Recovery of a Medieval Brucella melitensis Genome Using Shotgun Metagenomics
Identifieur interne : 000400 ( Pmc/Corpus ); précédent : 000399; suivant : 000401Recovery of a Medieval Brucella melitensis Genome Using Shotgun Metagenomics
Auteurs : Gemma L. Kay ; Martin J. Sergeant ; Valentina Giuffra ; Pasquale Bandiera ; Marco Milanese ; Barbara Bramanti ; Raffaella Bianucci ; Mark J. PallenSource :
- mBio [ 2150-7511 ] ; 2014.
Abstract
Shotgun metagenomics provides a powerful assumption-free approach to the recovery of pathogen genomes from contemporary and historical material. We sequenced the metagenome of a calcified nodule from the skeleton of a 14th-century middle-aged male excavated from the medieval Sardinian settlement of Geridu. We obtained 6.5-fold coverage of a
Url:
DOI: 10.1128/mBio.01337-14
PubMed: 25028426
PubMed Central: 4161259
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PMC:4161259Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Recovery of a Medieval <italic>Brucella melitensis</italic>
Genome Using Shotgun Metagenomics</title>
<author><name sortKey="Kay, Gemma L" sort="Kay, Gemma L" uniqKey="Kay G" first="Gemma L." last="Kay">Gemma L. Kay</name>
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<author><name sortKey="Milanese, Marco" sort="Milanese, Marco" uniqKey="Milanese M" first="Marco" last="Milanese">Marco Milanese</name>
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<author><name sortKey="Bianucci, Raffaella" sort="Bianucci, Raffaella" uniqKey="Bianucci R" first="Raffaella" last="Bianucci">Raffaella Bianucci</name>
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<author><name sortKey="Pallen, Mark J" sort="Pallen, Mark J" uniqKey="Pallen M" first="Mark J." last="Pallen">Mark J. Pallen</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Recovery of a Medieval <italic>Brucella melitensis</italic>
Genome Using Shotgun Metagenomics</title>
<author><name sortKey="Kay, Gemma L" sort="Kay, Gemma L" uniqKey="Kay G" first="Gemma L." last="Kay">Gemma L. Kay</name>
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<author><name sortKey="Sergeant, Martin J" sort="Sergeant, Martin J" uniqKey="Sergeant M" first="Martin J." last="Sergeant">Martin J. Sergeant</name>
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<author><name sortKey="Giuffra, Valentina" sort="Giuffra, Valentina" uniqKey="Giuffra V" first="Valentina" last="Giuffra">Valentina Giuffra</name>
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<author><name sortKey="Bandiera, Pasquale" sort="Bandiera, Pasquale" uniqKey="Bandiera P" first="Pasquale" last="Bandiera">Pasquale Bandiera</name>
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<author><name sortKey="Milanese, Marco" sort="Milanese, Marco" uniqKey="Milanese M" first="Marco" last="Milanese">Marco Milanese</name>
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<author><name sortKey="Bramanti, Barbara" sort="Bramanti, Barbara" uniqKey="Bramanti B" first="Barbara" last="Bramanti">Barbara Bramanti</name>
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<author><name sortKey="Bianucci, Raffaella" sort="Bianucci, Raffaella" uniqKey="Bianucci R" first="Raffaella" last="Bianucci">Raffaella Bianucci</name>
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<author><name sortKey="Pallen, Mark J" sort="Pallen, Mark J" uniqKey="Pallen M" first="Mark J." last="Pallen">Mark J. Pallen</name>
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<series><title level="j">mBio</title>
<idno type="eISSN">2150-7511</idno>
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<front><div type="abstract" xml:lang="en"><title>ABSTRACT</title>
<p>Shotgun metagenomics provides a powerful assumption-free approach to the recovery of pathogen genomes from contemporary and historical material. We sequenced the metagenome of a calcified nodule from the skeleton of a 14th-century middle-aged male excavated from the medieval Sardinian settlement of Geridu. We obtained 6.5-fold coverage of a <italic>Brucella melitensis</italic>
genome. Sequence reads from this genome showed signatures typical of ancient or aged DNA. Despite the relatively low coverage, we were able to use information from single-nucleotide polymorphisms to place the medieval pathogen genome within a clade of <italic>B. melitensis</italic>
strains that included the well-studied Ether strain and two other recent Italian isolates. We confirmed this placement using information from deletions and IS<italic>711</italic>
insertions. We conclude that metagenomics stands ready to document past and present infections, shedding light on the emergence, evolution, and spread of microbial pathogens.</p>
</div>
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</TEI>
<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">mBio</journal-id>
<journal-id journal-id-type="iso-abbrev">MBio</journal-id>
<journal-id journal-id-type="hwp">mbio</journal-id>
<journal-id journal-id-type="pmc">mbio</journal-id>
<journal-id journal-id-type="publisher-id">mBio</journal-id>
<journal-title-group><journal-title>mBio</journal-title>
</journal-title-group>
<issn pub-type="epub">2150-7511</issn>
<publisher><publisher-name>American Society of Microbiology</publisher-name>
<publisher-loc>1752 N St., N.W., Washington, DC</publisher-loc>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">25028426</article-id>
<article-id pub-id-type="pmc">4161259</article-id>
<article-id pub-id-type="publisher-id">mBio01337-14</article-id>
<article-id pub-id-type="doi">10.1128/mBio.01337-14</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>Recovery of a Medieval <italic>Brucella melitensis</italic>
Genome Using Shotgun Metagenomics</article-title>
<alt-title>Medieval <italic>Brucella melitensis</italic>
Genome</alt-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Kay</surname>
<given-names>Gemma L.</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>a</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Sergeant</surname>
<given-names>Martin J.</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>a</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Giuffra</surname>
<given-names>Valentina</given-names>
</name>
<xref ref-type="aff" rid="aff2 aff3"><sup>b,c</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Bandiera</surname>
<given-names>Pasquale</given-names>
</name>
<xref ref-type="aff" rid="aff3"><sup>c</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Milanese</surname>
<given-names>Marco</given-names>
</name>
<xref ref-type="aff" rid="aff4"><sup>d</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Bramanti</surname>
<given-names>Barbara</given-names>
</name>
<xref ref-type="aff" rid="aff5"><sup>e</sup>
</xref>
</contrib>
<contrib contrib-type="author" corresp="yes"><name><surname>Bianucci</surname>
<given-names>Raffaella</given-names>
</name>
<xref ref-type="aff" rid="aff5 aff6 aff7"><sup>e,f,g</sup>
</xref>
</contrib>
<contrib contrib-type="author" corresp="yes"><name><surname>Pallen</surname>
<given-names>Mark J.</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>a</sup>
</xref>
</contrib>
<aff id="aff1"><label><sup>a</sup>
</label>
Division of Microbiology and Infection, Warwick Medical School, University of Warwick, Coventry, United Kingdom</aff>
<aff id="aff2"><label><sup>b</sup>
</label>
Division of Paleopathology, Department of Translational Research on New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy</aff>
<aff id="aff3"><label><sup>c</sup>
</label>
Department of Biomedical Sciences, Human Anatomy, University of Sassari, Sassari, Italy</aff>
<aff id="aff4"><label><sup>d</sup>
</label>
Department of History, University of Sassari, Sassari, Italy</aff>
<aff id="aff5"><label><sup>e</sup>
</label>
Department of Biosciences, Centre for Ecological and Evolutionary Synthesis, University of Oslo, Oslo, Norway</aff>
<aff id="aff6"><label><sup>f</sup>
</label>
Department of Public Health and Pediatric Sciences, Laboratory of Physical Anthropology, University of Turin, Turin, Italy.</aff>
<aff id="aff7"><label><sup>g</sup>
</label>
Anthropologie Bioculturelle, Droit, Ethique et Santé, Aix Marseille Université, Marseille, France</aff>
</contrib-group>
<author-notes><corresp id="cor1">Address correspondence to Raffaella Bianucci, <email>raffaella.bianucci@unito.it</email>
, or Mark J. Pallen, <email>m.pallen@warwick.ac.uk</email>
.</corresp>
<fn fn-type="equal"><p>G.L.K. and M.J.S. and R.B. and M.J.P. contributed equally to this work.</p>
</fn>
<fn fn-type="edited-by"><p><bold>Editor</bold>
Paul Keim, Northern Arizona University</p>
</fn>
</author-notes>
<pub-date pub-type="epub"><day>15</day>
<month>7</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="collection"><season>Jul-Aug</season>
<year>2014</year>
</pub-date>
<volume>5</volume>
<issue>4</issue>
<elocation-id>e01337-14</elocation-id>
<history><date date-type="received"><day>15</day>
<month>5</month>
<year>2014</year>
</date>
<date date-type="accepted"><day>11</day>
<month>6</month>
<year>2014</year>
</date>
</history>
<permissions><copyright-statement>Copyright © 2014 Kay et al.</copyright-statement>
<copyright-year>2014</copyright-year>
<copyright-holder>Kay et al.</copyright-holder>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc-sa/3.0/"><license-p>This is an open-access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc-sa/3.0/">Creative Commons Attribution-Noncommercial-ShareAlike 3.0 Unported license</ext-link>
, which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p>
</license>
</permissions>
<abstract><title>ABSTRACT</title>
<p>Shotgun metagenomics provides a powerful assumption-free approach to the recovery of pathogen genomes from contemporary and historical material. We sequenced the metagenome of a calcified nodule from the skeleton of a 14th-century middle-aged male excavated from the medieval Sardinian settlement of Geridu. We obtained 6.5-fold coverage of a <italic>Brucella melitensis</italic>
genome. Sequence reads from this genome showed signatures typical of ancient or aged DNA. Despite the relatively low coverage, we were able to use information from single-nucleotide polymorphisms to place the medieval pathogen genome within a clade of <italic>B. melitensis</italic>
strains that included the well-studied Ether strain and two other recent Italian isolates. We confirmed this placement using information from deletions and IS<italic>711</italic>
insertions. We conclude that metagenomics stands ready to document past and present infections, shedding light on the emergence, evolution, and spread of microbial pathogens.</p>
</abstract>
<abstract abstract-type="executive-summary"><title>IMPORTANCE</title>
<p>Infectious diseases have shaped human populations and societies throughout history. The recovery of pathogen DNA sequences from human remains provides an opportunity to identify and characterize the causes of individual and epidemic infections. By sequencing DNA extracted from medieval human remains through shotgun metagenomics, without target-specific capture or amplification, we have obtained a draft genome sequence of an ~700-year-old <italic>Brucella melitensis</italic>
strain. Using a variety of bioinformatic approaches, we have shown that this historical strain is most closely related to recent strains isolated from Italy, confirming the continuity of this zoonotic infection, and even a specific lineage, in the Mediterranean region over the centuries.</p>
</abstract>
<counts><page-count count="6"></page-count>
</counts>
<custom-meta-group><custom-meta><meta-name>cover-date</meta-name>
<meta-value>July/August 2014</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
<body><sec sec-type="intro" id="h0.0"><title>INTRODUCTION</title>
<p>Brucellosis is a widespread infection of livestock (sheep, goats, cattle, cows, and pigs) and remains one of the most common zoonotic infections, with more than 500,000 new human cases worldwide annually (<xref rid="B1" ref-type="bibr">1</xref>
). Human brucellosis is most commonly caused by the species <italic>Brucella melitensis</italic>
and is usually acquired through ingestion of unpasteurized dairy products or, less commonly, through ingestion of infected meat or direct occupational contact with animals (<xref rid="B1" ref-type="bibr">1</xref>
). If left untreated, the infection usually follows a chronic course, spreading systemically to the organs of the reticuloendothelial system and often leading to osteoarticular disease (<xref rid="B2" ref-type="bibr">2</xref>
).</p>
<p>Brucellosis is an ancient disease. Vertebral lesions consistent with brucellosis have been described in a >2-million-year-old male skeleton of <italic>Australopithecus africanus</italic>
(<xref rid="B3" ref-type="bibr">3</xref>
). Lesions consistent with brucellosis have been described in Bronze Age skeletons from the Levant and the Basque country, in adult skeletons from Herculaneum, and in medieval human remains (<xref rid="B2" ref-type="bibr">2</xref>
).</p>
<p>A major ambition of paleopathology is to shed light on the influence of infectious disease on past populations. However, morphological analyses are limited in that few infections produce durable lesions and very different pathogens can produce similar pathologies (<xref rid="B4" ref-type="bibr">4</xref>
). For example, similar lesions occur in tuberculosis and brucellosis, even though the causative organisms are quite different taxonomically and in cell structure. Amplification of pathogen DNA from human remains via PCR has provided an alternative source of information about a range of past infections (<xref rid="B5" ref-type="bibr">5</xref>
). However, only a single study has reported success in using PCR amplification to confirm historical brucellosis (<xref rid="B6" ref-type="bibr">6</xref>
).</p>
<p>In addition, there are problems with amplification-based approaches to the recovery of historical and ancient DNA. First, PCR is a competitive and highly sensitive reaction, prone to contamination even in dedicated facilities (<xref rid="B7" ref-type="bibr">7</xref>
). Second, these approaches generally provide information on a single gene or gene fragment, affording little or no insight into pathogen biology, evolution, and epidemiology. Third, they require the onerous design and optimization of pathogen-specific primers; this limits the open-endedness of the approach, so that one generally finds only what one is looking for. This last point also applies to genome capture approaches, which have proven successful in recovering <italic>Yersinia pestis</italic>
genomes from samples from the Black Death and the Justinianic plague (<xref rid="B8" ref-type="bibr">8</xref>
, <xref rid="B9" ref-type="bibr">9</xref>
).</p>
<p>Shotgun metagenomics—that is the unbiased sequencing <italic>en masse</italic>
of DNA extracted from a sample without target-specific amplification or capture—provides an attractive alternative approach to the detection and characterization of pathogens in contemporary and historical human material. This approach has proven successful in obtaining genome-wide sequence data for <italic>Borrelia burgdorferi</italic>
, <italic>Mycobacterium tuberculosis,</italic>
and <italic>Mycobacterium leprae</italic>
from long-dead human remains (<xref rid="B10" ref-type="bibr">10</xref>
<xref ref-type="bibr" rid="B11">–</xref>
<xref rid="B12" ref-type="bibr">12</xref>
).</p>
<p>When confronted with calcified nodules from a 14th-century skeleton, we initially thought of tuberculosis. However, when we used shotgun metagenomics to identify potential pathogens in the sample, we were instead surprised to recover a medieval <italic>Brucella melitensis</italic>
genome sequence.</p>
</sec>
<sec sec-type="results" id="h1"><title>RESULTS</title>
<sec id="h1.1"><title>Metagenomic recovery of <italic>Brucella melitensis</italic>
sequences with signatures of medieval origin.</title>
<p>The skeleton of a 50- to 60-year-old male (skeleton 2568) was excavated from the abandoned medieval village of Geridu (Sorso, Sassari, Italy) in northwest Sardinia in December 1997 (<xref ref-type="fig" rid="fig1">Fig. 1</xref>
) (<xref rid="B13" ref-type="bibr">13</xref>
). The skeleton showed features of diffuse idiopathic skeletal hyperostosis (DISH), including fusions between the fourth and tenth thoracic vertebrae, fusion of the fifth lumbar vertebra to the sacrum, and extraspinal enthesopathies (<xref rid="B14" ref-type="bibr">14</xref>
). Thirty-two calcified nodules were found in the pelvic girdle, with diameters ranging from 0.6 by 0.7 cm to 2.2 by 1.6 cm (<xref ref-type="fig" rid="fig1">Fig. 1</xref>
). A DNA extraction was performed on one of the nodules.</p>
<fig id="fig1" position="float"><label>FIG 1 </label>
<caption><p>(A) Calcific nodules excavated from the pelvic girdle of skeleton 2658. (B) Size distribution of reads from sample 2568. (i) All reads from the initial MiSeq run (~2 m). (ii) Reads from the second Miseq run (>20 m) which aligned with the <italic>B. melitensis</italic>
16 M genome. (iii) Reads from the dedicated run which mapped to the human genome (hg19). (C) Coverage plot of reads from sample 2568 mapped against the two chromosomes from the <italic>B. melitensis</italic>
16 M genome. The plot shows the average coverage and standard deviation for each 5,000-bp region in the genome. (D) Evidence of sequence damage associated with aged DNA showing the frequency of C-to-T and G-to-A transitions at the 5′ and 3′ ends of DNA fragments, respectively.</p>
</caption>
<graphic xlink:href="mbo0031418960001"></graphic>
</fig>
<p>We obtained a DNA yield from the nodule of 30 ng, which was used to construct a TruSeq Nano Illumina library, which was run at low coverage on an Illumina MiSeq sequencer, alongside 10 other bar-coded libraries, 8 from other historical human tissue samples and 2 from blank controls. Just over two million sequences were obtained from sample 2568 on this run. An analysis of size distribution was performed, revealing a bimodal distribution with a broad peak running from 50 to 150 bp, with a second much taller peak running up to the maximum read length of 250 bp (<xref ref-type="fig" rid="fig1">Fig. 1</xref>
). On the assumption that historical DNA fragments were restricted to the smaller peak, sequences over 150 bp in length were excluded from analysis of this run. Homology searches revealed sequences from sample 2568 that could be assigned with confidence to the genus <italic>Brucella.</italic>
</p>
<p>We then attempted to map reads from all 11 samples against the genome of the <italic>B. melitensis</italic>
reference strain 16 M. We obtained insignificant matches for 10 of the samples (<12 aligned reads per sample), whereas sample 2568 yielded >20,000 paired-end reads (equivalent to 10,000 sequences, as the fragments are shorter than the read length used in paired-end sequences) that mapped against the <italic>B. melitensis</italic>
16 M genome, providing approximately 0.7-fold coverage of a medieval <italic>Brucella</italic>
genome from a strain that we have called Geridu-1. A coverage plot (<xref ref-type="fig" rid="fig1">Fig. 1</xref>
) revealed even coverage across both chromosomes in the 16 M genome, ruling out spurious hits to conserved sequences from environmental bacteria.</p>
<p>To obtain additional sequencing reads, the sample 2568 library was sequenced at ~10-fold-higher coverage on a single dedicated MiSeq run, which yielded just over 20 million paired-end sequences. When these were mapped at high stringency, 23% of these reads mapped against the human genome and 0.48% against the <italic>B. melitensis</italic>
16 M genome (representing 6.5-fold coverage). Interestingly, when the reads that mapped to either the <italic>B. melitensis</italic>
or human genomes were reanalyzed, they showed a much tighter size distribution than the library as a whole, with a peak centered on 100 bases (<xref ref-type="fig" rid="fig1">Fig. 1</xref>
). In addition, the reads mapping to the <italic>B. melitensis</italic>
or human genome showed abundant CT and GA base conversions at the 5′ and 3′ ends, which is indicative of the damage typical of ancient or aged DNA (<xref ref-type="fig" rid="fig1">Fig. 1</xref>
). These findings are supportive of a medieval origin of these sequences (<xref rid="B15" ref-type="bibr">15</xref>
).</p>
</sec>
<sec id="h1.2"><title>SNP-based phylogenetic placement shows that the medieval <italic>Brucella</italic>
genome is closely related to recent Italian isolates.</title>
<p>Conventional phylogenetic methods based on identification of trusted single-nucleotide polymorphisms (SNPs) cannot be applied to low-coverage genome sequences. However, the technique of “phylogenetic placement” provides an alternative solution (<xref rid="B16" ref-type="bibr">16</xref>
). Here, one draws on a fixed reference tree, computed from high-coverage genomes, and places the unknown query sequence on the tree using programs such as pplacer. We used a published set of phylogenetically informative SNPs for <italic>Brucella</italic>
spp. (<xref rid="B17" ref-type="bibr">17</xref>
) and analyzed reads from the initial MiSeq run that aligned to equivalent positions in the 16 M genome. Using this approach, despite the low coverage, we could show confidently (with a posterior probability of 1) that the Geridu-1 strain clustered most closely with the well-characterized Ether strain (ATCC 23458; the reference strain for <italic>B. melitensis</italic>
biovar 3) and was nested within a clade of four <italic>B. melitensis</italic>
strains (see <xref ref-type="supplementary-material" rid="figS1">Fig. S1</xref>
in the supplemental material). Indeed, with as few as 250 reads, we were able to accurately assign the Geridu-1 strain to the Ether clade (<xref ref-type="supplementary-material" rid="figS2">Fig. S2</xref>
).</p>
<p>To refine the placement of the Geridu-1 genome, we constructed a broad-based phylogenetic tree from all available modern <italic>B. melitensis</italic>
genomes. This showed that Geridu-1’s close relative, the Ether strain, belonged in a distinctive clade along with four other strains, for which only draft genome sequences were available (see <xref ref-type="supplementary-material" rid="figS3">Fig. S3</xref>
in the supplemental material). We then compared all five strains from the Ether clade and the Geridu-1 genome recovered from the second MiSeq run by calling SNPs against the completed 16 M genome (<xref ref-type="supplementary-material" rid="tabS1">Table S1</xref>
) and using them to draw a phylogenetic tree for this clade (<xref ref-type="fig" rid="fig2">Fig. 2</xref>
). The SNP table and tree showed that the Geridu-1 strain represented the earliest branching lineage within the Ether clade, separated by 450 to 500 SNPs from any other strain in the clade (<xref ref-type="supplementary-material" rid="tabS2">Table S2</xref>
).</p>
<fig id="fig2" position="float"><label>FIG 2 </label>
<caption><p>Phylogenetic tree showing the position of the medieval Geridu-1 strain within the Ether clade. Only those SNPs which correlated with sufficient coverage in the Geridu-1 alignment were included in the construction of the tree.</p>
</caption>
<graphic xlink:href="mbo0031418960002"></graphic>
</fig>
<p>At least three of the five contemporary strains that belong to the Ether clade originate from the Italian peninsula or from Sicily: F15/06-7 is a 2006 human isolate from Sicily, F5/07-239A is a 2007 small-ruminant isolate from Italy, and the Ether strain itself was isolated from an Italian goat in 1961. There are no other Italian isolates in the set of currently available <italic>B. melitensis</italic>
genome sequences, perhaps suggesting that the Ether clade originated in Italy and its associated islands, or at least in the western Mediterranean. We note that in a recent multiple-locus variable-number tandem-repeat analysis (MLVA) study (<xref rid="B18" ref-type="bibr">18</xref>
), Italian strains clustered separately from most other European strains and we suspect that Geridu-1 belongs to the western Mediterranean cluster defined by MLVA, although additional genome sequencing of isolates from that cluster are required to confirm this.</p>
</sec>
<sec id="h1.3"><title>Confirmation of phylogenetic placement using insertions and deletions.</title>
<p>To confirm the placement of the Geridu-1 strain within the Ether clade of <italic>B. melitensis</italic>
, we drew upon two additional sources of information: the distribution of deletions and the locations of insertion elements. First, we looked for deletions of >100 bases in length that occurred in the Geridu-1 genome in comparison to the 16 M strain. We identified 11 such deletions (see <xref ref-type="supplementary-material" rid="tabS3">Table S3</xref>
in the supplemental material). We determined the distribution of these deletions in all available <italic>B. melitensis</italic>
genomes. Nine deletions were found in only Geridu-1 and the five other strains in the Ether clade. Two occurred sporadically in other strains.</p>
<p>Next, we examined the distribution and location of the insertion element IS<italic>711</italic>
(also called IS<italic>6501</italic>
), which occurs widely in <italic>Brucella</italic>
spp. (<xref rid="B19" ref-type="bibr">19</xref>
). When we mapped reads from the Geridu-1 genome to the insertion element, we obtained 52.3-fold coverage. Dividing that by the average coverage for the Geridu-1 genome (6.5-fold) provided us with an estimate of eight IS<italic>711</italic>
copies in the medieval strain. By analyzing reads that spanned the ends of IS<italic>711</italic>
and the adjacent chromosome, we were able to confirm the existence of eight insertion points in Geridu-1, seven of which also occurred in <italic>B. melitensis</italic>
16 M and in all other available <italic>B. melitensis</italic>
genomes (<xref ref-type="supplementary-material" rid="tabS3">Table S3</xref>
). The IS<italic>711</italic>
insertion present in Geridu-1 but absent from 16 M was located at position 517784 in chromosome 2, disrupting a gene encoding the hypothetical protein BMEII0494. This insertion point was found in no other <italic>B. melitensis</italic>
strain genome, apart from the other five members of the Ether lineage. These patterns of deletion and IS<italic>711</italic>
insertions confirm the placement of the Geridu-1 strain within the Ether clade of <italic>B. melitensis</italic>
.</p>
</sec>
</sec>
<sec sec-type="discussion" id="h2"><title>DISCUSSION</title>
<p>Here, we have shown that shotgun metagenomics can be used to obtain a <italic>Brucella melitensis</italic>
genome sequence from a medieval sample without target-specific amplification or capture. The recently reported success of this approach with two mycobacterial diseases, leprosy and tuberculosis, has been ascribed to the unique properties of the mycobacterial cell wall in preserving bacterial DNA (<xref rid="B11" ref-type="bibr">11</xref>
, <xref rid="B12" ref-type="bibr">12</xref>
). In contrast, this study confirms that whole-genome sequences from bacterial pathogens without resilient cell envelopes can be recovered from human remains by metagenomics hundreds or even thousands of years postmortem. However, unlike medieval mycobacterial DNA (<xref rid="B12" ref-type="bibr">12</xref>
), medieval <italic>Brucella</italic>
DNA does show signatures of damage associated with an ancient or historical provenance.</p>
<p>This observation complements several other lines of evidence that support the authenticity of data obtained from this historical sample. First, the sample was processed in facilities dedicated to ancient DNA research, where no work on <italic>Brucella</italic>
cultures or DNA had ever taken place. Second, laboratory contamination was ruled out by the lack of significant hits for <italic>Brucella</italic>
in libraries obtained from eight other historical specimens and two blanks sequenced in the same run. Third, we observed conclusive and extensive matches to a dedicated human and animal pathogen, obtaining even genomic coverage of a genome nested within the <italic>B. melitensis</italic>
phylogeny. This rules out spurious and patchy hits for conserved genes from related environmental organisms as a source of error. Finally, we took care to sample the interior of the nodule, which eliminated the risk of contamination from soil.</p>
<p>Calcification of soft tissue is a recognized, albeit rare, complication of human brucellosis, so we assume that calcification of abdominal or pelvic tissues accounts for the appearance of pelvic nodules in this individual. The skeletal pathology provides no additional evidence of brucellosis. Instead, the widespread bony changes in skeleton 2568 are diagnostic of diffuse idiopathic skeletal hyperostosis (DISH), a systemic condition of unknown etiology that is characterized by the ossification or calcification of ligaments and enthuses, particularly of the thoracic spine, and which is seen most commonly in men over 50 years of age (<xref rid="B14" ref-type="bibr">14</xref>
). DISH has been reported in numerous ancient and medieval skeletons and is thought to be associated with a privileged and/or sedentary lifestyle—for example, it was seen in the Medici family (<xref rid="B20" ref-type="bibr">20</xref>
). Whether this historical case of brucellosis represents infection through direct contact with an infected animal (e.g., a shepherd exposed to birthing animals) or through ingestion of dairy products remains unclear, although the relatively old age at death and the coexistence of DISH as a potential disease of affluence might favor the latter.</p>
<p>Our findings fit the epidemiological, historical, and geographical contexts in that <italic>B. melitensis</italic>
is most commonly acquired from sheep or goats (<xref rid="B1" ref-type="bibr">1</xref>
) and sheep (and probably also goat) herding has a long history in Sardinia, as evidenced by distinctive genomic signatures in two local breeds of domesticated sheep and the presence of the Sardinian mouflon, which is thought to represent an archaic feral sheep population that reached Europe from the Neolithic domestication center (<xref rid="B21" ref-type="bibr">21</xref>
).</p>
<p>By showing that our medieval <italic>Brucella</italic>
strain is most closely related to recent Italian isolates, we have established the continuity of this zoonotic infection in the region over the centuries. Brucellosis still occurs on the island of Sardinia, although it is now relatively well controlled there compared to other regions of endemicity. Nonetheless, the struggle to control this infection, which has afflicted the peoples of the Mediterranean region since ancient times, is still ongoing. We conclude that metagenomic approaches stand ready to document past infections, shedding light on the emergence, evolution, and spread of <italic>Brucella</italic>
and other microbial pathogens and to inform current and future infectious disease diagnosis and control.</p>
</sec>
<sec sec-type="materials|methods" id="h3"><title>MATERIALS AND METHODS</title>
<sec id="h3.1"><title>Source material.</title>
<p>The source material consisted of 1 of 32 calcified nodules found in the pelvic girdle of an adult male skeleton (sample 2568) that was excavated from 1997 to 1999 from a cemetery in the medieval rural settlement of Geridu (Sorso, Sassari, Italy), in northwest Sardinia. Twenty-five single pit graves were identified in a well-organized part of the cemetery (sector 2500). Stratigraphic analysis identified two distinct burial phases. Phase I (9 single burials) dates to the first half of the 14th century CE; phase II (16 single burials) dates to the final period in which the cemetery was used (1350 to 1400 CE). Following the historical reports, the settlement of Geridu was definitely abandoned in 1426 CE. The sample 2568 remains were retrieved from 1 of the 16 burials dating to the second half of the 14th century CE (<xref rid="B13" ref-type="bibr">13</xref>
). Sex determination was performed on the basis of the morphological features of the skull. Age at death was estimated on the basis of dental wear and sternal rib end modification (<xref rid="B22" ref-type="bibr">22</xref>
). Lesions indicative of pathologies were recorded in accordance with the methods and standards set out in the Global History of Health Project (<xref rid="B23" ref-type="bibr">23</xref>
).</p>
</sec>
<sec id="h3.2"><title>DNA extraction.</title>
<p>DNA extraction and library preparation were carried out in a dedicated ancient DNA laboratory in which no strains of <italic>Brucella</italic>
had ever been cultured, no pathogen-specific PCRs had ever been performed, and in which the handler wore gloves, together with a mask, a gown, and a hood. The surface of the calcified nodule was removed using a drill bit that had been cleaned with bleach to eliminate potential surface contaminants. The undersurface was then removed by drilling at low speed to produce approximately 20 mg of powder. The sample was incubated at 37°C with shaking to demineralize it in 400 µl CTAB (cetyltrimethylammonium bromide) solution and 40 µl proteinase K for 1 week.</p>
<p>DNA was isolated with chloroform using the DNeasy plant minikit (Qiagen United Kingdom), with the following modifications to the manufacturer’s protocol so the kit could be used for historical human tissues. In brief, the demineralized sample was centrifuged at 20,000 × <italic>g</italic>
for 10 min and the supernatant was collected. To homogenize the sample, 400 µl of 0.2 M chloroform was added and the tube was inverted for 10 min. The sample was centrifuged at 6,000 × <italic>g</italic>
for 3 min, and the supernatant was transferred to 2-ml tubes. The manufacturer’s DNeasy plant minikit protocol was followed from step 6 with the following additional modifications. Three volumes of buffer AW1 was added to each sample and incubated at room temperature for 2 to 3 h. After the addition of buffer AW2, the samples were centrifuged for 3 min. DNA was eluted in two 50-µl aliquots (100-µl total). Extracted DNA was quantified in 5 µl of sample using the Qubit high-sensitivity double-stranded DNA (HS dsDNA) assay according to the manufacturer’s instructions (Invitrogen Ltd., Paisley, United Kingdom) and then stored at −20°C until library preparation.</p>
</sec>
<sec id="h3.3"><title>Sequencing.</title>
<p>DNA extracted from sample 2568 was converted into a TruSeq Nano library for sequencing on an Illumina MiSeq sequencer according to the manufacturer’s low-sample protocol (Illumina UK, Little Chesterford, United Kingdom), with the following minor modifications. No fragmentation step was included, given the expectation that ancient DNA would already be heavily fragmented. DNA was end-repaired within the ancient-DNA laboratory, with the modification of incubation for 90 min at 30°C and size selection for <350-bp inserts. Analysis on an Agilent Bioanalyzer 2100 system provided an estimated size distribution of fragments with a peak length of 235 bp.</p>
<p>Once adapters (including bar codes) had been ligated, the sequencing library was moved to a PCR laboratory. In accordance with the manufacturer’s instructions, the library fragments were PCR amplified; however, we used 10 PCR cycles instead of the usual 8. The library was quantified (2 µl per sample) using the Qubit HS dsDNA assay according to the manufacturer’s instructions (Invitrogen Ltd., Paisley, United Kingdom) and then stored at −20°C. The sample 2568 library was diluted to 4 nM, as determined by analysis on an Agilent Bioanalyzer 2100 and using the Qubit HS dsDNA assay, and then pooled in equimolar amounts with 10 other bar-coded libraries (8 from other historical human tissue samples and 2 from blank controls). The entire library pool was then diluted to 12 pM and sequenced on the first MiSeq run using the Illumina MiSeq v2 2 × 250-bp paired-end protocol. In a second MiSeq run, dedicated entirely to the 2568 library, the 4 nM library was diluted to 12 pM without pooling.</p>
</sec>
<sec id="h3.4"><title>Identification of <italic>Brucella</italic>
sequences.</title>
<p>Metagenomic sequence reads from both MiSeq runs using sample 2568 have been deposited in the European Nucleotide Archive (project accession number PRJEB6045). Sequences derived from sample 2568 in the first MiSeq run that had lengths of ≥150 bp were subjected to a BLASTN search against the NCBI NR database, and the results were analyzed with MEGAN (<xref rid="B24" ref-type="bibr">24</xref>
). Reads from all samples on the initial MiSeq run were analyzed with Bowtie2 version 2.1.0 (<xref rid="B25" ref-type="bibr">25</xref>
), allowing only 1 mismatch per 33 bases of the read (under the following settings: --mp 1,1; --ignore-quals; --score-min L,0, −0.033). The reads were mapped against the genomes of the following pathogens: <italic>Plasmodium falciparum</italic>
3D7, <italic>Leishmania infantum</italic>
JPCM5, <italic>Yersinia pestis</italic>
CO92, <italic>Mycobacterium tuberculosis</italic>
H37Rv, and <italic>Brucella melitensis</italic>
16 M (GenBank accession numbers <ext-link ext-link-type="NCBI:nucleotide" xlink:href="AL844501">AL844501</ext-link>
to <ext-link ext-link-type="NCBI:nucleotide" xlink:href="AL844509">AL844509</ext-link>
, <ext-link ext-link-type="NCBI:nucleotide" xlink:href="AE014185">AE014185</ext-link>
to <ext-link ext-link-type="NCBI:nucleotide" xlink:href="AE014188">AE014188</ext-link>
, <ext-link ext-link-type="NCBI:nucleotide" xlink:href="AE001362">AE001362</ext-link>
, <ext-link ext-link-type="NCBI:nucleotide" xlink:href="FR796433">FR796433</ext-link>
to <ext-link ext-link-type="NCBI:nucleotide" xlink:href="FR796468">FR796468</ext-link>
, <ext-link ext-link-type="NCBI:nucleotide" xlink:href="NC_003143">NC_003143</ext-link>
, <ext-link ext-link-type="NCBI:nucleotide" xlink:href="AL123456">AL123456</ext-link>
, <ext-link ext-link-type="NCBI:nucleotide" xlink:href="NC_003317">NC_003317</ext-link>
, and <ext-link ext-link-type="NCBI:nucleotide" xlink:href="NC_003318">NC_003318</ext-link>
).</p>
</sec>
<sec id="h3.5"><title>Phylogenetic placement of <italic>Brucella</italic>
sequences from Geridu at low coverage.</title>
<p>Previously described lineage-defining SNPs (<xref rid="B17" ref-type="bibr">17</xref>
) were used to construct a tree with FastTree 2.7.1 (<xref rid="B26" ref-type="bibr">26</xref>
), using neighbor joining and generalized time-reversible models of nucleotide evolution. Reads from the metagenome were mapped against the reference strain <italic>B. melitensis</italic>
16 M using the default settings in Bowtie2 and the majority base called from each SNP position with no quality filtering. If no base was present at the position, a gap was used. The pplacer suite of programs (<xref rid="B16" ref-type="bibr">16</xref>
) was used to assign the sequence to a position on the tree.</p>
</sec>
<sec id="h3.6"><title>Phylogenetic analysis of <italic>B. melitensis</italic>
strains.</title>
<p>The phylogeny of all <italic>B. melitensis</italic>
strains was analyzed, using information from the PATRIC database (<xref rid="B27" ref-type="bibr">27</xref>
) and a <italic>Brucella</italic>
SNP matrix from the Broad Institute (<uri xlink:type="simple" xlink:href="http://www.broadinstitute.org/">http://www.broadinstitute.org</uri>
). To map these strains on the matrix, sequences of 160 bases surrounding each SNP were taken from the reference strain, <italic>B. melitensis</italic>
16 M, and this fragment was mapped (using Bowtie2) against each strain to ascertain the corresponding base in the genome. If no mapping occurred or the read mapped in two places, a gap was added instead. Using this extended matrix, concatenated SNPs for each strain were then used to construct a tree using FastTree 2.7.1.</p>
</sec>
<sec id="h3.7"><title>Calling SNPs from strains in the Ether clade.</title>
<p>Five modern draft genomes from strains in the Ether clade (UK31/99, F15/06-7, F5/07-239A, Ether, and R3/07-2) were aligned against <italic>B. melitensis</italic>
16 M using Progressive Mauve (<xref rid="B28" ref-type="bibr">28</xref>
), and SNPs were called using the default settings. If any strain had a gap or N, the SNP was discarded. SNPs for the Geridu-1 strain were called from the mapped bam file using Samtools (<xref rid="B29" ref-type="bibr">29</xref>
), with requirements that there was at least 6-fold coverage and that the mutant allele accounted for at least 80% of aligned sequences. The SNPs from Geridu-1 were combined with those from the Ether clade strains, excluding any SNP that occurred at a location where there was less than 6-fold coverage in the Geridu-1 sequence alignment. The remaining 2,332 SNPs (<xref ref-type="supplementary-material" rid="tabS1">Table S1</xref>
) were then used to construct a tree using FastTree 2.7.1 and to produce a pairwise dissimilarity matrix.</p>
</sec>
<sec id="h3.8"><title>Analysis of breakpoints in Geridu-1 and other strains.</title>
<p>From manual scrutiny of the coverage plot, we identified regions in the 16 M reference genome where for a span of >100 bp, no reads mapped from the Geridu-1 genome. To confirm the existence and refine the boundaries of these deletions, the Geridu-1 reads were remapped against 16 M using the --local option of Bowtie2, which allows the beginning and end of reads to be soft-clipped to obtain an improved alignment. The clipped regions of the reads at the edges of candidate deletions were used to identify the breakpoint created by the deletion. The distribution of the breakpoints in other strains was determined by retrieving the sequences flanking the deletion breakpoints in the Geridu-1 strain and performing a BLASTN search of available <italic>B. melitensis</italic>
genomes. Similar approaches were used to determine the identity and distribution of insertion breakpoints associated with IS<italic>11</italic>
.</p>
</sec>
<sec id="h3.9"><title>Nucleotide sequence accession numbers.</title>
<p>Metagenomic sequence reads from this study have been deposited in the European Nucleotide Archive (project accession number <uri xlink:type="simple" xlink:href="http://www.ebi.ac.uk/ena/data/view/PRJEB6045">PRJEB6045</uri>
). The following URL will pull all of the sequences that were used in our searches: <uri xlink:type="simple" xlink:href="http://www.ncbi.nlm.nih.gov/nuccore/AL844501,AL844502,AL844503,AL844504,AL844505,AL844506,AL844507,AL844508,AL844509,AE014185,AE014186,AE014186,AE014187,AE014188,AE001362,FR796433,FR796434,FR796435,FR796436,FR796437,FR796438,NC_003143,AL123456,NC_003317,NC_003318">http://www.ncbi.nlm.nih.gov/nuccore/AL844501,AL844502,AL844503,AL844504,AL844505,AL844506,AL844507,AL844508,AL844509,AE014185,AE014186,AE014186,AE014187,AE014188,AE001362,FR796433,FR796434,FR796435,FR796436,FR796437,FR796438,NC_003143,AL123456,NC_003317,NC_003318</uri>
.</p>
</sec>
</sec>
<sec sec-type="supplementary-material" id="h4"><title>SUPPLEMENTAL MATERIAL</title>
<supplementary-material id="figS1"><label>Figure S1</label>
<caption><p>Phylogenetic tree drawn from published lineage-defining SNPs with the position of the Geridu-1 strain calculated from the initial MiSeq run (~0.7-fold coverage). Download </p>
</caption>
<media xlink:href="mbo003141896sf01.pdf"><caption><p>Figure S1, PDF file, 0.2 MB</p>
</caption>
</media>
</supplementary-material>
<supplementary-material id="figS2"><label>Figure S2</label>
<caption><p>Phylogenetic placement of the Geridu-1 strain with limiting number of reads. Reads that aligned to the <italic>B. melitensis</italic>
16 M genome were subsampled 10 times, and each sample was used to extract SNPs which were used by the program pplacer to assign a lineage on the <italic>Brucella</italic>
tree (see methods). (A) 250 reads; (B) 100 reads. Download </p>
</caption>
<media xlink:href="mbo003141896sf02.pdf"><caption><p>Figure S2, PDF file, 0.1 MB</p>
</caption>
</media>
</supplementary-material>
<supplementary-material id="figS3"><label>Figure S3</label>
<caption><p>Phylogeny of <italic>B. melitensis</italic>
species. The tree is based on an SNP matrix available at the Broad Institute website and <italic>B. melitensis</italic>
genomes downloaded from the PATRIC website (see Materials and Methods). The tree was constructed using FastTree 2 and shows three main clades as well as outliers, which have probably been misidentified. Download </p>
</caption>
<media xlink:href="mbo003141896sf03.pdf"><caption><p>Figure S3, PDF file, 0.5 MB</p>
</caption>
</media>
</supplementary-material>
<supplementary-material id="tabS1"><label>Table S1</label>
<caption><p>Distribution of single-nucleotide polymorphisms among the genomes of the medieval and modern strains in the Ether clade of <italic>Brucella melitensis</italic>
</p>
</caption>
<media xlink:href="mbo003141896st1.pdf"><caption><p>Table S1, PDF file, 0.1 MB.</p>
</caption>
</media>
</supplementary-material>
<supplementary-material id="tabS2"><label>Table S2</label>
<caption><p>Description of SNPs in the <italic>B. melitensis</italic>
Ether clade. The table shows the SNP, position, and gene, as well as any resultant amino acid change. The SNPs shown are only a subset and correspond to locations where there was >6-fold coverage in Geridu-1 sequence alignment.</p>
</caption>
<media xlink:href="mbo003141896st2.pdf"><caption><p>Table S2, PDF file, 0.4 MB.</p>
</caption>
</media>
</supplementary-material>
<supplementary-material id="tabS3"><label>Table S3</label>
<caption><p>Distribution of deletions and IS<italic>711</italic>
insertions among <italic>B. melitensis</italic>
genomes.</p>
</caption>
<media xlink:href="mbo003141896st3.pdf"><caption><p>Table S3, PDF file, 0.1 MB.</p>
</caption>
</media>
</supplementary-material>
</sec>
</body>
<back><fn-group><fn fn-type="other"><p><bold>Citation</bold>
Kay GL, Sergeant MJ, Giuffra V, Bandiera P, Milanese M, Bramanti B, Bianucci R, Pallen MJ. 2014. Recovery of a medieval <italic>Brucella melitensis</italic>
genome using shotgun metagenomics. mBio 5(4):e01337-14. doi:10.1128/mBio.01337-14.</p>
</fn>
</fn-group>
<ack><title>ACKNOWLEDGMENTS</title>
<p>We acknowledge the RAS Legge Regionale 7 agosto 2007, (n) 7, bando 2010 Bando 2010-2011, for funding bioanthropological investigations. We thank Warwick Medical School for funding laboratory and bioinformatics work.</p>
<p>We thank Jackie Chan for storage of samples, Oliver Smith for supplying a drill and for advice on library preparation, Robin Allaby for providing access to the ancient-DNA laboratory, and Nick Loman for advice on phylogenetic placement. We thank the <italic>Brucella</italic>
Group Sequencing Project, Broad Institute of Harvard and MIT, for making prepublication genomes available.</p>
<p>R.B., B.B., and M.J.P. designed the research; M.M., R.B., V.G., P.B., and G.L.K. performed the research; G.L.K., M.J.S., and M.J.P. analyzed the data; and M.J.P. and R.B. wrote the paper.</p>
</ack>
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