Comparative microsatellite typing of new world leishmania infantum reveals low heterogeneity among populations and its recent old world origin

Leishmania infantum (syn. L. chagasi) is the causative agent of visceral leishmaniasis (VL) in the New World (NW) with endemic regions extending from southern USA to northern Argentina. The two hypotheses about the origin of VL in the NW suggest (1) recent importation of L. infantum from the Old Wor...

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Veröffentlicht in:PLoS neglected tropical diseases 2011-06, Vol.5 (6), p.e1155-e1155
Hauptverfasser: Kuhls, Katrin, Alam, Mohammad Zahangir, Cupolillo, Elisa, Ferreira, Gabriel Eduardo M, Mauricio, Isabel L, Oddone, Rolando, Feliciangeli, M Dora, Wirth, Thierry, Miles, Michael A, Schönian, Gabriele
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container_issue 6
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container_title PLoS neglected tropical diseases
container_volume 5
creator Kuhls, Katrin
Alam, Mohammad Zahangir
Cupolillo, Elisa
Ferreira, Gabriel Eduardo M
Mauricio, Isabel L
Oddone, Rolando
Feliciangeli, M Dora
Wirth, Thierry
Miles, Michael A
Schönian, Gabriele
description Leishmania infantum (syn. L. chagasi) is the causative agent of visceral leishmaniasis (VL) in the New World (NW) with endemic regions extending from southern USA to northern Argentina. The two hypotheses about the origin of VL in the NW suggest (1) recent importation of L. infantum from the Old World (OW), or (2) an indigenous origin and a distinct taxonomic rank for the NW parasite. Multilocus microsatellite typing was applied in a survey of 98 L. infantum isolates from different NW foci. The microsatellite profiles obtained were compared to those of 308 L. infantum and 20 L. donovani strains from OW countries previously assigned to well-defined populations. Two main populations were identified for both NW and OW L. infantum. Most of the NW strains belonged to population 1, which corresponded to the OW MON-1 population. However, the NW population was much more homogeneous. A second, more heterogeneous, population comprised most Caribbean strains and corresponded to the OW non-MON-1 population. All Brazilian L. infantum strains belonged to population 1, although they represented 61% of the sample and originated from 9 states. Population analysis including the OW L. infantum populations indicated that the NW strains were more similar to MON-1 and non-MON-1 sub-populations of L. infantum from southwest Europe, than to any other OW sub-population. Moreover, similarity between NW and Southwest European L. infantum was higher than between OW L. infantum from distinct parts of the Mediterranean region, Middle East and Central Asia. No correlation was found between NW L. infantum genotypes and clinical picture or host background. This study represents the first continent-wide analysis of NW L. infantum population structure. It confirmed that the agent of VL in the NW is L. infantum and that the parasite has been recently imported multiple times to the NW from southwest Europe.
doi_str_mv 10.1371/journal.pntd.0001155
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L. chagasi) is the causative agent of visceral leishmaniasis (VL) in the New World (NW) with endemic regions extending from southern USA to northern Argentina. The two hypotheses about the origin of VL in the NW suggest (1) recent importation of L. infantum from the Old World (OW), or (2) an indigenous origin and a distinct taxonomic rank for the NW parasite. Multilocus microsatellite typing was applied in a survey of 98 L. infantum isolates from different NW foci. The microsatellite profiles obtained were compared to those of 308 L. infantum and 20 L. donovani strains from OW countries previously assigned to well-defined populations. Two main populations were identified for both NW and OW L. infantum. Most of the NW strains belonged to population 1, which corresponded to the OW MON-1 population. However, the NW population was much more homogeneous. A second, more heterogeneous, population comprised most Caribbean strains and corresponded to the OW non-MON-1 population. 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This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Kuhls K, Alam MZ, Cupolillo E, Ferreira GEM, Mauricio IL, et al. (2011) Comparative Microsatellite Typing of New World Leishmania infantum Reveals Low Heterogeneity among Populations and Its Recent Old World Origin. 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L. chagasi) is the causative agent of visceral leishmaniasis (VL) in the New World (NW) with endemic regions extending from southern USA to northern Argentina. The two hypotheses about the origin of VL in the NW suggest (1) recent importation of L. infantum from the Old World (OW), or (2) an indigenous origin and a distinct taxonomic rank for the NW parasite. Multilocus microsatellite typing was applied in a survey of 98 L. infantum isolates from different NW foci. The microsatellite profiles obtained were compared to those of 308 L. infantum and 20 L. donovani strains from OW countries previously assigned to well-defined populations. Two main populations were identified for both NW and OW L. infantum. Most of the NW strains belonged to population 1, which corresponded to the OW MON-1 population. However, the NW population was much more homogeneous. A second, more heterogeneous, population comprised most Caribbean strains and corresponded to the OW non-MON-1 population. 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It confirmed that the agent of VL in the NW is L. infantum and that the parasite has been recently imported multiple times to the NW from southwest Europe.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>21666787</pmid><doi>10.1371/journal.pntd.0001155</doi><oa>free_for_read</oa></addata></record>
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source Public Library of Science (PLoS) Journals Open Access; MEDLINE; DOAJ Directory of Open Access Journals; EZB-FREE-00999 freely available EZB journals; PubMed Central; PubMed Central Open Access
subjects Americas - epidemiology
Biology
Cluster Analysis
Evolution, Molecular
Genetic aspects
Genotype
Genotypes
Heterogeneity
Humans
Identification and classification
Leishmania
Leishmania donovani
Leishmania donovani - classification
Leishmania donovani - genetics
Leishmania donovani - isolation & purification
Leishmania infantum
Leishmania infantum - classification
Leishmania infantum - genetics
Leishmania infantum - isolation & purification
Leishmaniasis, Visceral - epidemiology
Leishmaniasis, Visceral - parasitology
Medical research
Medicine
Microsatellite Repeats
Microsatellites (Genetics)
Molecular Epidemiology
Molecular Typing - methods
Parasites
Parasitic diseases
Polymorphism, Genetic
Population
Population genetics
Population structure
Tropical diseases
Vector-borne diseases
title Comparative microsatellite typing of new world leishmania infantum reveals low heterogeneity among populations and its recent old world origin
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