Development and Application of a High Resolution Melt (HRM) based test for the Rapid Screening of Leishmania infantum Genotypes

Abstract

INTRODUCTION Leishmaniasis includes anthropo zoonotic infectious diseases caused by a protozoan of the Leishmania genus, associated with different clinical manifestations, affecting both humans and other vertebrates, including dogs The Mediterranean basin, including Italy, is considered an endemic area for both visceral and cutaneous leishmaniasis caused by L infantum The multi locus enzyme electrophoresis ( based on the electrophoretic mobility of several enzymes from promastigotes cultures, is considered the reference method for parasite typing Through this method, about 45 L infantum zymodemes (also termed MON) have been identified in humans in the Mediterranean basin 1 Among these, L infantum MON 1 is the most widespread, representing about 70 of all identified strains In Italy, canine infections showed a high prevalence of MON 1 91 with the remaining composed almost exclusively of MON 72 2 Since MLEE technique is cumbersome, time consuming and requires parasites isolation, several biomolecular approaches have been developed In particular, we identified the SNP 390 T>G in malic enzyme ( gene as a potential marker to differentiate the most common L infantum genotype, i e 390 T (corresponding to zymodemes MON 1 72 201 from all others. AIMS This study aimed to develop a Rapid Genotype Screening ( assay for L infantum genetic characterization in clinical samples using high resolution melt ( analysis, exploiting the polymorphism 390 T>G in the ME gene

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