Abstract
Mycobacterium avium subsp. paratuberculosis is the etiologic agent of Johne’s disease in ruminants and has also been associated with human Crohn’s disease. We report the complete genome sequence of M. avium subsp. paratuberculosis, isolated from the breast milk of a Crohn’s disease patient. This sequence has high identity with characterized strains recovered from cattle.
GENOME ANNOUNCEMENT
Mycobacterium avium subsp. paratuberculosis causes Johne’s disease (JD) in cattle, sheep, goats, and other ruminant animals. JD presents as a chronic granulomatous intestinal infection with a worldwide distribution and imposes a significant economic toll on livestock industries (1). M. avium subsp. paratuberculosis has a complex cell wall structure containing mycolic acids and several lipids similar to those of other members of this genus, yet it is the most slowly growing member. This bacterium often requires 8 to 16 weeks before colonies are visible in culture, which is a major hurdle in diagnostics and therefore in the implementation of optimal JD control measures. Although a well-established domestic and wild animal pathogen, it has also been implicated as a causative agent in human Crohn’s disease (2), and even though this link is controversial (3), M. avium subsp. paratuberculosis isolates have been obtained from humans. For instance, M. avium subsp. paratuberculosis 4, the isolate whose sequence we report here, was originally isolated from the breast milk of a Crohn’s disease patient in 2000 (4).
M. avium subsp. paratuberculosis is a member of the M. avium complex (5), yet only the subspecies paratuberculosis of this complex has been found to cause Johne’s disease. Another distinguishing phenotype of M. avium subsp. paratuberculosis is its requirement for the siderophore mycobactin in laboratory medium for growth. The genomes of cattle, sheep, and human strains of this pathogen have been sequenced (6–9). However, the human strain sequences are only in draft form. The data suggest that all nonsheep isolates of M. avium subsp. paratuberculosis are highly conserved and thus cluster as a homogeneous group (10), and isolates from humans are thought to cluster with the bovine strains; however, a complete sequence of an isolate from humans has not been available, and this has precluded comprehensive and definitive analyses.
Purified genomic DNA obtained from strain M. avium subsp. paratuberculosis 4 was subjected to whole-genome shotgun sequencing using 454 Life Sciences GS20 pyrosequencing technology (Roche, Indianapolis, IN). The 88.5 million bp were assembled into ~400 contigs using Newbler assembly software (Roche). These contigs were assembled into ~50 scaffolds using the M. avium subsp. paratuberculosis strain K-10 sequence as a reference. Sanger-based sequencing was used to close all gaps in an iterative manner, and areas with low-quality scores were resequenced in order to obtain a single assembled high-quality genome sequence that totals 4.83 Mb. The gaps in each scaffold were first closed by using the Lasergene SeqMan software 9.0 (DNAstar, Madison, WI). The gaps between scaffolds were closed by PCR amplification of the entire insertion sequence (IS) elements or repetitive sequences and flanking region on each end of the scaffolds. An annotation file (Artemis) was generated by Rapid Annotations using Subsystems Technology (http://rast.nmpdr.org/rast.cgi), and each coding sequence (CDS) was manually verified (11).
Nucleotide sequence accession number.
The whole-genome sequence of M. avium subsp. paratuberculosis 4 has been deposited at DDBJ/EMBL/GenBank under the accession no. CP005928.1.
ACKNOWLEDGMENTS
This research was supported in part by a competitive research grant from the U.S. Department of Agriculture (no. 2008-55620-18710) and the Johne’s Disease Integrated Program (JDIP).
We thank Zhengjin Tu and Wayne Xu at the University of Minnesota for their help on the primary assembly and analysis of M. avium subsp. paratuberculosis 4.
Footnotes
Citation Bannantine JP, Li L, Mwangi M, Cote R, Raygoza Garay JA, Kapur V. 2014. Complete genome sequence of Mycobacterium avium subsp. paratuberculosis, isolated from human breast milk. Genome Announc. 2(1):e01252-13. doi:10.1128/genomeA.01252-13.
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