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Li Y, Huang X, Qing L, Zeng W, Zeng X, Meng F, Wang G, Chen Y. Geographical origin of Plasmodium vivax in the Hainan Island, China: insights from mitochondrial genome. Malar J 2023; 22:84. [PMID: 36890523 PMCID: PMC9993381 DOI: 10.1186/s12936-023-04520-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 02/28/2023] [Indexed: 03/10/2023] Open
Abstract
BACKGROUND Hainan Province, China, has been an endemic region with high transmission of Plasmodium falciparum and Plasmodium vivax. Indigenous malaria caused by P. vivax was eliminated in Hainan in 2011, while imported vivax malaria remains. However, the geographical origin of P. vivax cases in Hainan remains unclear. METHODS Indigenous and imported P. vivax isolates (n = 45) were collected from Hainan Province, and the 6 kb mitochondrial genome was obtained. Nucleotide (π) and haplotype (h) diversity were estimated using DnaSP. The numbers of synonymous nucleotide substitutions per synonymous site (dS) and nonsynonymous nucleotide substitutions per nonsynonymous site (dN) were calculated using the SNAP program. Arlequin software was used to estimate the genetic diversity index and assess population differentiation. Bayesian phylogenetic analysis of P. vivax was performed using MrBayes. A haplotype network was generated using the NETWORK program. RESULTS In total, 983 complete mitochondrial genome sequences were collected, including 45 from this study and 938 publicly available from the NCBI. Thirty-three SNPs were identified, and 18 haplotypes were defined. The haplotype (0.834) and nucleotide (0.00061) diversity in the Hainan populations were higher than China's Anhui and Guizhou population, and the majority of pairwise FST values in Hainan exceeded 0.25, suggesting strong differentiation among most populations except in Southeast Asia. Most Hainan haplotypes were connected to South/East Asian and China's others haplotypes, but less connected with populations from China's Anhui and Guizhou provinces. Mitochondrial lineages of Hainan P. vivax belonged to clade 1 of four well-supported clades in a phylogenetic tree, most haplotypes of indigenous cases formed a subclade of clade 1, and the origin of seven imported cases (50%) could be inferred from the phylogenetic tree, but five imported cases (42.8%) could not be traced using the phylogenetic tree alone, necessitating epidemiological investigation. CONCLUSIONS Indigenous cases in Hainan display high genetic (haplotype and nucleotide) diversity. Haplotype network analysis also revealed most haplotypes in Hainan were connected to the Southeast Asian populations and divergence to a cluster of China's other populations. According to the mtDNA phylogenetic tree, some haplotypes were shared between geographic populations, and some haplotypes have formed lineages. Multiple tests are needed to further explore the origin and expansion of P. vivax populations.
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Affiliation(s)
- Yuchun Li
- Hainan Provincial Centre for Disease Control and Prevention, Haikou, 570203, China.
| | - Xiaomin Huang
- Hainan Provincial Centre for Disease Control and Prevention, Haikou, 570203, China
| | - Ling Qing
- Hainan Provincial Centre for Disease Control and Prevention, Haikou, 570203, China
| | - Wen Zeng
- Hainan Provincial Centre for Disease Control and Prevention, Haikou, 570203, China
| | - Xiangjie Zeng
- Hainan Provincial Centre for Disease Control and Prevention, Haikou, 570203, China
| | - Feng Meng
- Hainan Provincial Centre for Disease Control and Prevention, Haikou, 570203, China
| | - GuangZe Wang
- Hainan Provincial Centre for Disease Control and Prevention, Haikou, 570203, China.
| | - Yan Chen
- Hainan Provincial Centre for Disease Control and Prevention, Haikou, 570203, China.
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Noviyanti R, Miotto O, Barry A, Marfurt J, Siegel S, Thuy-Nhien N, Quang HH, Anggraeni ND, Laihad F, Liu Y, Sumiwi ME, Trimarsanto H, Coutrier F, Fadila N, Ghanchi N, Johora FT, Puspitasari AM, Tavul L, Trianty L, Utami RAS, Wang D, Wangchuck K, Price RN, Auburn S. Implementing parasite genotyping into national surveillance frameworks: feedback from control programmes and researchers in the Asia-Pacific region. Malar J 2020; 19:271. [PMID: 32718342 PMCID: PMC7385952 DOI: 10.1186/s12936-020-03330-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 07/09/2020] [Indexed: 01/13/2023] Open
Abstract
The Asia-Pacific region faces formidable challenges in achieving malaria elimination by the proposed target in 2030. Molecular surveillance of Plasmodium parasites can provide important information on malaria transmission and adaptation, which can inform national malaria control programmes (NMCPs) in decision-making processes. In November 2019 a parasite genotyping workshop was held in Jakarta, Indonesia, to review molecular approaches for parasite surveillance and explore ways in which these tools can be integrated into public health systems and inform policy. The meeting was attended by 70 participants from 8 malaria-endemic countries and partners of the Asia Pacific Malaria Elimination Network. The participants acknowledged the utility of multiple use cases for parasite genotyping including: quantifying the prevalence of drug resistant parasites, predicting risks of treatment failure, identifying major routes and reservoirs of infection, monitoring imported malaria and its contribution to local transmission, characterizing the origins and dynamics of malaria outbreaks, and estimating the frequency of Plasmodium vivax relapses. However, the priority of each use case varies with different endemic settings. Although a one-size-fits-all approach to molecular surveillance is unlikely to be applicable across the Asia-Pacific region, consensus on the spectrum of added-value activities will help support data sharing across national boundaries. Knowledge exchange is needed to establish local expertise in different laboratory-based methodologies and bioinformatics processes. Collaborative research involving local and international teams will help maximize the impact of analytical outputs on the operational needs of NMCPs. Research is also needed to explore the cost-effectiveness of genetic epidemiology for different use cases to help to leverage funding for wide-scale implementation. Engagement between NMCPs and local researchers will be critical throughout this process.
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Affiliation(s)
| | - Olivo Miotto
- Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand
- Wellcome Sanger Institute, Hinxton, Cambridge, UK
- Centre for Genomics and Global Health, Big Data Institute, University of Oxford, Oxford, UK
| | - Alyssa Barry
- School of Medicine, Deakin University, Geelong, VIC, Australia
- Burnet Institute, Melbourne, VIC, Australia
- Population Health and Immunity Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, VIC, Australia
| | - Jutta Marfurt
- Global and Tropical Health Division, Menzies School of Health Research and Charles Darwin University, Darwin, NT, Australia
| | - Sasha Siegel
- Wellcome Sanger Institute, Hinxton, Cambridge, UK
- Global and Tropical Health Division, Menzies School of Health Research and Charles Darwin University, Darwin, NT, Australia
| | - Nguyen Thuy-Nhien
- Centre for Tropical Medicine, Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam
| | - Huynh Hong Quang
- Institute of Malariology, Parasitology and Entomology, Quy Nhon, Vietnam
| | | | | | - Yaobao Liu
- National Health Commission Key Laboratory of Parasitic Disease Control and Prevention, Jiangsu Provincial Key Laboratory on Parasite and Vector Control Technology, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu Province, China
| | | | | | - Farah Coutrier
- Eijkman Institute for Molecular Biology, Jakarta, Indonesia
| | - Nadia Fadila
- Eijkman Institute for Molecular Biology, Jakarta, Indonesia
| | - Najia Ghanchi
- Pathology, Aga Khan University Hospital, Karachi, Pakistan
| | - Fatema Tuj Johora
- Infectious Diseases Division, International Centre for Diarrheal Diseases Research, Bangladesh Mohakhali, Dhaka, Bangladesh
| | | | - Livingstone Tavul
- Papua New Guinea Institute of Medical Research, Madang, Papua New Guinea
| | - Leily Trianty
- Eijkman Institute for Molecular Biology, Jakarta, Indonesia
| | | | - Duoquan Wang
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai, China
| | - Kesang Wangchuck
- Royal Center for Disease Control, Department of Public Health, Ministry of Health, Thimphu, Bhutan
| | - Ric N Price
- Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand
- Global and Tropical Health Division, Menzies School of Health Research and Charles Darwin University, Darwin, NT, Australia
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Sarah Auburn
- Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand.
- Global and Tropical Health Division, Menzies School of Health Research and Charles Darwin University, Darwin, NT, Australia.
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK.
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Rodrigues PT, Alves JMP, Santamaria AM, Calzada JE, Xayavong M, Parise M, da Silva AJ, Ferreira MU. Using mitochondrial genome sequences to track the origin of imported Plasmodium vivax infections diagnosed in the United States. Am J Trop Med Hyg 2014; 90:1102-8. [PMID: 24639297 DOI: 10.4269/ajtmh.13-0588] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Although the geographic origin of malaria cases imported into the United States can often be inferred from travel histories, these histories may be lacking or incomplete. We hypothesized that mitochondrial haplotypes could provide region-specific molecular barcodes for tracing the origin of imported Plasmodium vivax infections. An analysis of 348 mitochondrial genomes from worldwide parasites and new sequences from 69 imported malaria cases diagnosed across the United States allowed for a geographic assignment of most infections originating from the Americas, southeast Asia, east Asia, and Melanesia. However, mitochondrial lineages from Africa, south Asia, central Asia, and the Middle East, which altogether contribute the vast majority of imported malaria cases in the United States, were closely related to each other and could not be reliably assigned to their geographic origins. More mitochondrial genomes are required to characterize molecular barcodes of P. vivax from these regions.
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Affiliation(s)
- Priscila T Rodrigues
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil; Department of Parasitology, Gorgas Memorial Institute of Health, Panama City, Panama; Center for Global Health, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - João Marcelo P Alves
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil; Department of Parasitology, Gorgas Memorial Institute of Health, Panama City, Panama; Center for Global Health, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Ana María Santamaria
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil; Department of Parasitology, Gorgas Memorial Institute of Health, Panama City, Panama; Center for Global Health, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - José E Calzada
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil; Department of Parasitology, Gorgas Memorial Institute of Health, Panama City, Panama; Center for Global Health, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Maniphet Xayavong
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil; Department of Parasitology, Gorgas Memorial Institute of Health, Panama City, Panama; Center for Global Health, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Monica Parise
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil; Department of Parasitology, Gorgas Memorial Institute of Health, Panama City, Panama; Center for Global Health, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Alexandre J da Silva
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil; Department of Parasitology, Gorgas Memorial Institute of Health, Panama City, Panama; Center for Global Health, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Marcelo U Ferreira
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil; Department of Parasitology, Gorgas Memorial Institute of Health, Panama City, Panama; Center for Global Health, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
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Han ET, Wang Y, Lim CS, Cho JH, Chai JY. Genetic diversity of the malaria vaccine candidate merozoite surface protein 1 gene of Plasmodium vivax field isolates in Republic of Korea. Parasitol Res 2011; 109:1571-6. [PMID: 21556687 DOI: 10.1007/s00436-011-2413-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Accepted: 04/14/2011] [Indexed: 10/18/2022]
Abstract
The Plasmodium vivax merozoite surface protein 1 (Pvmsp-1) locus codes for a major asexual blood-stage antigen currently proposed as a malaria vaccine candidate antigen. However, extensive polymorphism of this protein has been observed in isolates from different geographical areas. Here, we investigate the extent and the frequency of allelic diversity at the Pvmsp-1 locus in field isolates collected in the Republic of Korea during the past decade. Among the 45 Korean isolates, six Pvmsp-1 gene types (SKOR-I to SKOR-VI) were identified as unique combinations of type sequences in each variable block. Of these six different Pvmsp-1 gene types, two major Pvmsp-1 allelic types were found in 72% (SKOR-I) and 28% (SKOR-II) of field isolates collected in 1996 to 2000, and four different allelic types (SKOR-III to SKOR-VI) emerged in 70% (10-25%) of isolates collected in 2007 to 2009. These results suggest that allelic diversity of Pvmsp-1 increased in several variable regions, including the N- and C-terminals, after reemergence of P. vivax parasites in the Republic of Korea.
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Affiliation(s)
- Eun-Taek Han
- Department of Parasitology, Kangwon National University School of Medicine, Hyoja2-dong, Chuncheon, Gangwon-do 200-701, Republic of Korea.
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Gunawardena S, Karunaweera ND, Ferreira MU, Phone-Kyaw M, Pollack RJ, Alifrangis M, Rajakaruna RS, Konradsen F, Amerasinghe PH, Schousboe ML, Galappaththy GNL, Abeyasinghe RR, Hartl DL, Wirth DF. Geographic structure of Plasmodium vivax: microsatellite analysis of parasite populations from Sri Lanka, Myanmar, and Ethiopia. Am J Trop Med Hyg 2010; 82:235-42. [PMID: 20133999 DOI: 10.4269/ajtmh.2010.09-0588] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Genetic diversity and population structure of Plasmodium vivax parasites can predict the origin and spread of novel variants within a population enabling population specific malaria control measures. We analyzed the genetic diversity and population structure of 425 P. vivax isolates from Sri Lanka, Myanmar, and Ethiopia using 12 trinucleotide and tetranucleotide microsatellite markers. All three parasite populations were highly polymorphic with 3-44 alleles per locus. Approximately 65% were multiple-clone infections. Mean genetic diversity (H(E)) was 0.7517 in Ethiopia, 0.8450 in Myanmar, and 0.8610 in Sri Lanka. Significant linkage disequilibrium was maintained. Population structure showed two clusters (Asian and African) according to geography and ancestry. Strong clustering of outbreak isolates from Sri Lanka and Ethiopia was observed. Predictive power of ancestry using two-thirds of the isolates as a model identified 78.2% of isolates accurately as being African or Asian. Microsatellite analysis is a useful tool for mapping short-term outbreaks of malaria and for predicting ancestry.
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Affiliation(s)
- Sharmini Gunawardena
- Department of Immunology and Infectious Diseases, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115, USA
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Véron V, Legrand E, Yrinesi J, Volney B, Simon S, Carme B. Genetic diversity of msp3alpha and msp1_b5 markers of Plasmodium vivax in French Guiana. Malar J 2009; 8:40. [PMID: 19284592 PMCID: PMC2660359 DOI: 10.1186/1475-2875-8-40] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2008] [Accepted: 03/11/2009] [Indexed: 11/16/2022] Open
Abstract
Background Reliable molecular typing tools are required for a better understanding of the molecular epidemiology of Plasmodium vivax. The genes msp3a and msp1_block5 are highly polymorphic and have been used as markers in many P. vivax population studies. These markers were used to assess the genetic diversity of P. vivax strains from French Guiana (South America) and to develop a molecular typing protocol. Methods A total of 120 blood samples from 109 patients (including 10 patients suffered from more than one malaria episode, samples were collected during each episode) with P. vivax infection were genotyped. All samples were analysed by msp3a PCR-RFLP and msp1_b5 gene sequencing was performed on 57 samples. Genotyping protocol applied to distinguish between new infection or relapse from heterologus hypnozoites and treatment failure or relapse from homologus hypnozoites was based on analysing first msp3a by PCR-RFLP and secondly, only if the genotypes of the two samples are identical, on sequencing the msp1_b5 gene. Results msp3a alleles of three sizes were amplified by PCR: types A, B and C. Eleven different genotypes were identified among the 109 samples analysed by msp3a PCR-RFLP. In 13.8% of cases, a mixed genotype infection was observed. The sequence of msp1_b5 gene revealed 22 unique genotypes and 12.3% of cases with mixed infection. In the 57 samples analysed by both methods, 45 genotypes were found and 21% were mixed. Among ten patients with two or three malaria episodes, the protocol allowed to identify five new infections or relapses from heterologous hypnozoites and six treatment failures of relapses from homologous hypnozoites. Conclusion The study showed a high diversity of msp3a and msp1_b5 genetic markers among P. vivax strains in French Guiana with a low polyclonal infection rate. These results indicated that the P. vivax genotyping protocol presented has a good discrimination power and can be used in clinical drug trials or epidemiological studies.
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Affiliation(s)
- Vincent Véron
- Laboratoire Hospitalo-Universitaire de Parasitologie et Mycologie Médicale, Equipe EA3593, UFR de Médecine de l'Université des Antilles et de la Guyane, Cayenne, French Guiana.
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Karunaweera ND, Ferreira MU, Munasinghe A, Barnwell JW, Collins WE, King CL, Kawamoto F, Hartl DL, Wirth DF. Extensive microsatellite diversity in the human malaria parasite Plasmodium vivax. Gene 2008; 410:105-12. [DOI: 10.1016/j.gene.2007.11.022] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2007] [Revised: 11/30/2007] [Accepted: 11/30/2007] [Indexed: 10/22/2022]
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Leclerc MC, Gauthier C, Villegas L, Urdaneta L. Genetic diversity of merozoite surface protein-1 gene of Plasmodium vivax isolates in mining villages of Venezuela (Bolivar State). Acta Trop 2005; 95:26-32. [PMID: 15862584 DOI: 10.1016/j.actatropica.2005.03.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2004] [Revised: 02/07/2005] [Accepted: 03/08/2005] [Indexed: 11/21/2022]
Abstract
The merozoite surface protein-1 gene of Plasmodium vivax is highly polymorphic and so, currently used in epidemiological studies of P. vivax malaria. We sequenced the variable block 5 of the gene from 39 Venezuelan isolates, 18 of which were co-infected with Plasmodium falciparum. We observed a limited variability with 34 isolates belonging to the type Salvador I, none Belem type and only five recombinants. Among the recombinants, only two types of sequences were observed with, respectively, 18 and 21 poly-Q residues. Nucleotide substitutions explained the major differences of the 11 patterns observed. We could evidence neither specific MSP-1 genotype associated with co-infected samples, nor peculiar MSP-1 genotype distribution inside the investigated areas. In comparison with other low endemic regions in the world, our sampling has a lower genetic diversity, which could be mainly explained by the lack of Belem type. In fact, the variable repeats of poly-Q residues involved in the polymorphism of Belem type and recombinant isolates are responsible for a great part of variability observed in MSP-1 block 5.
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Affiliation(s)
- Marie Claude Leclerc
- Laboratoire de Génétique et Evolution des Maladies Infectieuses, UMR CNRS/IRD 2774, 911 Avenue Agropolis, BP 64501, 34394 Montpellier Cedex 5, France.
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Affiliation(s)
- Dominique Labie
- Inserm U.567, Institut Cochin, 24, rue du Faubourg Saint-Jacques, 75014 Paris, France.
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Severini C, Menegon M, Di Luca M, Abdullaev I, Majori G, Razakov SA, Gradoni L. Risk of Plasmodium vivax malaria reintroduction in Uzbekistan: genetic characterization of parasites and status of potential malaria vectors in the Surkhandarya region. Trans R Soc Trop Med Hyg 2004; 98:585-92. [PMID: 15289095 DOI: 10.1016/j.trstmh.2004.01.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2003] [Revised: 01/05/2004] [Accepted: 01/12/2004] [Indexed: 11/21/2022] Open
Abstract
Plasmodium vivax malaria was eradicated from Uzbekistan in 1961. Due to resurgence of the disease in neighbouring states and massive population migration, there has been an increase of P. vivax malaria, imported from Tajikistan, resulting in a number of indigenous cases being identified in areas bordering that country. A molecular study using the merozoite surface protein 1 (msp-1) gene as a marker was performed on 24 P. vivax genomic isolates from 12 indigenous and 10 imported malaria cases that occurred in the Surkhandarya region during the summer of 2002. Results have shown a significant difference in the frequency of msp-1 types between indigenous and imported isolates, the latter showing greater genetic heterogeneity. An entomological investigation in the area suggested that three Anopheles species, namely A. superpictus, A. pulcherrimus and A. hyrcanus may have a potential role in the endemic transmission of P. vivax.
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Affiliation(s)
- Carlo Severini
- Laboratorio di Parassitologia, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy
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Leclerc MC, Menegon M, Cligny A, Noyer JL, Mammadov S, Aliyev N, Gasimov E, Majori G, Severini C. Genetic diversity of Plasmodium vivax isolates from Azerbaijan. Malar J 2004; 3:40. [PMID: 15535878 PMCID: PMC534801 DOI: 10.1186/1475-2875-3-40] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2004] [Accepted: 11/09/2004] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Plasmodium vivax, although causing a less serious disease than Plasmodium falciparum, is the most widespread of the four human malarial species. Further to the recent recrudescence of P. vivax cases in the Newly Independent States (NIS) of central Asia, a survey on the genetic diversity and dissemination in Azerbaijan was undertaken. Azerbaijan is at the crossroads of Asia and, as such, could see a rise in the number of cases, although an effective malaria control programme has been established in the country. METHODS Thirty-six P. vivax isolates from Central Azerbaijan were characterized by analysing the genetic polymorphism of the circumsporozoite protein (CSP) and the merozoite surface protein 1 (MSP-1) genes, using PCR amplifications and amplicons sequencing. RESULTS Analysis of CSP sequences showed that all the processed isolates belong to the VK 210 type, with variations in the alternation of alanine residue (A) or aspartic acid residue (D) in the repeat motif GDRA(A/D)GQPA along the sequence. As far as MSP-1 genotyping is concerned, it was found that the majority of isolates analysed belong to Belem and Sal I types. Five recombinant isolates were also identified. Combined analysis with the two genetic markers allowed the identification of 19 plasmodial sub-types. CONCLUSION The results obtained in the present study indicate that there are several P. vivax clones circulating in Azerbaijan and, consequently, a careful malaria surveillance could be of paramount importance to identify, at early stage, the occurrence of possible P. vivax malaria outbreaks.
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Affiliation(s)
- Marie Claude Leclerc
- UR IRD 165, Génétique et Evolution des Maladies Infectieuses, UMR CNRS/IRD 2724, 911 Avenue Agropolis, BP 64501, 34394 Montpellier cedex 5, France
| | - Michela Menegon
- Department of Infectious, Parasitic and Immunomediated Diseases, Instituto Superiore di Sanità, Viale Regina Elena 299, Rome, Italy
| | - Alexandra Cligny
- UR IRD 165, Génétique et Evolution des Maladies Infectieuses, UMR CNRS/IRD 2724, 911 Avenue Agropolis, BP 64501, 34394 Montpellier cedex 5, France
| | - Jean Louis Noyer
- CIRAD UMR 1096/PIA, TA40/03, Avenue Agropolis, F-34398 Montpellier, France
| | - Suleyman Mammadov
- Parasitology Department, Republican Center of Hygiene and Epidemiology, Baku, Azerbaijan
| | - Namig Aliyev
- National Research Institute of Medical Prevention, Baku
| | | | - Giancarlo Majori
- Department of Infectious, Parasitic and Immunomediated Diseases, Instituto Superiore di Sanità, Viale Regina Elena 299, Rome, Italy
| | - Carlo Severini
- Department of Infectious, Parasitic and Immunomediated Diseases, Instituto Superiore di Sanità, Viale Regina Elena 299, Rome, Italy
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