MPI für Infektionsbiologie / Department of Molecular Biology |
|Multi locus sequence typing of Chlamydiales: clonal groupings within the obligate intracellular bacteria Chlamydia trachomatis|
|Authors:||Pannekoek, Yvonne; Morelli, Giovanna; Kusecek, Barica; Morre, Servaas A.; Ossewaarde, Jacobus M.; Langerak, Ankie A.; van der Ende, Arie|
|Date of Publication (YYYY-MM-DD):||2008-02-28|
|Title of Journal:||BMC Microbiology|
|Journal Abbrev.:||BMC Microbiol.|
|Sequence Number of Article:||42|
|Copyright:||© 2008 Pannekoek et al; licensee BioMed Central Ltd.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
|Review Status:||not specified|
|Abstract / Description:||Background
The obligate intracellular growing bacterium Chlamydia trachomatis causes diseases like trachoma, urogenital infection and lymphogranuloma venereum with severe morbidity. Several serovars and genotypes have been identified, but these could not be linked to clinical disease or outcome. The related Chlamydophila pneumoniae, of which no subtypes are recognized, causes respiratory infections worldwide. We developed a multi locus sequence typing (MLST) scheme to understand the population genetic structure and diversity of these species and to evaluate the association between genotype and disease.
A collection of 26 strains of C. trachomatis of different serovars and clinical presentation and 18 strains of C. pneumoniae were included in the study. For comparison, sequences of C. abortus, C. psittaci, C. caviae, C. felis, C. pecorum (Chlamydophila), C. muridarum (Chlamydia) and of Candidatus protochlamydia and Simkania negevensis were also included. Sequences of fragments (400 – 500 base pairs) from seven housekeeping genes (enoA, fumC, gatA, gidA, hemN, hlfX, oppA) were analysed. Analysis of allelic profiles by eBurst revealed three non-overlapping clonal complexes among the C. trachomatis strains, while the C. pneumoniae strains formed a single group. An UPGMA tree produced from the allelic profiles resulted in three groups of sequence types. The LGV strains grouped in a single cluster, while the urogenital strains were distributed over two separated groups, one consisted solely of strains with frequent occurring serovars (E, D and F). The distribution of the different serovars over the three groups was not consistent, suggesting exchange of serovar encoding ompA sequences. In one instance, exchange of fumC sequences between strains of different groups was observed. Cluster analyses of concatenated sequences of the Chlamydophila and Chlamydia species together with those of Candidatus Protochlamydia amoebophila and Simkania negevensis resulted in a tree identical to that obtained with 23S RNA gene sequences.
These data show that C. trachomatis and C. pneumoniae are highly uniform. The difference in genetic diversity between C. trachomatis and C. pneumoniae is in concordance with a later assimilation to the human host of the latter. Our data supports the taxonomy of the order of Chlamydiales.
|Comment of the Author/Creator:||This research was partly funded by the Sixth Framework Programme of the European Commission, Proposal/Contract no.: 512061 (Network of Excellence 'European Virtual Institute for Functional Genomics of Bacterial Pathogens'.|
|External Publication Status:||published|
|Communicated by:||Hilmar Fünning|
|Affiliations:||MPI für Infektionsbiologie/Department of Molecular Biology|
|External Affiliations:||Univ Amsterdam, Dept Med Microbiol, Ctr Infect & Immun Amsterdam, NL-1105 AZ Amsterdam, Netherlands.; Free Univ Amsterdam, Med Ctr, Dept Pathol, Immunogenet Lab,Sect Immunogenet Infect Dis, Amsterdam, Netherlands.; Free Univ Amsterdam, Med Ctr, Dept Internal Med, Infect Dis Sect, Amsterdam, Netherlands.; Medisch Centrum Rijnmond, Lab Med Microbiol, Rotterdam, Netherlands.;Erasmus MC, Dept Med Microbiol & Infect Dis, Rotterdam, Netherlands.|
|Identifiers:||ISI:000254367700002 [ID No:1] |
ISSN:1471-2180 [ID No:2]
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