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Two Nonrecombining Sympatric Forms of the Human Malaria Parasite Plasmodium ovale Occur Globally

Identifieur interne : 000953 ( Istex/Checkpoint ); précédent : 000952; suivant : 000954

Two Nonrecombining Sympatric Forms of the Human Malaria Parasite Plasmodium ovale Occur Globally

Auteurs : Colin J. Sutherland [Royaume-Uni] ; Naowarat Tanomsing ; Debbie Nolder ; Mary Oguike ; Charlie Jennison ; Sasithon Pukrittayakamee ; Christiane Dolecek [Viêt Nam] ; Tran Tinh Hien [Viêt Nam] ; Virgilio E. Do Rosário [Portugal] ; Ana Paula Arez [Portugal] ; João Pinto [Portugal] ; Pascal Michon [Papouasie-Nouvelle-Guinée] ; Ananias A. Escalante [États-Unis] ; Francois Nosten [Royaume-Uni, Thaïlande] ; Martina Burke ; Rogan Lee [Australie] ; Marie Blaze ; Thomas Dan Otto [Royaume-Uni] ; John W. Barnwell [États-Unis] ; Arnab Pain [Royaume-Uni] ; John Williams ; Nicholas J. White [Royaume-Uni] ; Nicholas P. J. Day [Royaume-Uni] ; Georges Snounou [France, Singapour] ; Peter J. Lockhart [Nouvelle-Zélande] ; Peter L. Chiodini [Royaume-Uni] ; Mallika Imwong ; Spencer D. Polley [Royaume-Uni]

Source :

RBID : ISTEX:934AE9AC3FE9987720CDD21CD1D7141C54A6538D

Abstract

Background. Malaria in humans is caused by apicomplexan parasites belonging to 5 species of the genus Plasmodium. Infections with Plasmodium ovale are widely distributed but rarely investigated, and the resulting burden of disease is not known. Dimorphism in defined genes has led to P. ovale parasites being divided into classic and variant types. We hypothesized that these dimorphs represent distinct parasite species. Methods. Multilocus sequence analysis of 6 genetic characters was carried out among 55 isolates from 12 African and 3 Asia-Pacific countries. Results. Each genetic character displayed complete dimorphism and segregated perfectly between the 2 types. Both types were identified in samples from Ghana, Nigeria, São Tomé, Sierra Leone, and Uganda and have been described previously in Myanmar. Splitting of the 2 lineages is estimated to have occurred between 1.0 and 3.5 million years ago in hominid hosts. Conclusions. We propose that P. ovale comprises 2 nonrecombining species that are sympatric in Africa and Asia. We speculate on possible scenarios that could have led to this speciation. Furthermore, the relatively high frequency of imported cases of symptomatic P. ovale infection in the United Kingdom suggests that the morbidity caused by ovale malaria has been underestimated.

Url:
DOI: 10.1086/652240


Affiliations:


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ISTEX:934AE9AC3FE9987720CDD21CD1D7141C54A6538D

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<name sortKey="Otto, Thomas Dan" sort="Otto, Thomas Dan" uniqKey="Otto T" first="Thomas Dan" last="Otto">Thomas Dan Otto</name>
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<name sortKey="Barnwell, John W" sort="Barnwell, John W" uniqKey="Barnwell J" first="John W." last="Barnwell">John W. Barnwell</name>
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<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Centers for Disease Control and Prevention, Atlanta, Georgia</wicri:regionArea>
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<region type="state">Géorgie (États-Unis)</region>
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<name sortKey="Pain, Arnab" sort="Pain, Arnab" uniqKey="Pain A" first="Arnab" last="Pain">Arnab Pain</name>
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<country xml:lang="fr">Royaume-Uni</country>
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<name sortKey="Williams, John" sort="Williams, John" uniqKey="Williams J" first="John" last="Williams">John Williams</name>
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<wicri:noCountry code="subField">University</wicri:noCountry>
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<name sortKey="Day, Nicholas P J" sort="Day, Nicholas P J" uniqKey="Day N" first="Nicholas P. J." last="Day">Nicholas P. J. Day</name>
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<name sortKey="Snounou, Georges" sort="Snounou, Georges" uniqKey="Snounou G" first="Georges" last="Snounou">Georges Snounou</name>
<affiliation></affiliation>
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<name sortKey="Lockhart, Peter J" sort="Lockhart, Peter J" uniqKey="Lockhart P" first="Peter J." last="Lockhart">Peter J. Lockhart</name>
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<wicri:orgArea>Hospital for Tropical Diseases</wicri:orgArea>
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<name sortKey="Imwong, Mallika" sort="Imwong, Mallika" uniqKey="Imwong M" first="Mallika" last="Imwong">Mallika Imwong</name>
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<wicri:noCountry code="subField">University</wicri:noCountry>
</affiliation>
</author>
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<name sortKey="Polley, Spencer D" sort="Polley, Spencer D" uniqKey="Polley S" first="Spencer D." last="Polley">Spencer D. Polley</name>
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<country>Royaume-Uni</country>
<placeName>
<settlement type="city">Londres</settlement>
<region type="country">Angleterre</region>
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<monogr></monogr>
<series>
<title level="j">The Journal of Infectious Diseases</title>
<title level="j" type="abbrev">The Journal of Infectious Diseases</title>
<idno type="ISSN">0022-1899</idno>
<idno type="eISSN">1537-6613</idno>
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<publisher>The University of Chicago Press</publisher>
<date type="published" when="2010-05-15">2010-05-15</date>
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<biblScope unit="issue">10</biblScope>
<biblScope unit="page" from="1544">1544</biblScope>
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<div type="abstract">Background. Malaria in humans is caused by apicomplexan parasites belonging to 5 species of the genus Plasmodium. Infections with Plasmodium ovale are widely distributed but rarely investigated, and the resulting burden of disease is not known. Dimorphism in defined genes has led to P. ovale parasites being divided into classic and variant types. We hypothesized that these dimorphs represent distinct parasite species. Methods. Multilocus sequence analysis of 6 genetic characters was carried out among 55 isolates from 12 African and 3 Asia-Pacific countries. Results. Each genetic character displayed complete dimorphism and segregated perfectly between the 2 types. Both types were identified in samples from Ghana, Nigeria, São Tomé, Sierra Leone, and Uganda and have been described previously in Myanmar. Splitting of the 2 lineages is estimated to have occurred between 1.0 and 3.5 million years ago in hominid hosts. Conclusions. We propose that P. ovale comprises 2 nonrecombining species that are sympatric in Africa and Asia. We speculate on possible scenarios that could have led to this speciation. Furthermore, the relatively high frequency of imported cases of symptomatic P. ovale infection in the United Kingdom suggests that the morbidity caused by ovale malaria has been underestimated.</div>
</front>
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<affiliations>
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<country>
<li>Australie</li>
<li>France</li>
<li>Nouvelle-Zélande</li>
<li>Papouasie-Nouvelle-Guinée</li>
<li>Portugal</li>
<li>Royaume-Uni</li>
<li>Singapour</li>
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<li>Arizona</li>
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<li>Nouvelle-Galles du Sud</li>
<li>Oxfordshire</li>
<li>Île-de-France</li>
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<li>Londres</li>
<li>Oxford</li>
<li>Paris</li>
<li>Sydney</li>
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<name sortKey="Sutherland, Colin J" sort="Sutherland, Colin J" uniqKey="Sutherland C" first="Colin J." last="Sutherland">Colin J. Sutherland</name>
<name sortKey="Sutherland, Colin J" sort="Sutherland, Colin J" uniqKey="Sutherland C" first="Colin J." last="Sutherland">Colin J. Sutherland</name>
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<name sortKey="Escalante, Ananias A" sort="Escalante, Ananias A" uniqKey="Escalante A" first="Ananias A." last="Escalante">Ananias A. Escalante</name>
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<name sortKey="Barnwell, John W" sort="Barnwell, John W" uniqKey="Barnwell J" first="John W." last="Barnwell">John W. Barnwell</name>
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<name sortKey="Nosten, Francois" sort="Nosten, Francois" uniqKey="Nosten F" first="Francois" last="Nosten">Francois Nosten</name>
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<country name="Australie">
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<country name="France">
<region name="Île-de-France">
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</country>
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