Comparative Genotyping of Echinococcus granulosus Infecting Livestock in Turkey and Iran/Turkiye ve Iran da Ciftlik Hayvanlarina Bulasan Echinococcus granulosus'un Karsilastirmali Genotiplenmesi.
Cystic echinococcosis (CE) is one of the most important zoonotic parasitic diseases which is caused by the larval stage of Echinococcus granulosus (1). The adult form of this parasite lives in the intestinal tract of canidae as the definite hosts, and humans and herbivores act as intermediate hosts. The intermediate hosts become infected through ingestion of food contaminated with the eggs of these helminthes, passed in the dog's feces (2). Apart from the great morbidity and mortality of the disease in humans, the disease causes significant economic losses in the livestock (3).
E. granulosus contains a complex of different strains that represent diversity in the pattern of the life cycle and their host types. Up to now, 10 genotypes of this parasite have been identified, using molecular methods and in particular the sequencing of mitochondrial DNA (mtDNA) (4). E. granulosus has recently been classified in four main groups: sensu stricto (G1-G3 genotypes), equinus (G4), ortleppi (G5), and canadensis (G6-G10) (5). Echinococcus felidis, isolated from South African lions, are classified in a separate group (6). Apart from the G4 genotype, all other strains of E. granulosus have been identified as the cause of human CE. The genotypes G1 and G3 are the most common genotypes identified in livestock and human all over the world (7,8).
The infection has been reported from all of the Middle Eastern countries and in the meantime, Iran and Turkey are considered as hyper-endemic areas for human CE (9-11). About 1% of the surgeries performed in medical centers of Iran are due to hydatid cyst (12). Studies which have been conducted in different areas of Iran reported the seroprevalence rate of 1.2 to 21.4% for human CE and a prevalence of 1.7 to 70% for hydatid cyst among livestock (13). The main transmission pattern of the disease in Iran is involving dogs and sheep, whereas animals such as goats, cattle, wild boars, and camels are also contributing to different degrees to the life cycle of the parasite (14,15).
Both Turkey and Iran are located in the hyperendemic region of CE, and the disease is widespread in these two countries. There are some reports on the genotyping of E. granulosus in various intermediate hosts including humans in different geographical regions of Turkey and Iran. Utuk et al. (16) characterized different isolates of E. granulosus in East and Southeast regions of Turkey, using polymerase chain reaction-restriction fragment length polymorphism analysis of ribosomal ITS1 fragment and DNA sequencing of cox1 gene. They came to the conclusion that the predominant genotype of E. granulosus in Turkey is the common sheep strain (G1 genotype) which is able to infect humans, cattle, sheep, goats, camels as well as the dog as the definitive host. In another molecular study in Turkey, Eryildiz et al. (17) after collecting 58 E. granulosus isolates from humans and animals in the province of Edirne, they used ITS1 fragments and nad1 genes for characterization and DNA sequencing of cox1 and nad1 genes for genotyping of human and animal E. granulosus isolates. Their study indicated only two genotypes: G1 (sheep strain) and G7 (pig strain) with a predominance G1 strain. Based on their sequence analysis, they identified eight haplotypes of Echinococcus species in their study.
The prevalence of infection in cattle and sheep in Turkey has been reported to be 39.7% and 58.6%, respectively (18,19). During the 2001-2005, about 14.789 human cases of hydatidosis have been recorded by the Ministry of Health and Hospitals in Turkey (17). Eastern regions of Turkey are considered as a high-risk area for CE (20). In a study in Kars's slaughterhouse, an eastern province in Turkey in the neighborhood of Iran, the rate of infection with hydatid cysts was found to be 31.25%, 63.85% and 25.11% in cattle, sheep, and goats, respectively (21).
To integrate and incorporate information related to morphological taxonomy, molecular genetics, and evolutionary ecology of E. granulosus, the knowledge and a better understanding of biodiversity among different genotypes of this parasite are needed. Determination of the dominant genotypes of the parasite in different regions of the world would be necessary for providing an appropriate and effective prevention and controlling measurements (22).
Considering the fact that import and export of livestock have recently been increased between borders of two neighboring countries, Turkey and Iran, as two main foci of both human and animal CE in the Middle East, and given that there has not been a comparative genotyping study of E. granulosus in these regions, the current study aimed to find out and compare the genotypic diversity of E. granulosus of livestock in two neighboring areas, Van Province from Turkey and East Azerbaijan Province from Iran.
The study was conducted in two regions from two countries with almost similar climatic conditions; Van province from Turkey located in the east of Van Lake which is a part of the coldest region in Turkey, and East Azerbaijan province as a cold area located on the Sahand Mountain range of Iran in the southeast of Urmia Lake (Figure 1).
East Azerbaijan is located in Iranian Azerbaijan, bordering with Armenia and Republic of Azerbaijan with the geographical coordinates of 38[degrees] 28' 45.1020'' N and 47[degrees] 3' 50.9040'' Bonab city is located in the Azerbaijan region. Because of its extensive and large pastures, its livestock numbers are significant compared to other cities in the province. It has a large industrial slaughterhouse and high daily intake capacity, which plays an important role in providing meat and livestock products of the region and also the country.
Van is one of the eastern provinces of Turkey located in neighboring Iran at latitude 38[degrees] 29' 40 N, longitude of 43[degrees] 22' 59 E and altitude of 1.725 meters in Turkey. Van has a harsh continental climate with cold, snowy winters and warm, dry summers. Rainfall occurs mostly during the spring and autumn. Because of Van Lake, the climate of this city can be changed between terrestrial and Mediterranean climate of Central Anatolia and Southeast Anatolia regions (23). Therefore, like the region introduced in Iran, it has similar climate conditions and, is an active and leading province in livestock breeding and production of livestock products in Turkey. A recently described rare sheep breed, Norduz, is mainly raised in a region of the same name in Gurpinar County of Van province (24). The study was approved by the Research Ethics Committee of Shiraz University of Medical Sciences (SUMS, Iran).
A total of 90 livestock liver and lung organs infected with hydatid cyst from two areas; Van city of Turkey (30 samples, including 15 sheep and 15 cattle) and Bonab city in East Azerbaijan Province of Iran (60 samples, including 30 sheep and 30 cattle) were obtained. The samples were collected from industrial slaughterhouses of Bonab and Van cities. Protoscolices (PSCs) were collected from the hydatid cyst fluid and after 3 time washes with phosphate buffered saline; the precipitated PSCs were frozen. Also, germinal layers of the cyst were carefully released from the outer host capsules, and were stored at -20 [degrees]C until use.
Extraction of Genomic DNA from Isolates
The genomic DNA from either germinal layers or PSCs were extracted, using a DNA extraction kit (YTA, Yekta Tajhiz Azma, Iran), based on the manufactures instructions and also modifications, previously introduced by the authors (25).
Polymerase Chain Reaction and Gel Electrophoresis
For all 90 samples collected from these two countries, polymerase chain reaction (PCR) was performed targeting a 450 bp and 550 bp fragments of cox1 and nad1 of the mitochondrial DNA respectively, using appropriate primers (26,27). The characteristics of the primers used and the genomic regions of the targets are presented in Table 1.
The cycling parameters for the amplification of both genomic pieces was: 1x (5', 95 [degrees]C)+ 40x (45", 94 [degrees]C+35" 51 [degrees]C+45" 72 [degrees]C)+ 1x (10', 72 [degrees]C).
PCR products were separated on a 1.5% agarose gel, and the obtained bands were visualized and recorded by a ultraviolet detector (Bio-Rad, USA).
Of the total 90 available PCR products, 49 samples including 19 samples from Turkey (10 sheep and 9 cattle) and 30 samples from Iran (15 samples from each animal) were selected in terms of the quality of the resulting band on the electrophoresis gel and purified from the gel by EasyPure Quick Gel Extraction Kit (TRANS, TransGen Biotech, South Korea), based on the manufacturer's instructions. The purified products were sequenced for both cox1 and nad1 fragments from both directions using the same primers which were used in the PCR.
The sequences of E. granulosus isolates from both countries were aligned and compared, using BioEdit and also the BLAST program. Moreover, the obtained sequences were compared with those of available related sequences in the GenBank. Maximum likelihood tree was constructed based on the Tamura-Nei model, using the MEGA 7.0 software. Taenia solium (accession no: AB086256) was used as the out-group.
All gDNA isolates from collected 90 hydatid cysts from two countries were subjected to molecular analysis targeting both cox1 and nad1 genomic fragments and the resulting PCR product showed replication of the target genes. Figure 2 shows the PCR products of cox1 and nad1 genes in a few of the evaluated samples. From all 90 evaluated samples, 49 of them with the highest quality in the resulting band on the electrophoresis gel were selected and sequenced, and the resulting sequences were deposited in the GenBank database with accession numbers which are shown in Table 2. All of the 30 samples (100%) from Iran were found to be the genotype G1 strain. Among the samples from Turkey, 15 samples (78.9%) were identified as G1 and only one sample (5.3%) corresponded to the genotype G3 strain.
Moreover, two samples had not any homologous to the related sequences in the GenBank, and one sample had similarity to the Echinococcus granulosus from Armenia (KX020349). Therefore, these three samples from Turkey were considered as genotypes G1/G3 strain. All isolates of sheep and cattle from both countries clustered in one group within 5 different haplotypes.
Forty-four samples from both countries were homologous to the E. granulosus sensu stricto G1 from Turkey (MF544127) and one sample from Iran was homologous to the E. granulosus G1 from Argentina (MG672258) described earlier. The third haplotype in our study was the only sample from Turkey (MH542404) which had similarity with the E. granulosus sensu stricto G3 from Turkey (MG682536) described earlier. Three of our samples from Turkey (MH542399, MH542406, and MH542395) were placed in two separate haplotypes compared to the rest of the samples (Table 3 and Figure 3, 4). The nad1 sequences were not available for these three isolates and if available, they could be useful in the phylogenetic analyses.
Phylogenetic analysis of the sequences of two cox1 and nad1 genes and alignment of the sequences with available related sequences in the GenBank revealed that the intra-species genetic variation were 0.0-0.6% and 0.0-1.4% for cox1 and nad1, respectively, while the polymorphism variation between the isolates or in other words, the isolates sharing the same haplotype was 0.0 (Figure 5, 6).
The Middle East countries have long been considered as important foci of both human and animal CE. The metacestodes of E. granulosus has been reported in almost all countries of the region, but its prevalence is higher in Iran, Turkey, and Iraq in comparison with the rest of the countries in the region (28).
Various mitochondrial and nuclei genomes have been used for molecular evaluation and to determine the genotype of E. granulosus. Regarding phylogenetic taxonomy of E. granulosus among closely related species, mtDNA has been reported more efficient than nuclear genomes due to the rapid sequence evolution and large datasets derived from mitochondrial genomes (29). The mitochondrial genes; including cox1, nad1, and atp6, as well as the fragment of the 12S rRNA gene have been used to identify the genotypes in different isolates. Findings of Rostami Nejad et al. (30) study on genetic diversity of E. granulosus in different hosts, revealed G1 and G6 genotypes in cattle, camels, sheep, buffalo and goats in different geographic areas of Iran. Likewise, the internal transcribed spacer (ITS1) gene region has also been utilized for genotypic analysis of this parasite (31). In two separate studies, Ahmadi and Dalimi (32) and Harandi et al. (33) used ITS1 region gene to genotype the E. granulosus isolates. They found a similarity between strains in sheep and camel with cattle and humans.
However, cox1 and nad1 mitochondr i a genes, have be en considered as the main and the best options for molecular characterization of CE. For distinction of intra- and interspecific variants, the gene cox1 gene, can be used as a significant evolutionary marker (34).
Mahami-Oskouei et al. (35) used cox1 and nad1 genes to investigate the novel single-nucleotide polymorphism and reported that the G1 genotype with 27 haplotypes was the main strain in human, sheep, goat, cattle and dog isolates. Their study showed that cross transmission of sheep-dog strain is circulating among potential intermediate/definitive hosts with heterogeneity traits of Echinococcus in Iran and Turkey.
In the present study, we selected both cox1 and nad1 genomic fragments as the target and the resulting PCR product showed successful replication of the target genes. Recently, it has been reported that the differentiation between G1 and G3 genotypes for some cases is not possible and the identified genotypes has been reported as G1/G3 strain (36). In a recent study, carried out by Kinkar et al. (8), nad5 fragment has been introduced for proper differentiation of E. granulosus sensu stricto genotypes G1 and G3. Findings of the current study demonstrated the G1 strain as the dominant strain of E. granulosus in the livestock of the two studied regions; Azerbaijan from Iran and Van from Turkey. Only one case of G3 strain and 3 cases of G1/G3 strains were found in this study.
In general, E. granulosus sensu stricto (G1-G3) are the predominant strains in CE cases throughout the world (7,8). Findings of the current study are in accordance with other reports from Iran, Turkey, and also the Middle East countries. In some studies, conducted in different geographical areas of Iran, the G1 strain of E. granulosus was reported as the dominance genotype in intermediate hosts including cattle, sheep, human and camels (37,38). In one study conducted in Golestan province, northern Iran, G1 and G3 strains have been reported in 78.3% and 15% of CE cases respectively (39). The G1 strain also reported from the wild boar in Iran (14). This further emphasizes that the dominant strain of E. granulosus in Iran, not only in livestock but also in wild animals is the G1-G3 strains. In a study by Simsek et al. (20) on cattle and sheep isolates of E. granulosus metacestodes from eastern areas of Turkey, all of the 54 examined samples were found as G1-G3 strains. A study on the genetic characteristics of human and animals isolates of E. granulosus in the province of Edirne from Turkey, DNA sequencing of the cox1 and nad1 genes was performed and authors indicated that the sheep strain G1 was the most common genotype of E. granulosus affecting humans, sheep and cattle in the studied area. Moreover, 8 haplotypes of Echinococcus species were identified in the region (17). In another similar study for the molecular analysis of E. granulosus isolates from different regions of Turkey, the cox1 gene was used for identification and molecular analysis of CE cases where all of the human hydatid cysts were belonged to the G1 (40). In 2008, Vural et al. (41) reported G1 strain of E. granulosus in 107 out of 112 samples whereas only 5 cases were determined as the G3 strain. The interesting point was that the parasites of the G3 genotype were identified only in the isolates derived from animals in the eastern regions of the country (41). This finding is fully consistent with our findings; where one of our samples derived from Van city (the eastern region in Turkey) was determined as the G3 strain and the rest of the isolates were identified as the G1 strain.
It seems obvious that two regions evaluated in the present study have very close similarity in genetic features of E. granulosus as there were no differences in terms of genotypes and also the diversity of isolates of the parasite in these two areas. Moreover, the isolates of both sheep and cattle from both countries were placed in the same cluster. It should be noted that only cox1 gene was used for genotype analysis of Turkish isolates in this study and this should be considered as a limitation of the current study.
Findings of the current study revealed that the sheep strain G1 is the dominant strain of E. granulosus in livestock isolates in Turkey and Iran. The inter and intra heterogeneity of the isolates in the two countries were 0.0-0.6% and 0.0-1.4% for cox1 and nad1 genomes, respectively.
Findings of the study can be used for adopting the common policies and bilateral cooperation for prevention and also controlling the disease in these two countries. Further studies are needed to determine the dominant genotypes of E. granulosus in human cases in these two regions.
Ethics Committee Approval: The study was approved by the Research Ethics Committee of Shiraz University of Medical Sciences (SUMS, Iran).
Informed Consent: Patient consent was not obtained.
Peer-review: Internally peer-reviewed.
* Authorship Contributions
Concept: A.B., B.S., G.S., Design: A.B., B.S., G.S., A.A., Data Collection or Processing: A.B., G.S., A.A., A.E., M.H., F.M., S.E., Analysis or Interpretation: A.B., B.S., F.M., Literature Search: A.B., B.S., F.M., Writing: A.B., B.S.
Conflict of Interest: No conflict of interest was declared by the authors.
Financial Disclosure: This study financially supported by the Vice-chancellor of Research of Shiraz University of Medical Sciences (Grant No. 95-01-106-13401).
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(iD) Afshin Barazesh (1), (iD) Bahador Sarkari (2,3), (iD) Galip Sarisu (4), (iD) Mehdi Hami (5), (iD) Fattaneh Mikaeili (2), (iD) Abdulalim Aydin (6), (iD) Abdurrahman Ekici (7), (iD) Sepideh Ebrahimi (2)
(1) Bushehr University of Medical Sciences, Faculty of Medicine, Department of Microbiology and Parasitology, Bushehr, Iran
(2) Shiraz University of Medical Sciences Faculty of Medicine, Department of Parasitology and Mycology, Shiraz, Iran
(3) Basic Sciences in Infectious Diseases Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
(4) Mus Alparslan University, Vocational School of Health Services, Mus, Turkey
(5) Iran Veterinary Organization, Technical Deputy of East-Azarbaijan Province, Veterinary Directorate, Iran
(6) Hakkari University, Colemerik Vocational School, Hakkari, Turkey
(7) Van Yuzuncu Yil University Faculty of Medicine, Department of Parasitology, Van, Turkey
Cite this article as: Barazesh A, Sarkari B, Sarisu G, Hami M, Mikaeli F, Aydin A, Ekici A, Ebrahimi S. Comparative Genotyping of Echinococcus granulosus Infecting Livestock in Turkey and Iran. Turkiye Parazitol Derg 2019;43(3): 123-9.
Received/Gelis Tarihi: 09.06.2019 Accepted/Kabul Tarihi: 11.06.2019
Address for Correspondence/Yazar Adresi: Bahador Sarkari, 2Shiraz University of Medical Sciences Faculty of Medicine, Department of Parasitology and Mycology, Shiraz, Iran
Phone/Tel: +90 987132305291 E-mail/E-Posta: email@example.com ORCID ID: orcid.org/0000-0003-2045-9057
Table 1. The specific primers for amplification of cox1 and nad1 fragments Genome Primers Sequences cox1 JB3 (F) 5'-TTT TTT GGG CAT CCT GAG GTT TAT-3' JB4.5 (R) 5'-TAA AGA AAG AAC ATA ATG AAA ATG-3' nad1 JB11 (F) 5'-AGATTCGTAAGGGGCCTAATA-3' JB12 (R) 5'-ACCACTAACTAATTCACTTTC-3' Table 2. Host origin of Echinococcus granulosus isolates from Turkey and Iran livestock and accession numbers deposited in GenBank, using cox1 and nad1 genomes Sample Code Host Origin Accession Accession no. no. (cox1) no. (nad1) 1 1SI Sheep Iran MH542362 MH557949 2 2SI Sheep Iran MH542363 MH557965 3 3SI Sheep Iran MH542364 MH557950 4 4SI Sheep Iran MH542365 MH557951 5 5SI Sheep Iran MH542366 MH557966 6 6SI Sheep Iran MH542367 MH557967 7 7SI Sheep Iran MH542368 MH557952 8 8SI Sheep Iran MH542369 MH557968 9 9SI Sheep Iran MH542370 MH557969 10 10SI Sheep Iran MH542371 MH557953 11 11SI Sheep Iran MH542372 MH557954 12 12SI Sheep Iran MH542373 MH557970 13 13SI Sheep Iran MH542374 MH557971 14 14SI Sheep Iran MH542375 MH557955 15 15SI Sheep Iran MH542376 - 16 16CI Cattle Iran MH542377 MH557972 17 17CI Cattle Iran MH542378 MH557956 18 18CI Cattle Iran MH542379 MH557973 19 19CI Cattle Iran MH542380 MH557957 20 20CI Cattle Iran MH542381 MH557958 21 21CI Cattle Iran MH542382 - 22 22CI Cattle Iran MH542383 MH557959 23 23CI Cattle Iran MH542384 MH557960 24 24CI Cattle Iran MH542385 - 25 25CI Cattle Iran MH542386 MH557961 26 26CI Cattle Iran MH542387 - 27 27CI Cattle Iran MH542388 - 28 28CI Cattle Iran MH542389 MH557962 29 29CI Cattle Iran MH542390 MH557963 30 30CI Cattle Iran MH542391 MH557964 31 1ST Sheep Turkey MH542392 - 32 2ST Sheep Turkey MH542393 - 33 3ST Sheep Turkey MH542394 - 34 4ST Sheep Turkey MH542395 --- 35 5ST Sheep Turkey MH542396 --- 36 6ST Sheep Turkey MH542397 --- 37 7ST Sheep Turkey MH542398 --- 38 8ST Sheep Turkey MH542399 --- 39 9ST Sheep Turkey MH542400 --- 40 10ST Sheep Turkey MH542401 --- 41 11CT Cattle Turkey MH542402 --- 42 12CT Cattle Turkey MH542403 --- 43 14CT Cattle Turkey MH542404 --- 44 15CT Cattle Turkey MH542405 --- 45 16CT Cattle Turkey MH542406 --- 46 17CT Cattle Turkey MH542407 --- 47 18CT Cattle Turkey MH542408 --- 48 19CT Cattle Turkey MH542409 --- 49 20CT Cattle Turkey MH542410 --- Table 3. Echinococcus granulosus haplotypes and genotypes detected in this study using cox1 and nad1 sequences Origin/Host Haplotypes Number Iran Turkey Genotype Homologous to Sheep Cattle Sheep Cattle 1 44 15 14 8 7 G1 MF544127 2 1 - 1 - - G1 MG672258 3 1 - - - 1 G3 MG6822536 4 2 - - 1 1 G1/G3 - 5 1 - - 1 - G1/G3 KX020349
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|Title Annotation:||Original Investigation/Ozgun Arastirma|
|Author:||Barazesh, Afshin; Sarkari, Bahador; Sarisu, Galip; Hami, Mehdi; Mikaeili, Fattaneh; Aydin, Abdulalim|
|Publication:||Turkish Journal of Parasitology|
|Date:||Sep 1, 2019|
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