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Identification of a dominant Chlamydia trachomatis strain in patients attending sexual transmitted infection clinic and female sex workers in Tunisia using a high resolution typing method.

Identifieur interne : 000342 ( Main/Exploration ); précédent : 000341; suivant : 000343

Identification of a dominant Chlamydia trachomatis strain in patients attending sexual transmitted infection clinic and female sex workers in Tunisia using a high resolution typing method.

Auteurs : Houda Gharsallah [Tunisie] ; Reinier J M. Bom [Pays-Bas] ; Sylvia M. Bruisten [Pays-Bas] ; Michelle Himschoot [Pays-Bas] ; Olfa Frikha-Gargouri [Tunisie] ; Adnene Hammami [Tunisie]

Source :

RBID : pubmed:27497657

Descripteurs français

English descriptors

Abstract

BACKGROUND

The distribution of Chlamydia trachomatis genotypes in Tunisia was previously studied using the reverse hybridization method. In this study, we used multilocus sequence typing (MLST) to describe Chlamydia trachomatis genetic diversity among heterosexual populations in Tunisia. The obtained sequence types (STs) were compared with those from a heterosexual population from Amsterdam, the Netherlands.

METHODS

Clinical Tunisian patients and female sex workers provided 107 Chlamydia trachomatis positive samples that were used for MLST. Samples from 256 heterosexuals visiting the Amsterdam STI clinic were included as a reference group. Six highly variable genetic regions including the ompA gene were amplified and sequenced. The ST numbers were derived from a Chlamydia typing database (http://mlstdb.uu.se) and used to draw minimum spanning trees.

RESULTS

ompA sequencing detected 7 genotypes among the Tunisian populations of which genotype E was the most prevalent (66.3%). This genotype E resolved into 23 different STs and among these the ST3 was predominant (53.5%). MLST displayed 43 STs, of which 28 (65%) were new in the database. Minimum spanning tree analysis of all Tunisian samples identified 4 clusters of which one formed a clonal cluster with samples presenting the most prevalent ST3. When comparing samples from the Tunisian and Dutch populations in one minimum spanning tree, there was little overlap between the Chlamydia trachomatis samples.

CONCLUSION

The CT-hrMLST scheme allowed us to identify that the Tunisian distribution was dominated by one genotype E (ST3) strain which is also highly prevalent in many other countries worldwide.


DOI: 10.1016/j.meegid.2016.08.002
PubMed: 27497657


Affiliations:


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<term>Adult (MeSH)</term>
<term>Chlamydia Infections (epidemiology)</term>
<term>Chlamydia Infections (microbiology)</term>
<term>Chlamydia trachomatis (classification)</term>
<term>Chlamydia trachomatis (genetics)</term>
<term>Cluster Analysis (MeSH)</term>
<term>Female (MeSH)</term>
<term>Genetic Variation (MeSH)</term>
<term>Genotype (MeSH)</term>
<term>Heterosexuality (MeSH)</term>
<term>Humans (MeSH)</term>
<term>Male (MeSH)</term>
<term>Multilocus Sequence Typing (MeSH)</term>
<term>Netherlands (epidemiology)</term>
<term>Sequence Analysis, DNA (MeSH)</term>
<term>Sex Workers (MeSH)</term>
<term>Tunisia (epidemiology)</term>
<term>Young Adult (MeSH)</term>
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<term>Adulte (MeSH)</term>
<term>Analyse de regroupements (MeSH)</term>
<term>Analyse de séquence d'ADN (MeSH)</term>
<term>Chlamydia trachomatis (classification)</term>
<term>Chlamydia trachomatis (génétique)</term>
<term>Femelle (MeSH)</term>
<term>Génotype (MeSH)</term>
<term>Humains (MeSH)</term>
<term>Hétérosexualité (MeSH)</term>
<term>Infections à Chlamydia (microbiologie)</term>
<term>Infections à Chlamydia (épidémiologie)</term>
<term>Jeune adulte (MeSH)</term>
<term>Mâle (MeSH)</term>
<term>Pays-Bas (épidémiologie)</term>
<term>Travailleurs du sexe (MeSH)</term>
<term>Tunisie (épidémiologie)</term>
<term>Typage par séquençage multilocus (MeSH)</term>
<term>Variation génétique (MeSH)</term>
</keywords>
<keywords scheme="MESH" qualifier="classification" xml:lang="en">
<term>Chlamydia trachomatis</term>
</keywords>
<keywords scheme="MESH" qualifier="epidemiology" xml:lang="en">
<term>Chlamydia Infections</term>
<term>Netherlands</term>
<term>Tunisia</term>
</keywords>
<keywords scheme="MESH" qualifier="genetics" xml:lang="en">
<term>Chlamydia trachomatis</term>
</keywords>
<keywords scheme="MESH" qualifier="génétique" xml:lang="fr">
<term>Chlamydia trachomatis</term>
</keywords>
<keywords scheme="MESH" qualifier="microbiologie" xml:lang="fr">
<term>Infections à Chlamydia</term>
</keywords>
<keywords scheme="MESH" qualifier="microbiology" xml:lang="en">
<term>Chlamydia Infections</term>
</keywords>
<keywords scheme="MESH" qualifier="épidémiologie" xml:lang="fr">
<term>Infections à Chlamydia</term>
<term>Pays-Bas</term>
<term>Tunisie</term>
</keywords>
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<term>Adult</term>
<term>Cluster Analysis</term>
<term>Female</term>
<term>Genetic Variation</term>
<term>Genotype</term>
<term>Heterosexuality</term>
<term>Humans</term>
<term>Male</term>
<term>Multilocus Sequence Typing</term>
<term>Sequence Analysis, DNA</term>
<term>Sex Workers</term>
<term>Young Adult</term>
</keywords>
<keywords scheme="MESH" qualifier="classification" xml:lang="fr">
<term>Adulte</term>
<term>Analyse de regroupements</term>
<term>Analyse de séquence d'ADN</term>
<term>Chlamydia trachomatis</term>
<term>Femelle</term>
<term>Génotype</term>
<term>Humains</term>
<term>Hétérosexualité</term>
<term>Jeune adulte</term>
<term>Mâle</term>
<term>Travailleurs du sexe</term>
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<div type="abstract" xml:lang="en">
<p>
<b>BACKGROUND</b>
</p>
<p>The distribution of Chlamydia trachomatis genotypes in Tunisia was previously studied using the reverse hybridization method. In this study, we used multilocus sequence typing (MLST) to describe Chlamydia trachomatis genetic diversity among heterosexual populations in Tunisia. The obtained sequence types (STs) were compared with those from a heterosexual population from Amsterdam, the Netherlands.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>METHODS</b>
</p>
<p>Clinical Tunisian patients and female sex workers provided 107 Chlamydia trachomatis positive samples that were used for MLST. Samples from 256 heterosexuals visiting the Amsterdam STI clinic were included as a reference group. Six highly variable genetic regions including the ompA gene were amplified and sequenced. The ST numbers were derived from a Chlamydia typing database (http://mlstdb.uu.se) and used to draw minimum spanning trees.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>RESULTS</b>
</p>
<p>ompA sequencing detected 7 genotypes among the Tunisian populations of which genotype E was the most prevalent (66.3%). This genotype E resolved into 23 different STs and among these the ST3 was predominant (53.5%). MLST displayed 43 STs, of which 28 (65%) were new in the database. Minimum spanning tree analysis of all Tunisian samples identified 4 clusters of which one formed a clonal cluster with samples presenting the most prevalent ST3. When comparing samples from the Tunisian and Dutch populations in one minimum spanning tree, there was little overlap between the Chlamydia trachomatis samples.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>CONCLUSION</b>
</p>
<p>The CT-hrMLST scheme allowed us to identify that the Tunisian distribution was dominated by one genotype E (ST3) strain which is also highly prevalent in many other countries worldwide.</p>
</div>
</front>
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<li>Tunisie</li>
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