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Prokaryotes

Draft Genome Sequences of Two Bulgarian Bacillus anthracis Strains

Dawn N. Birdsell, Markus Antwerpen, Paul Keim, Matthias Hanczaruk, Jeffrey T. Foster, Jason W. Sahl, David M. Wagner, Gregor Grass
Dawn N. Birdsell
Center for Microbial Genetics and Genomics, Northern Arizona University, Flagstaff, Arizona, USAa;
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Markus Antwerpen
Bundeswehr Institute of Microbiology, Munich, Germanyc
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Paul Keim
Center for Microbial Genetics and Genomics, Northern Arizona University, Flagstaff, Arizona, USAa;
Pathogen Genomics Division, Translational Genomics Research Institute, Flagstaff, Arizona, USAb;
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Matthias Hanczaruk
Bundeswehr Institute of Microbiology, Munich, Germanyc
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Jeffrey T. Foster
Center for Microbial Genetics and Genomics, Northern Arizona University, Flagstaff, Arizona, USAa;
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Jason W. Sahl
Pathogen Genomics Division, Translational Genomics Research Institute, Flagstaff, Arizona, USAb;
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David M. Wagner
Center for Microbial Genetics and Genomics, Northern Arizona University, Flagstaff, Arizona, USAa;
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Gregor Grass
Bundeswehr Institute of Microbiology, Munich, Germanyc
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DOI: 10.1128/genomeA.00152-13
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ABSTRACT

Bacillus anthracis strains previously isolated from Bulgaria form a unique subcluster within the A1.a cluster that is typical for isolates from southeastern Europe. Here, we report the draft genome sequences of two Bulgarian B. anthracis strains belonging to the A branch (A.Br.)008/009 canonical single nucleotide polymorphism (SNP) group of the major A branch.

GENOME ANNOUNCEMENT

Anthrax is a zoonotic disease that is endemic in many countries worldwide. The Gram-positive endospore-forming bacterium Bacillus anthracis produces several virulence factors required for establishing infections in animal and human hosts. Major virulence factors are encoded on two large plasmids, pX01 and pX02. Despite the importance of these plasmids for host infections, many strains of B. anthracis, especially those isolated from soil and/or after long-term culturing, lack one or both plasmids (1). Previously, we genetically analyzed 40 B. anthracis strains collected in Bulgaria, isolated mostly between 1960 and 1980, and found that over half of them lacked one or both plasmids (2). The three major phylogenetic lineages (branches A, B, and C) of B. anthracis are divided into 12 clonal groups by the analysis of 13 canonical single nucleotide polymorphisms (canSNPs) (3). We classified each strain as belonging to either the A branch (A.Br.)008/009 or A.Br.WNA genetic group (2) and placed all 40 strains onto the existing global phylogenetic tree (3, 4). As part of our continuing efforts aimed at determining the phylogeography of B. anthracis isolates in Europe, we sequenced the genomes of two Bulgarian B. anthracis strains representing the A.Br.008/009 genetic group. Whole genome sequences of these strains permit in-depth comparisons of Bulgarian B. anthracis A.Br.008/009 strains with other A.Br.008/009 strains from western and central Europe and areas south and east of the Black Sea (2).

Whole-genome shotgun (WGS) sequencing of the B. anthracis strains was performed using the Illumina GAIIx sequencing platform (Illumina, Inc.). For the WGS libraries, 4.6 to 5.79 million 100-bp reads were generated. Reads were assembled with AMOScmp (5), using the B. anthracis Ames ancestor strain (6) as the reference. Following assembly, contigs were processed with the PAGIT pipeline (7). A de novo assembly was also performed with Velvet (8), in conjunction with the VelvetOptimiser (http://bioinformatics.net.au/software.velvetoptimiser.shtml). The AMOS and Velvet assemblies were then aligned with Mugsy (9). Regions unique to the de novo assembly were then aligned back against the comparative assembly with BLASTn (10). Contigs that failed to align were concatenated with the comparative assembly into the final assembly. The assembled contigs were submitted to the RAST annotation server for subsystem classification and functional annotation (11).

The total lengths of the draft genome shotgun sequences of B. anthracis strains 3154 and 3166 were 5.0 and 5.5 Mbp, respectively, and their mean G+C content was 35.35% ± 0.1%. The chromosomal sequences of these strains contained 3 to 5 contigs with 189- to 235-fold average coverage. The plasmids pX01 and pX02 in strain 3166 were assembled on 2 contigs with 434-fold coverage. The B. anthracis 3154 genome contains a ~200-kb deletion compared to the Ames ancestor (accession no. YP_019942 to YP_020195), comprising genes for a beta-lactam antibiotic acylase (accession no. YP_019964) and a sulfamethoxypyridazine (SMPR) multidrug efflux pump (accession no. YP_019986).

Nucleotide sequence accession numbers.The draft genome sequences of B. anthracis strains 3154 and 3166 have been included in the GenBank WGS database under accession no. ANFF00000000 and ANFG00000000, respectively. The versions described in this paper are the first versions, accession no. ANFF01000000 and ANFG01000000, respectively.

ACKNOWLEDGMENTS

We thank the Bioforensics and Genomics Division of the Bundeswehr Institute of Microbiology for their technical support.

This work was supported in part by the U.S. Department of Homeland Security Science and Technology Directorate via awards HSHQDC-10-C-00139 and 2010-ST-108-000015.

FOOTNOTES

    • Received 1 March 2013.
    • Accepted 13 March 2013.
    • Published 18 April 2013.
  • Copyright © 2013 Birdsell et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 3.0 Unported license.

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Draft Genome Sequences of Two Bulgarian Bacillus anthracis Strains
Dawn N. Birdsell, Markus Antwerpen, Paul Keim, Matthias Hanczaruk, Jeffrey T. Foster, Jason W. Sahl, David M. Wagner, Gregor Grass
Genome Announcements Apr 2013, 1 (2) e00152-13; DOI: 10.1128/genomeA.00152-13

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Draft Genome Sequences of Two Bulgarian Bacillus anthracis Strains
Dawn N. Birdsell, Markus Antwerpen, Paul Keim, Matthias Hanczaruk, Jeffrey T. Foster, Jason W. Sahl, David M. Wagner, Gregor Grass
Genome Announcements Apr 2013, 1 (2) e00152-13; DOI: 10.1128/genomeA.00152-13
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