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Journal of Clinical Microbiology, September 2002, p. 3391-3397, Vol. 40, No. 9
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.9.3391-3397.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Practical Approach for Typing Strains of Leishmania infantum by Microsatellite Analysis

Béatrice Bulle,1 Laurence Millon,1 Jean-Mathieu Bart,1 Montserrat Gállego,2 Françoise Gambarelli,3 Montserrat Portús,2 Lee Schnur,4 Charles L. Jaffe,4 Salceda Fernandez-Barredo,5 José María Alunda,5 and Renaud Piarroux1*

Santé Environnement Rural, Université de Franche-Comté, 25000 Besançon,1 Laboratoire de Parasitologie-Mycologie, Centre Hospitalier Universitaire La Timone, 13385 Marseille Cedex, France,3 Department of Parasitology, The Hebrew University-Hadassah Medical School, Jerusalem 91220, Israel,4 Departament de Microbiologia i Parasitologia Sanitàries, Facultat de Farmàcia, Barcelona,2 Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain5

Received 8 March 2002/ Returned for modification 6 May 2002/ Accepted 30 June 2002

Currently the universally accepted standard procedure for characterizing and identifying strains of Leishmania is isoenzyme analysis. However, in the Mediterranean area, despite their very wide geographical distribution, most Leishmania infantum strains belong to zymodeme MON-1. In order to increase our understanding of polymorphism in strains of L. infantum, we developed PCR assays amplifying 10 microsatellites and sequenced PCR products. The discriminative power of microsatellite analysis was tested by using a panel of 50 L. infantum strains collected from patients and dogs from Spain, France, and Israel, including 32 strains belonging to zymodeme MON-1, 8 strains belonging to zymodemes MON-24, MON-29, MON-33, MON-34, or MON-80, and 10 untyped strains. Five of the microsatellites were polymorphic, revealing 22 genotypes, whereas the five remaining microsatellites were not variable. In particular, MON-1 strains could be separated into 13 different closely related genotypes. MON-33 and MON-34 strains also gave two additional genotypes closely related to MON-1, while MON-29, MON-24, and MON 80 strains exhibited more divergent genotypes. Among the foci examined, the Catalonian focus displayed a high polymorphism, probably reflecting isoenzyme polymorphism, while the Israeli focus exhibited a low polymorphism that could be consistent with the recent reemergence and rapid spread of canine leishmaniasis in northern and central Israel. The strains originating from the south of France and the Madrid, Spain, area displayed significant microsatellite polymorphism even though they were monomorphic by isoenzyme analysis. In conclusion, microsatellite polymorphism exhibits a high discriminative power and appears to be suitable for characterization of closely related strains of L. infantum in epidemiological studies.

* Corresponding author. Mailing address: Laboratoire de Parasitologie-Mycologie, CHU Jean Minjoz, Boulevard Fleming, 25030 Besançon Cedex, France. Phone: 33 3 81 66 82 86. Fax: 33 3 81 66 89 14. E-mail: renaud.piarroux{at}ufc-chu.univ-fcomte.fr.

Journal of Clinical Microbiology, September 2002, p. 3391-3397, Vol. 40, No. 9
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.9.3391-3397.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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