA was extracted using the Qiagen DNEasy Blood and Tissue kit. Sequencing libraries were prepared with the Illumina DNA Prep kit. These libraries were sequenced on an Illumina NextSeq platform in 150 bp paired-end mode (Table 1). The raw paired-end reads were trimmed for adapter sequences and low-quality reads using the TrimGalore Toolkit (v.0.4.4) (7), which utilizes Cutadapt (v.1.16) (8). The quality of the raw reads was assessed using FastQC (v.0.11.7) (9). Three different assemblies were performed with the trimmed reads: (2) SPAdes (v.3.12.0) in default mode with the “careful” option enabled (1), SPAdes with the “careful” option enabled and a range of k-mers (35, 47, 59, 71, 83, 95, 107, 119, 127), and (3) Unicycler (v.0.4.4) in default mode (10). The final Unicycler assemblies were chosen based on their quality and completeness, as assessed by QUAST (v.4.5) (11) and BUSCO (v.3.0.2) (12) to identify conserved single-copy orthologs. To ensure no contamination, each assembly was run through the command line blastn (BLAST+, v.2.7.1) in megablast mode against the nt database (13). Default parameters were used here and throughout the analysis except where otherwise noted. The automated Prokaryotic Genome Annotation Pipeline v.3.1 was used to annotate obtained draft genomes before submitting to the databases, omitting contigs shorter than 200 bp (14).

The analysis of the draft genomes of K. pneumoniae and S. anginosus for markers of interest was done using PlasmidFinder 2.1 (15, 16), Phast (17), Virulence Finder 2.0 (18, 19,20), ResFinder 4.0 (21, 22), CRISPRCasFinder (23), and Bagel4 (24). The results are presented in Table 1.