Phylogeographic evidence of cognate recognition site patterns and transformation efficiency differences in H. pylori: theory of strain dominance

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dc.contributor.authorMaldonado-Contreras, Anaen
dc.contributor.authorMane, Shrinivasrao P.en
dc.contributor.authorZhang, Xue-Songen
dc.contributor.authorPericchi, Luisen
dc.contributor.authorAlarcón, Teresaen
dc.contributor.authorContreras, Monicaen
dc.contributor.authorLinz, Bodoen
dc.contributor.authorBlaser, Martin J.en
dc.contributor.authorDomínguez-Bello, María G.en
dc.date.accessioned2013-10-04T13:53:22Zen
dc.date.available2013-10-04T13:53:22Zen
dc.date.issued2013-09-19en
dc.date.updated2013-10-04T13:53:22Zen
dc.description.abstractBackground: Helicobacter pylori has diverged in parallel to its human host, leading to distinct phylogeographic populations. Recent evidence suggests that in the current human mixing in Latin America, European H. pylori (hpEurope) are increasingly dominant at the expense of Amerindian haplotypes (hspAmerind). This phenomenon might occur via DNA recombination, modulated by restriction-modification systems (RMS), in which differences in cognate recognition sites (CRS) and in active methylases will determine direction and frequency of gene flow. We hypothesized that genomes from hspAmerind strains that evolved from a small founder population have lost CRS for RMS and active methylases, promoting hpEurope’s DNA invasion. We determined the observed and expected frequencies of CRS for RMS in DNA from 7 H. pylori whole genomes and 110 multilocus sequences. We also measured the number of active methylases by resistance to in vitro digestion by 16 restriction enzymes of genomic DNA from 9 hpEurope and 9 hspAmerind strains, and determined the direction of DNA uptake in co-culture experiments of hspAmerind and hpEurope strains. Results: Most of the CRS were underrepresented with consistency between whole genomes and multilocus sequences. Although neither the frequency of CRS nor the number of active methylases differ among the bacterial populations (average 8.6 ± 2.6), hspAmerind strains had a restriction profile distinct from that in hpEurope strains, with 15 recognition sites accounting for the differences. Amerindians strains also exhibited higher transformation rates than European strains, and were more susceptible to be subverted by larger DNA hpEurope-fragments than vice versa. Conclusions: The geographical variation in the pattern of CRS provides evidence for ancestral differences in RMS representation and function, and the transformation findings support the hypothesis of Europeanization of the Amerindian strains in Latin America via DNA recombination.en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationBMC Microbiology. 2013 Sep 19;13(1):211en
dc.identifier.doihttps://doi.org/10.1186/1471-2180-13-211en
dc.identifier.urihttp://hdl.handle.net/10919/23869en
dc.language.isoenen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.holderAna Maldonado-Contreras et al.; licensee BioMed Central Ltd.en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titlePhylogeographic evidence of cognate recognition site patterns and transformation efficiency differences in H. pylori: theory of strain dominanceen
dc.title.serialBMC Microbiologyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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