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BMC Infectious Diseases
Published in: BMC Infectious Diseases 1/2019

Open Access 01-12-2019 | Cutaneous Leishmaniasis | Research article

Leishmania cytochrome b gene sequence polymorphisms in southern Iran: relationships with different cutaneous clinical manifestations

Authors: Iraj Mohammadpour, Gholam Reza Hatam, Farhad Handjani, Farzaneh Bozorg-Ghalati, Daniel PourKamal, Mohammad Hossein Motazedian

Published in: BMC Infectious Diseases | Issue 1/2019

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Abstract

Background

Cutaneous leishmaniasis (CL) caused by Leishmania species, is a geographically extensive disease that infects humans and animals. CL is endemic in half of the 31 provinces of Iran, with 29,201 incidence cases reported in Fars province from 2010 to 2015. CL is polymorphic and may result in lesions characterized by different clinical features. Parasite genetic diversity is proposed to be one of the factors affecting the clinical outcome and lesion characteristics in CL patients. However, there is still very limited data regarding the genetic variation of Leishmania spp. based on the sequencing of Cytochrome b (Cyt b) gene.

Methods

All patients originated from endemic regions in Fars province. The amplification of the Cyt b gene from isolates of 100 patients with disparate clinical forms of CL was accomplished using Nested-PCR. Sequence analysis of the amplified Cyt b was used to scrutinize the genetic variations among Leishmania isolates and connect the results with clinical pictures. The clinical demonstrations were basically of two types, typical and atypical lesions. Molecular phylogenetic tree was constructed using the Neighbor-Joining method, with species/strains from this study compared to species/strains from other geographical regions.

Results

Leishmania major was identified as the predominant infecting Leishmania spp. (86% of cases), with the remainder of cases being infected by Leishmania tropica. Clinical examination of patients revealed 12 different clinical CL forms. Among Leishmania samples analyzed, five distinct haplotypes were recognized: three in L. major and two in L. tropica. We found a correlation between clinical outcomes and Cyt b sequence variation of Leishmania spp. involved. Moreover, we observed a higher presence of polymorphisms in L. major compared with L. tropica. This difference may be due to the different eco-epidemiologies of both species, with L. tropica being an anthroponosis compared to L. major, which is a zoonosis.

Conclusions

The sequence analysis of Cyt b gene from 25 L. major and L. tropica strains demonstrated genetic variability of L. major and L. tropica causing CL in southern Iran, and a feasible connection amid the genetic heterogeneity of the parasite, geographical source and clinical appearance of the disease in human was detected.
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Metadata
Title
Leishmania cytochrome b gene sequence polymorphisms in southern Iran: relationships with different cutaneous clinical manifestations
Authors
Iraj Mohammadpour
Gholam Reza Hatam
Farhad Handjani
Farzaneh Bozorg-Ghalati
Daniel PourKamal
Mohammad Hossein Motazedian
Publication date
01-12-2019
Publisher
BioMed Central
Published in
BMC Infectious Diseases / Issue 1/2019
Electronic ISSN: 1471-2334
DOI
https://doi.org/10.1186/s12879-018-3667-7

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