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Detection, molecular typing and phylogenetic analysis of Leishmania isolated from cases of leishmaniasis among Syrian refugees in Lebanon

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dc.contributor.author Tokajian, Sima
dc.contributor.author Khalifeh, Ibrahim
dc.contributor.author Salloum, Tamara
dc.date.accessioned 2018-06-25T10:57:11Z
dc.date.available 2018-06-25T10:57:11Z
dc.date.copyright 2016 en_US
dc.identifier.issn 2405-6731 en_US
dc.identifier.uri http://hdl.handle.net/10725/8094
dc.description.abstract Leishmania is a parasitic protozoan with more than two-dozen species causing the disease leishmaniasis. It is transmitted to humans through the bite of an infected female phlebotomine sand-fly vector. In the past two years the incidence of leishmaniasis has been drastically increasing in Lebanon. This was in parallel with the deterioration of the security in Syria forcing thousands to flee and seek shelter in poorly maintained refugee camps and collective shelters. Cutaneous leishmaniasis (CL) is now considered a public health problem, but its epidemiology has not been fully elucidated. To our knowledge, this is the first study comparing two different molecular methods for the detection and identification of Leishmania tropica in Lebanon. Two molecular typing methods of 39 FFPE Leishmania isolates were used: the ITS1-PCR RFLP and the nested ITS1-5.8S rDNA gene amplification followed by sequencing and phylogenetic analysis. The efficiency of these two techniques in Leishmania identification was compared and the phylogenetic relationships among these isolates were illustrated based on the neighbor-joining (NJ) method. The results were statistically correlated with the parasitic index (PI). The DNA storage in formalin-fixed paraffin embedded (FFPE) tissues was assessed as well. The parasites identified were all L. tropica as determined by both techniques. ITS1-5.8S rDNA gene based typing proved to be more sensitive in the detection of parasites (positive in 69.2% of the isolates) as opposed to the ITS1-PCR RFLP method that was successful in identifying L. tropica in only 43.6% of the isolates. Sequencing and phylogenetic analysis revealed high levels of heterogeneity. A statistically significant correlation was observed between PI and the results of the nested ITS1-5.8S rDNA gene PCR. Genotyping at the species level is essential for monitoring the relative frequency of CL in the Mediterranean area that is correlated to three different Leishmania species (Leishmania infantum, Leishmania major and L. tropica), each characterized by distinct epidemiological features. The obtained results highlight the need to find a universally accepted diagnostic tool for Leishmania typing. en_US
dc.language.iso en en_US
dc.title Detection, molecular typing and phylogenetic analysis of Leishmania isolated from cases of leishmaniasis among Syrian refugees in Lebanon en_US
dc.type Article en_US
dc.description.version Published en_US
dc.author.school SAS en_US
dc.author.idnumber 199736770 en_US
dc.author.department Natural Sciences en_US
dc.description.embargo N/A en_US
dc.relation.journal Parasite Epidemiology and Control en_US
dc.journal.volume 1 en_US
dc.journal.issue 2 en_US
dc.article.pages 159-168 en_US
dc.keywords Leishmania en_US
dc.keywords ITS1 en_US
dc.keywords 5.8S rDNA gene en_US
dc.keywords RFLP en_US
dc.identifier.doi https://doi.org/10.1016/j.parepi.2016.02.002 en_US
dc.identifier.ctation Salloum, T., Khalifeh, I., & Tokajian, S. (2016). Detection, molecular typing and phylogenetic analysis of Leishmania isolated from cases of leishmaniasis among Syrian refugees in Lebanon. Parasite Epidemiology and Control, 1(2), 159-168. en_US
dc.author.email stokajian@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php en_US
dc.identifier.url https://www.sciencedirect.com/science/article/pii/S2405673115300477#! en_US
dc.author.affiliation Lebanese American University en_US


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