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Reconstructing Colonization Dynamics of the Human Parasite Schistosoma mansoni following Anthropogenic Environmental Changes in Northwest Senegal

Identifieur interne : 002909 ( Main/Exploration ); précédent : 002908; suivant : 002910

Reconstructing Colonization Dynamics of the Human Parasite Schistosoma mansoni following Anthropogenic Environmental Changes in Northwest Senegal

Auteurs : Frederik Van Den Broeck [Belgique] ; Gregory E. Maes [Belgique, Australie] ; Maarten H. D. Larmuseau [Belgique] ; David Rollinson [Royaume-Uni] ; Ibrahima Sy [France] ; Djibril Faye [Sénégal] ; Filip A. M. Volckaert [Belgique] ; Katja Polman [Belgique] ; Tine Huyse [Belgique]

Source :

RBID : PMC:4537236

Descripteurs français

English descriptors

Abstract

Background

Anthropogenic environmental changes may lead to ecosystem destabilization and the unintentional colonization of new habitats by parasite populations. A remarkable example is the outbreak of intestinal schistosomiasis in Northwest Senegal following the construction of two dams in the ‘80s. While many studies have investigated the epidemiological, immunological and geographical patterns of Schistosoma mansoni infections in this region, little is known about its colonization history.

Methodology/Principal Findings

Parasites were collected at several time points after the disease outbreak and genotyped using a 420 bp fragment of the mitochondrial cytochrome c oxidase subunit 1 gene (cox1) and nine nuclear DNA microsatellite markers. Phylogeographic and population genetic analyses revealed the presence of (i) many genetically different haplotypes at the non-recombining mitochondrial marker and (ii) one homogenous S. mansoni genetic group at the recombining microsatellite markers. These results suggest that the S. mansoni population in Northwest Senegal was triggered by intraspecific hybridization (i.e. admixture) between parasites that were introduced from different regions. This would comply with the extensive immigration of infected seasonal agricultural workers from neighboring regions in Senegal, Mauritania and Mali. The spatial and temporal stability of the established S. mansoni population suggests a swift local adaptation of the parasite to the local intermediate snail host Biomphalaria pfeifferi at the onset of the epidemic.

Conclusions/Significance

Our results show that S. mansoni parasites are very successful in colonizing new areas without significant loss of genetic diversity. Maintaining high levels of diversity guarantees the adaptive potential of these parasites to cope with selective pressures such as drug treatment, which might complicate efforts to control the disease.


Url:
DOI: 10.1371/journal.pntd.0003998
PubMed: 26275049
PubMed Central: 4537236


Affiliations:


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Le document en format XML

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<term>Microsatellite Repeats</term>
<term>Phylogeography</term>
<term>Population Dynamics</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr">
<term>ADN des helminthes</term>
<term>Activités humaines</term>
<term>Analyse de regroupements</term>
<term>Animaux</term>
<term>Dynamique des populations</term>
<term>Environnement</term>
<term>Humains</term>
<term>Phylogéographie</term>
<term>Régulation de l'expression des gènes codant pour des enzymes</term>
<term>Répétitions microsatellites</term>
<term>Théorème de Bayes</term>
<term>Variation génétique</term>
</keywords>
<keywords scheme="Wicri" type="geographic" xml:lang="fr">
<term>Sénégal</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front>
<div type="abstract" xml:lang="en">
<sec id="sec001">
<title>Background</title>
<p>Anthropogenic environmental changes may lead to ecosystem destabilization and the unintentional colonization of new habitats by parasite populations. A remarkable example is the outbreak of intestinal schistosomiasis in Northwest Senegal following the construction of two dams in the ‘80s. While many studies have investigated the epidemiological, immunological and geographical patterns of
<italic>Schistosoma mansoni</italic>
infections in this region, little is known about its colonization history.</p>
</sec>
<sec id="sec002">
<title>Methodology/Principal Findings</title>
<p>Parasites were collected at several time points after the disease outbreak and genotyped using a 420 bp fragment of the mitochondrial cytochrome c oxidase subunit 1 gene (
<italic>cox</italic>
1) and nine nuclear DNA microsatellite markers. Phylogeographic and population genetic analyses revealed the presence of (i) many genetically different haplotypes at the non-recombining mitochondrial marker and (ii) one homogenous
<italic>S</italic>
.
<italic>mansoni</italic>
genetic group at the recombining microsatellite markers. These results suggest that the
<italic>S</italic>
.
<italic>mansoni</italic>
population in Northwest Senegal was triggered by intraspecific hybridization (i.e. admixture) between parasites that were introduced from different regions. This would comply with the extensive immigration of infected seasonal agricultural workers from neighboring regions in Senegal, Mauritania and Mali. The spatial and temporal stability of the established
<italic>S</italic>
.
<italic>mansoni</italic>
population suggests a swift local adaptation of the parasite to the local intermediate snail host
<italic>Biomphalaria pfeifferi</italic>
at the onset of the epidemic.</p>
</sec>
<sec id="sec003">
<title>Conclusions/Significance</title>
<p>Our results show that
<italic>S</italic>
.
<italic>mansoni</italic>
parasites are very successful in colonizing new areas without significant loss of genetic diversity. Maintaining high levels of diversity guarantees the adaptive potential of these parasites to cope with selective pressures such as drug treatment, which might complicate efforts to control the disease.</p>
</sec>
</div>
</front>
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