J Arthropod-Borne Dis, December 2014, 8(2): 139–146 MH Davami et al.: Molecular Survey on … 139 Original Article Molecular Survey on Detection of Leishmania Infection in Rodent Reservoirs in Jahrom District, Southern Iran Mohammad Hassan Davami 1, Mohammad Hossein Motazedian 2, *Mohsen Kalantari 3, Qasem Asgari 2, Iraj Mohammadpour 2, Abdolreza Sotoodeh-Jahromi 1, Kavous Solhjoo 1, Morteza Pourahmad 4 1Department of Medical Microbiology, School of Medicine, Jahrom University of Medical Sciences, Jahrom, Iran 2Department of Parasitology and Mycology, Shiraz University of Medical Sciences, Shiraz, Iran 3Department of Public Health, Mamasani Paramedical School, Shiraz University of Medical Sciences, Shiraz, Iran 4Department of Internal Medicine, Jahrom University of Medical Sciences, Jahrom, Iran (Received 9 June 2012; accepted 8 Oct 2013) Abstract Background: Zoonotic Cutaneous Leishmaniasis (ZCL) is endemic in many parts of Iran. Recently its incidence is considerable in different parts of Jahrom district, in Fars Province, southern Iran. The aims of our study were to in- vestigate the prevalence of leishmania infection, and identify and characterize the Leishmania species present, among the rodents by molecular methods in a new endemic focus of ZCL, in an urban and rural area of the Jahrom district, Fars Province, southern Iran. Methods: From May to November 2010), 55 rodents in four regions of Jahrom focus were caught and checked for leishmania infection by the microscopical examination of liver, spleen, ears, and footpads’ smears. Results: Overall 18 Meriones persicus, 15 Tatera indica, 14 Mus musculus, and 8 Rattus rattus were caught. Totally, four (16.5%) and two (13.3%) of the Me. persicus and Ta. indica, but only one of Mu. musculus and Ra. rattus were found smear-positive for leishmania amastigotes, respectively. In the nested-PCR assay 8 (14.6%) smears were found positive for Leishmania major, none was found positive for any other Leishmania species. Sequencing based detection of Leishmania confirmed the microscopic and PCR findings. All positive specimens were shown 95–96% similarity with L. major Friedlin. Conclusion: Tatera indica and Me. persicus are incriminated as the main ‘reservoir’ hosts of L. major in the rural area of Jahrom, moreover, Mu. musculus and Ra. rattus have the minor but remarkable role in the maintenance of the disease in the urban regions of Jahrom focus. Keywords: Rodent, Leishmania, PCR, Sequencing, Iran Introduction The leishmaniases are parasitic diseases with an extensive variety of clinical symptoms that have an effect on over 12 million people in 88 countries, mainly in the tropical and subtrop- ical situated regions, as well as Iran (Javadian et al. 1976, Mohebali et al. 2004, Guedes et al. 2008). Zoonotic Cutaneous Leishmaniasis (ZCL) takes place in many rural endemic foci in dif- ferent parts of Iran (Yaghoobi-Ershadi et al. 2005). Sandflies (Diptera: Phlebotominae) have been naturally found infected with Leishmania major and considered as the sole vectors of leishmaniasis. Moreover, gerbil rodents (Muri- dae: Gerbillinae) are the reservoir hosts of ZCL in Iran (Azizi et al. 2011 a). Rodents, as the ‘reservoir’ hosts, are the main bases in the ep- *Corresponding author: Dr Mohsen Kalantari, E- mail: kalantari22@yahoo.com http://jad.tums.ac.ir Published Online: April 09, 2014 J Arthropod-Borne Dis, December 2014, 8(2): 139–146 MH Davami et al.: Molecular Survey on … 140 idemiology and control strategy of the ZCL (Pourmohammadi et al. 2008). Due to high sim- ilarity of different species of the parasite, var- ious sources of Leishmania DNA such as kinetoplast DNA (kDNA), ssu rRNA, ITS1 and repetitive sequences have been used for mo- lecular characterizations (Van Eys et al. 1992, Noyes et al. 1998, Parvizi and Ready 2008, Davami et al. 2011, Ghasemian et al. 2011). Recently, PCR-based assays are character- istically used to detect Leishmania species in patients, vectors and reservoir hosts (Rodgers et al. 1990, Bulat et al. 1992, Parhizkari et al. 2011). Materials and Methods Study Area Fars Province placed in southern Iran and covers an area of about 122,400 km². Jahrom district is located in the south-east of prov- ince and situated at 30° 4' 45" North, 51° 43' 29" East, and 1050m above the sea level (Fars Budget and Planning Organization 2000). Due to a favorable ecological conditions for vectors and reservoirs of leishmaniasis, Jahrom has al- ways been considered as one of the foci of cu- taneous and visceral leishmaniasis in south of Iran (Fig. 1) (Davami et al. 2010, Davami et al. 2011). Collection and Examination of Rodents Between May to November 2010, rodents were caught alive in wire traps on agricultural plantations, surrounding and near the houses in four regions including Jahrom City and three villages in the area including Mousavieh, Ghotb-Abad and Fath-Abad. Each trap was set in the evening and checked in the next early morning. There were set at least 50 ‘trap-nights’ per months. Each rodent was identified to species (Eisenberg and Redford 1999), killed by over-anesthesia and dissect- ed, so that four impressions smears (two of the liver, spleen, ear and footpad) could be prepared. Each smear was fixed in methanol, Giemsa-stained and checked for amastigotes under a light microscope (Mohebali et al. 2004). DNA Extraction All specimens were checked in a nested- PCR assay for Leishmania kDNA. Therefore, each dry smear was scraped from the slides and mixed with 200μl of lysis buffer [1 mM EDTA, 50 mM Tris-HCl (pH 7.6, 1% (v/v) Tween 20] containing 5μl of a proteinase K solution which already had 23mg/ ml of en- zyme. The specimen was incubated for 2 h at 56 ºC or 12h at 37 ºC before 75μl of a phenol: chloroform: isoamyl-alcohol solution (25:24: 1, by vol.) was added (Motazedian et al. 2002). After being shaken vigorously, specimen was centrifuged at 6000× g for 10min. DNA in the supernatant solution was precipitated with 300μl of cold ethanol, resuspended in 100μl of double distilled water, and stored at 4 ºC before using in the PCR- assay (Noyes et al. 1998). Nested-PCR assay The specific and sensitive nested-PCR was used to amplify the variable area of the minicircle kDNA of Leishmania spp. in the rodent liver, spleen, ear and footpad as pre- viously described by Noyes et al. (1998) with slight modification (Moemenbellah-Fard et al. 2003, Davami et al. 2011, Ghasemian et al. 2011). The first-round (external) primers were CSB1XR (ATTTTTCGCGATTTTCGCAGA ACG) and CSB2XF (CGAGTAGCAGAAA CTCCCGTTCA). A reaction mixture con- taining of 1.5 mM of MgCl2, 2 mM of dntp, 2.5μL of 10 X PCR buffer (Boehringer Mann- heim, Mannheim, Germany), 1 unit of Taq DNA polymerase (Cinagene, Tehran), and 10pmol of each primer were used in a total reaction volume of 25μL including 5μL of DNA sam- ple. The second-round (internal) primers were 13Z (ACTGGGGGTTGGTGTAAAA TAG) and LIR (TCGCAGAACGCCCCT). The re- action mixture was used in a total volume of 30μL including 2μL of DNA product of the http://jad.tums.ac.ir Published Online: April 09, 2014 J Arthropod-Borne Dis, December 2014, 8(2): 139–146 MH Davami et al.: Molecular Survey on … 141 first round. These mixtures were amplified in a programmable thermocycler (Eppendorf AG (Mastercycler gradient), Germany) for 5min at 94 ºC (1 cycle) followed by 30 cycles at 94 ºC for 30 seconds, 55 ºC for 60 seconds and 72 ºC for 1.5min followed by a final elon- gation step at 72 ºC for 5 minutes. The WHO reference strains of L. major (MHOM/IL/67/ LV561) was used as standard DNA. A band of 560bp indicated that L. major kDNA is present in the sample (Davami et al. 2011). Electrophoresis A 6μl sample of each second-round prod- uct of PCR was subjected to electrophoresis in 1.5% agarose gel, stained with ethidium bro- mide and visualized by ultraviolet trans- illumination (Davami et al. 2011). Sequencing The PCR products of all positive samples were purified by Gel Purification Kit (Accu Prep®, Cat. No. k-3035-1, Bioneer, USA). The strands of amplified DNA were sequenced (Both forward and reverse sequencing) with the PCR primers on an automated sequencer (Ap- plied Biosystems 377XL). The nucleotide ho- mologies of the sequenced products were inves- tigated with the TritrypDB blast programme. The characterization of consensus sequences was performed by using FASTA formatted se- quences aligned with the Chromas programme. Results The 55 rodents trapped over the study be- longed to four species; totally, 18 (32.7%) Me. persicus, 15 (27.3%) Ta. indica, 14 (25.5%) Mu. musculus, and 8 (14.5%) Ra. rattus were caught from Jahrom district (Table 1). Amastigotes were seen in the liver, spleen, ear and/or footpad smears of seven (12.7%) of the rodents- three (16.7%) of the Me. persicus, two (13.3%) of the T. indica, one (7.1%) of the Mu. Musculus, and one (12.5%) of the Ra. Rattus- caught in Jahrom district (Table 2). The nested-PCR results showed that 8 (14.6%) of rodents- four (22.2%) of the Me. persicus, two (13.3%) of the Ta. indica, one (7.1%) of the Mu. Musculus, and one (12.5%) of the Ra. Rattus- were positive for leishmania kDNA, Also 10 out of the 220 smears belonged to different parts of rodents organs (liver, spleen, ear and/or footpad) were found positive, separately (Table 2,3). All the kDNA detected appeared to come from L. major (Fig. 2). Using TritrypDB se- quence analysis against Trypanosomatidae species, the target sequence of PCR products showed 95–96% similarity with L. major strain IranJWmaj (GenBank accession no. AB67 8349.1) (Fig. 3). Fig. 1. Map of Iran, showing the locations of Fars Province and the city of Jahrom Fig. 2. The results of the nested PCR-based amplifi- cation of kDNA recovered either from a negative control (lane 2), and the reference samples of Leishmania major (lane 3), or positive and negative smears of liver, spleen, ear, or footpad of Mus musculus (lane 4, 5 and 6), Rattus rattus (lanes 7, 8), Meriones persicus (lanes 9, 10 and 11), and Tatera indica (lanes 12 and 13). Molecular-weight markers were run in lanes 1 http://jad.tums.ac.ir Published Online: April 09, 2014 J Arthropod-Borne Dis, December 2014, 8(2): 139–146 MH Davami et al.: Molecular Survey on … 142 Table 1. The species, numbers and geographical distributions of the rodents caught in Jahrom district No. and (%) of rodents caught Study areas Meriones persicus Tatera indica Mus musculus Rattus rattus All species *Jahrom 14 (77.8) 13 (86.7) 6 (42.9) 8 (100) 41 (74.5) Fath-Abad 3 (16.7) 0 (0) 3 (21.4) 0 (0) 6 (10.9) Mousavieh 0 (0) 2 (13.3) 4 (28.6) 0 (0) 6 (10.9) Ghotb-Abad 1 (5.5) 0 (0) 1 (7.1) 0 (0) 2 (3.6) All 18 (100) 15 (100) 14 (100) 8 (100) 55 (100) * Urban and suburban areas of Jahrom Table 2. The prevalences of leishmania infection in the rodents, as revealed by microscopy and, nested-PCR based detection of Leishmania major kDNA in Jahrom district No. and (%) of rodents found positive Meriones persicus Tatera indica Mus musculus Rattus rattus All species Study areas *Ch. ** Mic. PCR Ch. Mic. PCR Ch. Mic. PCR Ch. Mic. PCR Ch. Mic. PCR ***Jahrom 14 1(7.1) 2(14.3) 13 0(0) 0(0) 6 0 (0) 0 (0) 8 1(12.5) 1(12.5) 41 2(4.9) 3 (7.3) Fath-Abad 3 2(2.67) 2(66.7) 0 0 (0) 0(0) 3 0 (0) 0 (0) 0 0 (0) 0 (0) 6 2(33.3) 2 (33.3) Mousavieh 0 0(0) 0(0) 2 2(100) 2(100) 4 1 (25) 1(25) 0 0 (0) 0 (0) 6 3 (50) 3 (50) Ghotb-Abad 1 0(0) 0(0) 0 0 (0) 0 (0) 1 0 (0) 0 (0) 0 0 (0) 0 (0) 2 0 (0) 0 (0) All 18 3(16.7) 4 (22.2) 15 2(13.3) 2(13.3) 14 1(7.1) 1(7.1) 8 1(12.5) 1(12.5) 55 7 (12.7) 8 (14.6) *Checked, **Microscopy, ***Urban and suburban areas of Jahrom district Table 3. The prevalence of leishmania infection in the studied organs of rodents, as revealed by the nested-PCR in Jahrom district Studied organs of rodents (No. and %) Footpad Ear Liver Spleen All Species *Ch. ** Pos. (%) Ch. Pos. (%) Ch. Pos. (%) Ch. Pos. (%) Ch. Pos. (%) Meriones persicus 18 2 (11.1) 18 1 (5.6) 18 2 (11.1) 18 0 (0) 72 5 (6.9) Tatera indica 15 2 (13.3) 15 1 (6.7) 15 0 (0) 15 0 (0) 60 3 (5) Mus musculus 14 1 (7.1) 14 0 (0) 14 0 (0) 14 0 (0) 56 1 (1.8) Rattus rattus 8 0 (0) 8 0 (0) 8 1 (12.5) 8 0 (0) 32 1 (3.1) All 55 5 (9.1) 55 2 (3.6) 55 3 (5.5) 55 0 (0) 220 10 (4.6) *Checked, **Positive Fig. 3. Alignment analysis of the kDNA of Leishmania major isolated from Mus musculus foot-pad, L. major strain Iran J Wmaj (GenBank accession no. AB678349.1) and L. major isolate MHOM/IL/67/LV561 (accession no. AF308685.1). Target sequence of PCR product of Mu. musculus showed 95% similarity with L. major strains, of IranJWmaj. Stars indicate the different regions between the isolates http://jad.tums.ac.ir Published Online: April 09, 2014 Iran J Wmaj (Accession No. AB678349.1) L. major isolated from Mus musculus MHOM/ IL/ 67/ LV561 (Accession No. AF308685.1) J Arthropod-Borne Dis, December 2014, 8(2): 139–146 MH Davami et al.: Molecular Survey on … 143 Discussion Detection of the mammalian ‘reservoir’ hosts is one of the main problems in front of researchers who make an effort to evaluate the epidemiology of ZCL to control the disease (Pourmohammadi et al. 2008). In the present study using a specific and sensitive nested- PCR on scrapings from Giemsa-stained smears of rodent tissues, the overall prevalence of rodents with leishmania infection was out- come as 14.6% that showed the higher infec- tion than microscopical observations (12.7%). Different biochemical, immunological, and mo- lecular assays such as iso-enzyme electropho- resis, monoclonal antibodies, and PCR have been used to characterize the causative agents of leishmaniasis (Fakhar et al. 2008, Parvizi et al. 2008, Fakhar et al. 2010, Pourmohammadi et al. 2010, Azizi et al. 2011b). Usuallym, in the leshmanial detections molecular assays are more sensitive than the other diagnostic meth- ods such as micriscopical examinations or cul- ture (Fakhar et al. 2011). As it is doable to use the molecular techniques to detect and iden- tify the leishmania parasites in fixed and stained smears utilized for microscopy, re- cently, those methods chiefly based on nest- ed-PCR and sequencing have been remark- ably raised to detect the leishmania infec- tions (Noyes et al. 1998). In Iran, Rhombomys opimus, Ta. indica, Me. lybicus, and Me. hurrianae have been re- ported as the major ‘reservoir’ hosts of ZCL in endemic foci of the central and north-east, west and south-west, south, and south-eastern parts of Iran, respectively (Yaghoobi-Ershadi et al. 1996, Moemenbellah-Fard et al. 2003, Parvizi et al. 2005, Asgari et al. 2007). Meriones lybicus, Me. persicus, Me. Hur- rianae and Ta. indica have been found positive for Leishmania kDNA in Fars Prov- ince (Rassi et al. 2001, Moemenbellah-Fard et al. 2003, Rassi et al. 2006, Mehrabani et al. 2007, Mehrabani et al. 2011, Parhizkari et al. 2011, Azizi et al. 2012). In our study, the results of rodents trapped in Jahrom district of Fars Province, indicated that Ta. indica and Me. persicus were the most common rodents in that part of the province, and the results of the nested-PCR showed that 22.2% and 13.3% of mentioned rodents were found to be positive for L. major. Me. persicus and Ta. indica are the most important mamma- lian hosts of L. major in the rural areas of Jahrom district. No R. opimus and Me. hur- rianae were caught in the present study in Jahrom. Nesokia indica, Gerbillus nanus have been described as an accidental, main or a proba- ble ‘reservoir’ hosts in different parts of Iran (Pourmohammadi et al. 2008, Azizi et al. 2011a, Azizi et al. 2011c, Azizi et al. 2012). In our investigation any Nesokia or Gerbilus species were not caught. Mu. Musculus has been found naturally in- fected with L. major in Fars Province (Par- hizkari et al. 2011). In the present study, the footpad of one out of 14 (7.1%) Mu. Musculus were found to be both microscpical and mo- lecular positive. Recently Motazedian et al. has isolated the causative agents of ZCL (L. major) from Ra. norvegicus in Fars Province (Motazedian et al. 2010). In this investigation one liver of Ra. rattus caught in urban area of Jahrom district was found to be infected with Leishmania kDNA, the present report appears to be the first to describe natural infection of Ra. rattus with L. major in Iran. Mu. Musculus and Ra. rattus infection with L. major may explain why, in recent years, ZCL causative has been remarkably increased in some urban areas of Iran (Razmjou et al. 2009, Davami et al. 2010). The importance of the ‘reservoir’ hosts in the epidemiology of ZCL appreciated with the local sandflies feeding on that species and the infectivity of the leishmania infections http://jad.tums.ac.ir Published Online: April 09, 2014 J Arthropod-Borne Dis, December 2014, 8(2): 139–146 MH Davami et al.: Molecular Survey on … 144 in each host species (Motazedian et al. 2006). Even though Mu. musculus and Ra. rattus were found infected with L. major, but some reports show that the prevalence of leishmania infection have been observed from those which caught from other regions of Iran (Parhizkari et al. 2011). There was no evidence of L. infantum or L. tropica in the tested smears. This study includes the first isolation and characterisa- tion of L. major from Iranian Me. persicus and Ta. indica, caught in an area where zo- onotic CL has recently occurred. In Jahrom, whatever the time of the year, more than half of all rodents attracted to wal- nut-baited traps are infected with L. major. If local sandflies take their bloodmeals from both rodents and humans, there is clearly much scope for transmission of these parasites to humans. Conclusion Based on observing of amastigotes in livers, spleens, ears, and footpads smears, using a high sensitive and specific nested-PCR designed for kDNA of Leishmania, and comparing the kDNA of sequenced products with GenBank that confirmed the highest homology of 95– 96% with L. major, concluded that the spe- cies isolated form rodents is L. major. Acknowledgements The authors are grateful to the office of the Vice-Chancellor for Research at Jahrom and Shiraz University of Medical Sciences for fi- nancial support, and the Department of Para- sitology and Mycology in the Medical School of Shiraz University of Medical Sciences for facilitating the PCR assays. They also thank to Dr R Zarei for her assistance in the iden- tification of the rodents caught, and to Dr B Sarkari, for his critical review of the manuscript. The authors declare that there is no conflict of interests. 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