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Ramos LG, de Souza KR, Júnior PAS, Câmara CC, Castelo-Branco FS, Boechat N, Carvalho SA. Tackling the challenges of human Chagas disease: A comprehensive review of treatment strategies in the chronic phase and emerging therapeutic approaches. Acta Trop 2024; 256:107264. [PMID: 38806090 DOI: 10.1016/j.actatropica.2024.107264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 05/15/2024] [Accepted: 05/17/2024] [Indexed: 05/30/2024]
Abstract
Chagas disease (CD), caused by the flagellated protozoan Trypanosoma cruzi (T. cruzi), affects approximately 7 million people worldwide and is endemic in Latin America, especially among socioeconomically disadvantaged populations. Since the 1960s, only two drugs have been commercially available for treating this illness: nifurtimox (NFX) and benznidazole (BZN). Although these drugs are effective in the acute phase (AP) of the disease, in which parasitemia is usually high, their cure rates in the chronic phase (CP) are low and often associated with several side effects. The CP is characterized by a subpatent parasitaemia and absence of clinical symptoms in the great majority of infected individuals. However, at least 30 % of the individuals will develop potentially lethal symptomatic forms, including cardiac and digestive manifestations. For such reason, in the CP the treatment is usually symptomatic and typically focuses on managing complications such as arrhythmias, heart failure, or digestive problems. Therefore, the need for new drugs or therapeutic approaches using BZN or NFX is extremely urgent. This review presents the main clinical trials, especially in the CP, which involve BZN and NFX in different treatment regimens. Additionally, other therapies using combinations of these drugs with other substances such as allopurinol, itraconazole, ravuconazole, ketoconazole, posaconazole and amiodarone are also reported. The importance of early diagnosis, especially in pediatric patients, is also discussed, emphasizing the need to identify the disease in its early stages to improve the chances of successful treatment.
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Affiliation(s)
- Laís Gomes Ramos
- Laboratorio de Sintese de Farmacos -LASFAR, Instituto de Tecnologia em Farmacos - Farmanguinhos, Fundação Oswaldo Cruz, Rio de Janeiro, RJ 21041-250, Brazil; Laboratório de Físico-Química de Materiais, Seção de Engenharia Química, Instituto Militar de Engenharia, Praça General Tibúrcio 80, Rio de Janeiro, RJ 22290-270, Brazil
| | - Kátia Regina de Souza
- Laboratório de Físico-Química de Materiais, Seção de Engenharia Química, Instituto Militar de Engenharia, Praça General Tibúrcio 80, Rio de Janeiro, RJ 22290-270, Brazil
| | - Policarpo Ademar Sales Júnior
- Laboratório de Imunopatologia e Biologia Molecular, Departamento de Imunologia, Instituto Ageu Magalhães, Fundação Oswaldo Cruz, Recife, PE 50670-420, Brazil
| | - Camila Capelini Câmara
- Laboratorio de Sintese de Farmacos -LASFAR, Instituto de Tecnologia em Farmacos - Farmanguinhos, Fundação Oswaldo Cruz, Rio de Janeiro, RJ 21041-250, Brazil; Laboratório de Físico-Química de Materiais, Seção de Engenharia Química, Instituto Militar de Engenharia, Praça General Tibúrcio 80, Rio de Janeiro, RJ 22290-270, Brazil
| | - Frederico S Castelo-Branco
- Laboratorio de Sintese de Farmacos -LASFAR, Instituto de Tecnologia em Farmacos - Farmanguinhos, Fundação Oswaldo Cruz, Rio de Janeiro, RJ 21041-250, Brazil
| | - Nubia Boechat
- Laboratorio de Sintese de Farmacos -LASFAR, Instituto de Tecnologia em Farmacos - Farmanguinhos, Fundação Oswaldo Cruz, Rio de Janeiro, RJ 21041-250, Brazil
| | - Samir Aquino Carvalho
- Laboratorio de Sintese de Farmacos -LASFAR, Instituto de Tecnologia em Farmacos - Farmanguinhos, Fundação Oswaldo Cruz, Rio de Janeiro, RJ 21041-250, Brazil.
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López R, García A, Chura Aruni JJ, Balboa V, Rodríguez A, Erkosar B, Kamoun A, Rodriguez M, Fortun E, Bohorquez LC. Comparative evaluation of lateral flow assays to diagnose chronic Trypanosoma cruzi infection in Bolivia. PLoS Negl Trop Dis 2024; 18:e0012016. [PMID: 38437237 PMCID: PMC10939271 DOI: 10.1371/journal.pntd.0012016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 03/14/2024] [Accepted: 02/20/2024] [Indexed: 03/06/2024] Open
Abstract
Bolivia has the highest incidence of Chagas disease (CD) worldwide. Caused by the parasite Trypanasoma cruzi, CD is generally a chronic condition. Diagnosis is logistically and financially challenging, requiring at least two different laboratory-based serological tests. Many CD cases are missed; in Bolivia it is estimated just 6% of individuals chronically infected with T. cruzi get diagnosed. Achieving control on the way to elimination of CD requires a radical simplification of the current CD testing pathways, to overcome the barriers to accessing CD treatment. We aimed to generate unbiased performance data of lateral flow assays (LFAs) for T. cruzi infection in Bolivia, to evaluate their usefulness for improving T. cruzi diagnosis rates in a precise and efficient manner. This retrospective, laboratory-based, diagnostic evaluation study sought to estimate the sensitivity/specificity of 10 commercially available LFAs for T. cruzi, using the current CD diagnostic algorithm employed in Bolivia as the reference test method. All tests were blinded at the study site and performed by three operators. In total, 470 serum samples were tested, including 221 and 249 characterized as CD-positive/-negative, respectively. The LFAs were scored according to their relative importance using a decision-tree-based algorithm, with the mean decrease in Gini index as the scoring metric. The estimates of sensitivities ranged from 62.2-97.7% (95% confidence interval (CI) lower bound 55.0-94.7%); for specificities the range was 78.6-100% (95% CI lower bound 72.0-97.5%); 5/10 and 6/10 tests had sensitivity >90% and specificity >95%, respectively. Four LFAs showed high values of both sensitivity (93-95%) and specificity (97-99%). The agreement between 6 LFAs and the reference tests was almost perfect (Kappa 0.83-0.94). Most LFAs evaluated thus showed performances comparable with current laboratory-based diagnostic methods.
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Affiliation(s)
- Ronald López
- Instituto Nacional de Laboratorios de Salud (INLASA), La Paz, Bolivia
| | - Andrea García
- Instituto Nacional de Laboratorios de Salud (INLASA), La Paz, Bolivia
| | | | - Victor Balboa
- Instituto Nacional de Laboratorios de Salud (INLASA), La Paz, Bolivia
| | - Andrea Rodríguez
- Instituto Nacional de Laboratorios de Salud (INLASA), La Paz, Bolivia
| | - Berra Erkosar
- FIND, Campus Biotech, Chemin des Mines 9, Geneva, Switzerland
| | - Aurélie Kamoun
- FIND, Campus Biotech, Chemin des Mines 9, Geneva, Switzerland
| | | | - Evelin Fortun
- Instituto Nacional de Laboratorios de Salud (INLASA), La Paz, Bolivia
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Zingales B, Macedo AM. Fifteen Years after the Definition of Trypanosoma cruzi DTUs: What Have We Learned? Life (Basel) 2023; 13:2339. [PMID: 38137940 PMCID: PMC10744745 DOI: 10.3390/life13122339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 12/04/2023] [Accepted: 12/06/2023] [Indexed: 12/24/2023] Open
Abstract
Trypanosoma cruzi, the protozoan causative of Chagas disease (ChD), exhibits striking genetic and phenotypic intraspecific diversity, along with ecoepidemiological complexity. Human-pathogen interactions lead to distinct clinical presentations of ChD. In 2009, an international consensus classified T. cruzi strains into six discrete typing units (DTUs), TcI to TcVI, later including TcBat, and proposed reproducible genotyping schemes for DTU identification. This article aims to review the impact of classifying T. cruzi strains into DTUs on our understanding of biological, ecoepidemiological, and pathogenic aspects of T. cruzi. We will explore the likely origin of DTUs and the intrinsic characteristics of each group of strains concerning genome organization, genomics, and susceptibility to drugs used in ChD treatment. We will also provide an overview of the association of DTUs with mammalian reservoirs, and summarize the geographic distribution, and the clinical implications, of prevalent specific DTUs in ChD patients. Throughout this review, we will emphasize the crucial roles of both parasite and human genetics in defining ChD pathogenesis and chemotherapy outcome.
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Affiliation(s)
- Bianca Zingales
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo 05508-900, São Paulo, Brazil
| | - Andréa M. Macedo
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Minas Gerais, Brazil;
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Flores-Chavez MD, Abras A, Ballart C, Ibáñez-Perez I, Perez-Gordillo P, Gállego M, Muñoz C, Moure Z, Sulleiro E, Nieto J, García Diez E, Simón L, Cruz I, Picado A. Parasitemia Levels in Trypanosoma cruzi Infection in Spain, an Area Where the Disease Is Not Endemic: Trends by Different Molecular Approaches. Microbiol Spectr 2022; 10:e0262822. [PMID: 36190410 PMCID: PMC9603785 DOI: 10.1128/spectrum.02628-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Accepted: 09/13/2022] [Indexed: 01/04/2023] Open
Abstract
Trypanosoma cruzi infection has expanded globally through human migration. In Spain, the mother-to-child route is the mode of transmission contributing to autochthonous Chagas disease (CD); however, most people acquired the infection in their country of origin and were diagnosed in the chronic phase (imported chronic CD). In this context, we assessed the quantitative potential of the Loopamp Trypanosoma cruzi detection kit (Sat-TcLAMP) based on satellite DNA (Sat-DNA) to determine parasitemia levels compared to those detected by real-time quantitative PCRs (qPCRs) targeting Sat-DNA (Sat-qPCR) and kinetoplast DNA minicircles (kDNA-qPCR). This study included 173 specimens from 39 autochthonous congenital and 116 imported chronic CD cases diagnosed in Spain. kDNA-qPCR showed higher sensitivity than Sat-qPCR and Sat-TcLAMP. According to all quantitative approaches, parasitemia levels were significantly higher in congenital infection than in chronic CD (1 × 10-1 to 5 × 105 versus >1 × 10-1 to 6 × 103 parasite equivalents/mL, respectively [P < 0.001]). Sat-TcLAMP, Sat-qPCR, and kDNA-qPCR results were equivalent at high levels of parasitemia (P = 0.381). Discrepancies were significant for low levels of parasitemia and older individuals. Differences between Sat-TcLAMP and Sat-qPCR were not qualitatively significant, but estimations of parasitemia using Sat-TcLAMP were closer to those by kDNA-qPCR. Parasitemia changes were assessed in 6 individual cases in follow-up, in which trends showed similar patterns by all quantitative approaches. At high levels of parasitemia, Sat-TcLAMP, Sat-qPCR, and kDNA-qPCR worked similarly, but significant differences were found for the low levels characteristic of late chronic CD. A suitable harmonization strategy needs to be developed for low-level parasitemia detection using Sat-DNA- and kDNA-based tests. IMPORTANCE Currently, molecular equipment has been introduced into many health care centers, even in low-income countries. PCR, qPCR, and loop-mediated isothermal amplification (LAMP) are becoming more accessible for the diagnosis of neglected infectious diseases. Chagas disease (CD) is spreading worldwide, and in countries where the disease is not endemic, such as Spain, the parasite Trypanosoma cruzi is transmitted from mother to child (congenital CD). Here, we explore why LAMP, aimed at detecting T. cruzi parasite DNA, is a reliable option for the diagnosis of congenital CD and the early detection of reactivation in chronic infection. When the parasite load is high, LAMP is equivalent to any qPCR. In addition, the estimations of T. cruzi parasitemia in patients living in Spain, a country where the disease is not endemic, resemble natural evolution in areas of endemicity. If molecular tests are introduced into the diagnostic algorithm for congenital infection, early diagnosis and timely treatment would be accomplished, so the interruption of vertical transmission can be an achievable goal.
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Affiliation(s)
- Maria D. Flores-Chavez
- National Centre for Microbiology, Instituto de Salud Carlos III, Madrid, Spain
- Fundación Mundo Sano-España, Madrid, Spain
| | - Alba Abras
- Departament de Biologia, Universitat de Girona, Girona, Spain
| | - Cristina Ballart
- Secció de Parasitologia, Departament de Biologia, Sanitat i Medi Ambient, Facultat de Farmàcia i Ciències de l’Alimentació, Universitat de Barcelona, Barcelona, Spain
| | - Ismael Ibáñez-Perez
- National Centre for Microbiology, Instituto de Salud Carlos III, Madrid, Spain
| | | | - Montserrat Gállego
- Secció de Parasitologia, Departament de Biologia, Sanitat i Medi Ambient, Facultat de Farmàcia i Ciències de l’Alimentació, Universitat de Barcelona, Barcelona, Spain
- ISGlobal, Barcelona, Hospital Clínic, Universitat de Barcelona, Barcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas, Instituto de Salud Carlos III (CIBERINFEC, ISCIII), Madrid, Spain
| | - Carmen Muñoz
- Servei de Microbiologia, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
- Institut de Recerca Biomèdica Sant Pau, Barcelona, Spain
- Departament de Genètica i Microbiologia, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
| | - Zaira Moure
- Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Santander, Spain
| | - Elena Sulleiro
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas, Instituto de Salud Carlos III (CIBERINFEC, ISCIII), Madrid, Spain
- Microbiology Department, Vall d’Hebron Hospital, PROSICS Barcelona, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Javier Nieto
- National Centre for Microbiology, Instituto de Salud Carlos III, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas, Instituto de Salud Carlos III (CIBERINFEC, ISCIII), Madrid, Spain
| | - Emilia García Diez
- National Centre for Microbiology, Instituto de Salud Carlos III, Madrid, Spain
| | - Lorena Simón
- National Centre of Epidemiology, Instituto de Salud Carlos III, Madrid, Spain
| | - Israel Cruz
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas, Instituto de Salud Carlos III (CIBERINFEC, ISCIII), Madrid, Spain
- National School of Public Health, Instituto de Salud Carlos III, Madrid, Spain
- Foundation for Innovative New Diagnostics (FIND), Geneva, Switzerland
| | - Albert Picado
- Foundation for Innovative New Diagnostics (FIND), Geneva, Switzerland
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Britto CC. Revisiting Chagas' disease diagnostic strategies in light of different scenarios of Trypanosoma cruzi infection. Mem Inst Oswaldo Cruz 2022; 117:e210444chgsb. [PMID: 35613158 PMCID: PMC9164940 DOI: 10.1590/0074-02760210444chgsb] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 12/17/2021] [Indexed: 11/22/2022] Open
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Angheben A. Air in the tires: towards an achievable, efficacious and timely diagnosis for Chagas disease. Mem Inst Oswaldo Cruz 2022; 117:e210444chgsa. [PMID: 35613157 PMCID: PMC9164947 DOI: 10.1590/0074-02760210444chgsa] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 12/17/2021] [Indexed: 11/22/2022] Open
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Worldwide Control and Management of Chagas Disease in a New Era of Globalization: a Close Look at Congenital Trypanosoma cruzi Infection. Clin Microbiol Rev 2022; 35:e0015221. [PMID: 35239422 PMCID: PMC9020358 DOI: 10.1128/cmr.00152-21] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Population movements have turned Chagas disease (CD) into a global public health problem. Despite the successful implementation of subregional initiatives to control vectorial and transfusional Trypanosoma cruzi transmission in Latin American settings where the disease is endemic, congenital CD (cCD) remains a significant challenge. In countries where the disease is not endemic, vertical transmission plays a key role in CD expansion and is the main focus of its control. Although several health organizations provide general protocols for cCD control, its management in each geopolitical region depends on local authorities, which has resulted in a multitude of approaches. The aims of this review are to (i) describe the current global situation in CD management, with emphasis on congenital infection, and (ii) summarize the spectrum of available strategies, both official and unofficial, for cCD prevention and control in countries of endemicity and nonendemicity. From an economic point of view, the early detection and treatment of cCD are cost-effective. However, in countries where the disease is not endemic, national health policies for cCD control are nonexistent, and official regional protocols are scarce and restricted to Europe. Countries of endemicity have more protocols in place, but the implementation of diagnostic methods is hampered by economic constraints. Moreover, most protocols in both countries where the disease is endemic and those where it is not endemic have yet to incorporate recently developed technologies. The wide methodological diversity in cCD diagnostic algorithms reflects the lack of a consensus. This review may represent a first step toward the development of a common strategy, which will require the collaboration of health organizations, governments, and experts in the field.
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Castro-Sesquen YE, Tinajeros F, Bern C, Galdos-Cardenas G, Malaga ES, Valencia Ayala E, Hjerrild K, Clipman SJ, Lescano AG, Bayangos T, Castillo W, Menduiña MC, Talaat KR, Gilman RH. The Immunoglobulin M-Shed Acute Phase Antigen (SAPA)-test for the Early Diagnosis of Congenital Chagas Disease in the Time of the Elimination Goal of Mother-to-Child Transmission. Clin Infect Dis 2021; 73:e477-e484. [PMID: 32667981 DOI: 10.1093/cid/ciaa986] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 07/09/2020] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND Diagnosis of congenital Chagas disease (CChD) in most endemic areas is based on low-sensitive microscopy at birth and 9-month immunoglobulin G (IgG), which has poor adherence. We aim to evaluate the accuracy of the Immunoglobulin M (IgM)-Shed Acute Phase Antigen (SAPA) test in the diagnosis of CChD at birth. METHODS Two cohort studies (training and validation cohorts) were conducted in 3 hospitals in the department of Santa Cruz, Bolivia. Pregnant women were screened for Chagas disease, and all infants born to seropositive mothers were followed for up to 9 months to diagnose CChD. A composite reference standard was used to determine congenital infection and was based on the parallel use of microscopy, quantitative polymerase chain reaction (qPCR), and IgM-trypomastigote excreted-secreted antigen (TESA) blot at birth and/or 1 month, and/or the detection of anti-Trypanosoma cruzi IgG at 6 or 9 months. The diagnostic accuracy of the IgM-SAPA test was calculated at birth against the composite reference standard. RESULTS Adherence to the 6- or 9-month follow-up ranged from 25.3% to 59.7%. Most cases of CChD (training and validation cohort: 76.5% and 83.7%, respectively) were detected during the first month of life using the combination of microscopy, qPCR, and/or IgM-TESA blot. Results from the validation cohort showed that when only 1 infant sample obtained at birth was evaluated, the qPCR and the IgM-SAPA test have similar accuracy (sensitivity: range, 79.1%-97.1% and 76.7%-94.3%, respectively, and specificity: 99.5% and 92.6%, respectively). CONCLUSIONS The IgM-SAPA test has the potential to be implemented as an early diagnostic tool in areas that currently rely only on microscopy.
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Affiliation(s)
- Yagahira E Castro-Sesquen
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Freddy Tinajeros
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.,Asociación Benéfica PRISMA, Lima, Peru
| | - Caryn Bern
- Department of Epidemiology and Biostatistics, University of California, San Francisco School of Medicine, San Francisco, California, USA
| | - Gerson Galdos-Cardenas
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Edith S Malaga
- Infectious Diseases Research Laboratory, School of Science and Philosophy, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Edward Valencia Ayala
- Infectious Diseases Research Laboratory, School of Science and Philosophy, Universidad Peruana Cayetano Heredia, Lima, Peru
| | | | - Steven J Clipman
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Andrés G Lescano
- Emerging Diseases and Climate Change Research Unit, School of Public Health and Administration, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Tabitha Bayangos
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | | | | | - Kawsar R Talaat
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Robert H Gilman
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
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Castro-Sesquen YE, Saldaña A, Patino Nava D, Bayangos T, Paulette Evans D, DeToy K, Trevino A, Marcus R, Bern C, Gilman RH, Talaat KR. Use of a Latent Class Analysis in the Diagnosis of Chronic Chagas Disease in the Washington Metropolitan Area. Clin Infect Dis 2021; 72:e303-e310. [PMID: 32766826 DOI: 10.1093/cid/ciaa1101] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND The diversity of individuals at risk for Trypanosoma cruzi infection in the United States poses challenges for diagnosis. We evaluated the diagnostic accuracy of Food and Drug Administration (FDA)-cleared tests in the Washington Metropolitan area (WMA). METHODS In total, 1514 individuals were evaluated (1078 from Mexico, Central and northern South America [TcI-predominant areas], and 436 from southern South America [TcII/V/VI-predominant areas]). Optical density (OD) values from the Hemagen EIA and Chagatest v.3 Wiener, and categorical results of the IgG-TESA-blot (Western blot with trypomastigote excretory-secretory antigen), and the Chagas detect plus (CDP), as well as information of area of origin were used to determine T. cruzi serostatus using latent class analysis. RESULTS We detected 2 latent class (LC) of seropositives with low (LC1) and high (LC2) antibody levels. A significantly lower number of seropositives were detected by the Wiener, IgG-TESA-blot, and CDP in LC1 (60.6%, P < .001, 93.1%, P = .014, and 84.9%, P = .002, respectively) as compared to LC2 (100%, 100%, and 98.2%, respectively). LC1 was the main type of seropositives in TcI-predominant areas, representing 65.0% of all seropositives as opposed to 22.8% in TcII/V/VI-predominant areas. The highest sensitivity was observed for the Hemagen (100%, 95% confidence interval [CI]: 96.2-100.0), but this test has a low specificity (90.4%, 95% CI: 88.7-91.9). The best balance between positive (90.9%, 95% CI: 83.5-95.1), and negative (99.9%, 95% CI: 99.4-99.9) predictive values was obtained with the Wiener. CONCLUSIONS Deficiencies in current FDA-cleared assays were observed. Low antibody levels are the main type of seropositives in individuals from TcI-predominant areas, the most frequent immigrant group in the United States.
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Affiliation(s)
- Yagahira E Castro-Sesquen
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Antonella Saldaña
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Dhayanna Patino Nava
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Tabitha Bayangos
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Diana Paulette Evans
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Kelly DeToy
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Alexia Trevino
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Rachel Marcus
- MedStar Washington Hospital Center, Washington, D.C., USA
| | - Caryn Bern
- Department of Epidemiology and Biostatistics, School of Medicine, University of California, San Francisco, San Francisco, California, USA
| | - Robert H Gilman
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Kawsar R Talaat
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
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Performance Evaluation of a Commercial Real-Time PCR Assay and of an In-House Real-Time PCR for Trypanosoma cruzi DNA Detection in a Tropical Medicine Reference Center, Northern Italy. Microorganisms 2020; 8:microorganisms8111692. [PMID: 33143253 PMCID: PMC7692395 DOI: 10.3390/microorganisms8111692] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 10/23/2020] [Accepted: 10/28/2020] [Indexed: 02/01/2023] Open
Abstract
Chagas disease, a neglected protozoal disease endemic in Latin America, is also currently considered an emerging threat in nonendemic areas because of population movements. The detection of Trypanosoma cruzi DNA is increasingly being considered as important evidence to support Chagas disease diagnoses. However, further performance evaluation of molecular assays is useful for a standardization of strategy considering the whole process in routine diagnosis, especially for the different settings such as endemic and nonendemic countries. Seventy-five samples were collected from subjects screened for Chagas disease in Italy. The DNA was isolated from blood using automated extraction. We evaluated the performance of the commercial RealCycler® CHAG kit (pmPCR) based on satellite DNA (SatDNA) and of an in-house real-time PCR (ihPCR) targeting Sat and kinetoplast (k) DNAs, using the concordance of two serology assays as a reference standard. The sensitivity of kDNA and SatDNA tests by ihPCR and SatDNA by pmPCR were 14.29% (95% confidence interval (CI) 6.38 to 26.22), 7.14% (95% CI 1.98 to 17.29), and 7.14% (95% CI 1.98 to 17.29), respectively. Specificity was 100% for all PCR assays and targets. Overall, our results suggest that the preferred approach for clinical laboratories is to combine the kDNA and SatDNA as targets in order to minimize false-negative results increasing sensitivity.
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Tavares de Oliveira M, Sulleiro E, Silgado Gimenez A, de Lana M, Zingales B, Santana da Silva J, Marin-Neto JA, Molina I. Quantification of parasite burden of Trypanosoma cruzi and identification of Discrete Typing Units (DTUs) in blood samples of Latin American immigrants residing in Barcelona, Spain. PLoS Negl Trop Dis 2020; 14:e0008311. [PMID: 32497037 PMCID: PMC7271996 DOI: 10.1371/journal.pntd.0008311] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 04/20/2020] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Trypanosoma cruzi has a high genetic and biological diversity and has been subdivided into seven genetic lineages, named TcI-TcVI and TcBat. DTUs TcI-TcII-TcV and TcVI are agents of ChD in different regions of Latin America. Due to population movements, the disease is an emergent global public health problem. Thus, the aim of this study was to quantify the parasitic load and identify the presence of T. cruzi DTUs in 101 Latin American immigrants with chronic ChD, residing in Barcelona, Spain. METHODOLOGY / PRINCIPAL FINDINGS 5ml of peripheral blood were collected in guanidine/EDTA from each patient for DNA extraction, quantification of the parasitic load and genotyping. A great variation of the parasitic load of the patients was verified: from 0.001 to 22.2 T. cruzi DNA (fg) / Blood DNA (ng). In patients from Bolivia the parasitic load was 3.76±4.43 T. cruzi DNA (fg) / Blood DNA (ng) (mean ± SD), in patients of other countries was 0.95±1.38 T. cruzi DNA (fg) / Blood DNA (ng). No statistically significant difference was observed in the parasitic load between patients with the indeterminate and cardiac forms of ChD (p = 0,57). Parasite genotyping was performed by multilocus conventional PCR. In patients from Bolivia there was a nearly equal prevalence of DTUs TcV (27/77), TcII/TcV/TcVI (26/77), and TcII/TcVI (22/77). TcVI was detected in only 2 samples (2/77). A higher prevalence of TcII/TcVI (19/24) was verified in patients of other countries, with low prevalence of TcII/TcV/TcVI (4/24) and TcV (1/24). CONCLUSIONS/SIGNIFICANCE In this study, low/medium parasitic load was found in all patients evaluated. Our data corroborate previous conclusions indicating that patients from the Bolivia, living in Spain, are predominantly infected by TcV, and TcVI DTUs. On the other hand, in Non-Bolivians patients TcII/TcVI predominated. Surprisingly, in our cohort of 101 patients no infection by TcI DTU was observed.
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Affiliation(s)
- Maykon Tavares de Oliveira
- Department of Infectious Diseases, Universitat Autònoma de Barcelona, Vall d’Hebron University Hospital. PROSICS, Barcelona. Spain
- Department of Internal Medicine, Cardiology Division, Medical School of Ribeirão Preto, University of São Paulo (FMRP-USP), Ribeirão Preto, SP, Brazil
| | - Elena Sulleiro
- Department of Microbiology, Vall d’Hebron University Hospital. Universitat Autònoma de Barcelona. PROSICS Barcelona. Spain
| | - Aroa Silgado Gimenez
- Department of Microbiology, Vall d’Hebron University Hospital. Universitat Autònoma de Barcelona. PROSICS Barcelona. Spain
| | - Marta de Lana
- School of Pharmacy and Center for Research in Biological Sciences (NUPEB), Federal University of Ouro Preto (UFOP), Ouro Preto, MG, Brazil
| | - Bianca Zingales
- Department of Biochemistry, Institute of Chemistry, University of São Paulo (USP), São Paulo, SP, Brazil
| | - João Santana da Silva
- Department of Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo (FMRP-USP), Ribeirão Preto, SP, Brazil.
| | - J. Antônio Marin-Neto
- Department of Internal Medicine, Cardiology Division, Medical School of Ribeirão Preto, University of São Paulo (FMRP-USP), Ribeirão Preto, SP, Brazil
| | - Israel Molina
- Department of Infectious Diseases, Universitat Autònoma de Barcelona, Vall d’Hebron University Hospital. PROSICS, Barcelona. Spain
- * E-mail:
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Contributions of molecular techniques in the chronic phase of Chagas disease in the absence of treatment. Enferm Infecc Microbiol Clin 2020; 38:356-360. [PMID: 32087978 DOI: 10.1016/j.eimc.2020.01.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 12/31/2019] [Accepted: 01/03/2020] [Indexed: 12/19/2022]
Abstract
INTRODUCTION The chronic phase of Chagas disease (CD) is characterised by a low and intermittent parasitaemia. The Polymerase Chain Reaction (PCR) presents a variable sensitivity in this stage limiting its use as a diagnostic tool. Despite this, the use of PCR in untreated patients can provide information on the parasite behaviour and its presence in peripheral blood. METHODS A timely real-time PCR determination was performed on a cohort of 495 untreated chronic CD patients. Also, a subcohort of 29 patients was followed-up by serial real-time PCR during a period from 8 to 12 months in which they could not have access to the treatment due to lack of supply. RESULTS The positive percentage of real-time PCR in our series was 42%. Nevertheless, real-time PCR positive results were significantly higher in patients with five years or less of residence in Spain (P=.041). The detection of DNA was not related to the existence of cardiac and/or gastrointestinal abnormalities. In the follow-up subgroup, real-time PCR was consistently positive in 13.8% of patients, consistently negative in 31%, and intermittent in 55.2%. CONCLUSIONS The different real-time PCR results regarding the time of residence suggests the possible relationship of external factors in the parasite presence in peripheral blood. On the other hand, specific host factors may be involved in the behaviour of parasitaemia over time.
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13
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Hagström L, Marques ALP, Nitz N, Hecht MM. The use of qPCR in human Chagas disease: a systematic review. Expert Rev Mol Diagn 2019; 19:875-894. [DOI: 10.1080/14737159.2019.1659729] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Luciana Hagström
- Laboratório Interdisciplinar de Biociências, Faculdade de Medicina, Universidade de Brasília, Campus Darcy Ribeiro, Brasília, Brazil
| | - Ana Luisa Pereira Marques
- Laboratório Interdisciplinar de Biociências, Faculdade de Medicina, Universidade de Brasília, Campus Darcy Ribeiro, Brasília, Brazil
| | - Nadjar Nitz
- Laboratório Interdisciplinar de Biociências, Faculdade de Medicina, Universidade de Brasília, Campus Darcy Ribeiro, Brasília, Brazil
| | - Mariana Machado Hecht
- Laboratório Interdisciplinar de Biociências, Faculdade de Medicina, Universidade de Brasília, Campus Darcy Ribeiro, Brasília, Brazil
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Del-Rei RP, Leony LM, Celedon PAF, Zanchin NIT, dos Reis MG, Gomes YDM, Schijman AG, Longhi SA, Santos FLN. Detection of anti-Trypanosoma cruzi antibodies by chimeric antigens in chronic Chagas disease-individuals from endemic South American countries. PLoS One 2019; 14:e0215623. [PMID: 30998741 PMCID: PMC6472793 DOI: 10.1371/journal.pone.0215623] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 04/04/2019] [Indexed: 12/21/2022] Open
Abstract
Background Laboratory diagnosis of chronic Chagas disease is a troubling factor due to lack of reference tests. The WHO suggests the use of two distinct commercial serological tests in parallel. The performance of commercial immunoassays might fluctuate depending on the antigenic matrices and the local strains of T. cruzi in different geographical settings. The use of antigenic matrices based on chimeric proteins can solve these limitations. Here, we evaluated the diagnostic performance of two chimeric T. cruzi antigens (IBMP-8.1 and -8.4) to diagnose chronic Chagas disease in individuals from endemic South American countries. Methodology/Principal findings IBMP-8.1 and IBMP-8.4 chimeric antigens were expressed as soluble proteins in E. coli and purified using chromatography methods. Reactivity of IBMP-8.1 and IBMP-8.4 was assessed using an in-house ELISA with sera from 122 non-infected and 215 T. cruzi-infected individuals from Argentina, Bolivia, and Paraguay. Cut-off values were based on ROC curves and performance parameters were determined using a dichotomous approach. Area under the curve values were > 99.7% for both IBMP-8.1 and IBMP-8.4 antigens. IgG levels in T. cruzi-positive and negative samples were higher for IBMP-8.4 than IBMP-8.1. Both IBMP-8.1 and -8.4 were 100% specific, while IBMP-8.4 were 100% sensitive compared to IBMP-8.1 (95.3%). Admitting RI values of 1.0 ± 0.10 as the inconclusive interval, 6.2% of the samples tested using IBMP-8.1 and 2.1% using IBMP-8.4 fell inside the grey zone. Based on accuracy and diagnostic odds ratio values, IBMP-8.4 presented the best performance. Differences in sensitivity and IgG levels among the samples from Argentina, Bolivia, and Paraguay were not significant. Conclusions/Significance Our findings showed a notable performance of IBMP-8.1 and -8.4 chimeric antigens in diagnosing chronic Chagas disease in individuals from endemic South American countries, confirming our hypothesis that these antigens could be used in geographical areas where distinct T. cruzi DTUs occur.
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Affiliation(s)
| | | | | | | | - Mitermayer Galvão dos Reis
- Gonçalo Moniz Institute, Oswaldo Cruz Foundation, Salvador, Bahia, Brazil
- Department of Pathology and Legal Medicine, Federal University of Bahia, Salvador, Bahia, Brazil
- Department of Epidemiology of Microbial Diseases, School of Public Health, Yale University, New Haven, Connecticut, United States of America
| | | | - Alejandro Gabriel Schijman
- Laboratory of Molecular Biology of Chagas Disease, Institute for Research on Genetic Engineering and Molecular Biology “Dr Héctor Torres”, Buenos Aires, Argentina
| | - Silvia Andrea Longhi
- Laboratory of Molecular Biology of Chagas Disease, Institute for Research on Genetic Engineering and Molecular Biology “Dr Héctor Torres”, Buenos Aires, Argentina
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15
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Immune reactivity to Trypanosoma cruzi chimeric proteins for Chagas disease diagnosis in immigrants living in a non-endemic setting. BMC Infect Dis 2019; 19:251. [PMID: 30871504 PMCID: PMC6419348 DOI: 10.1186/s12879-019-3872-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Accepted: 03/04/2019] [Indexed: 02/06/2023] Open
Abstract
Background Chronic Chagas Disease (CD) diagnosis is based on serological methods employing crude, semipurified or recombinant antigens, which may result in low sensitivity or cross-reactivity. To reduce these restrictions, we developed a strategy involving use of molecules containing repetitive fragments of Trypanosoma cruzi conserved proteins. Diagnostic performance of IBMP-8.1 and IBMP-8.4 chimeric antigens (Molecular Biology Institute of Paraná - IBMP in Portuguese acronym) was assessed to diagnose T. cruzi-infected and non-infected immigrants living in Barcelona (Spain), a non-endemic setting for Chagas disease. Methods Reactivity of IBMP-8.1 and IBMP-8.4 was assessed using an in-house automated ELISA with 347 positive and 331 negative individuals to Chagas disease. Antigenic cross-reactivity was measured with sera samples from pregnant women with Toxoplasma gondii (n = 98) and Zika virus (n = 75) antibodies. Results The area under the curve values was 1 and 0.99 for the IBMP-8.1 and IBMP-8.4 proteins, respectively, demonstrating excellent diagnostic accuracy. The reactivity index was higher for IBMP-8.1 than IBMP-8.4 in positive samples and no significant difference in reactivity index was observed in negative samples. Sensitivity ranged from 99.4% for IBMP-8.1 to 99.1% for IBMP-8.4 and was not statistically different. Specificity for IBMP-8.1 reached 100 and 99.7% for IBMP-8.4, both nearly 100% accurate. No antigenic cross-reactivity was observed and reactivity index was similar to that for negative Chagas disease individuals. Conclusions Our results showed an outstanding performance of IBMP-8.1 and IBMP-8.4 chimeric antigens by ELISA and suggest both chimeric antigens could also be used for Chagas disease diagnosis in immigrants living in non-endemic settings.
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Villanueva-Lizama L, Teh-Poot C, Majeau A, Herrera C, Dumonteil E. Molecular Genotyping of Trypanosoma cruzi by Next-Generation Sequencing of the Mini-Exon Gene Reveals Infections With Multiple Parasite Discrete Typing Units in Chagasic Patients From Yucatan, Mexico. J Infect Dis 2019; 219:1980-1988. [DOI: 10.1093/infdis/jiz047] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 01/25/2019] [Indexed: 12/19/2022] Open
Affiliation(s)
- Liliana Villanueva-Lizama
- Laboratorio de Parasitologia, Centro de Investigaciones Regionales “Dr. Hideyo Noguchi,” Universidad Autonoma de Yucatan, Merida, Mexico
| | - Christian Teh-Poot
- Laboratorio de Parasitologia, Centro de Investigaciones Regionales “Dr. Hideyo Noguchi,” Universidad Autonoma de Yucatan, Merida, Mexico
| | - Alicia Majeau
- Department of Tropical Medicine, School of Public Health and Tropical Medicine
- Vector-Borne and Infectious Disease Research Center, Tulane University, New Orleans, Louisiana
| | - Claudia Herrera
- Department of Tropical Medicine, School of Public Health and Tropical Medicine
- Vector-Borne and Infectious Disease Research Center, Tulane University, New Orleans, Louisiana
| | - Eric Dumonteil
- Department of Tropical Medicine, School of Public Health and Tropical Medicine
- Vector-Borne and Infectious Disease Research Center, Tulane University, New Orleans, Louisiana
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17
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Pronovost H, Peterson AC, Chavez BG, Blum MJ, Dumonteil E, Herrera CP. Deep sequencing reveals multiclonality and new discrete typing units of Trypanosoma cruzi in rodents from the southern United States. JOURNAL OF MICROBIOLOGY, IMMUNOLOGY, AND INFECTION = WEI MIAN YU GAN RAN ZA ZHI 2018; 53:622-633. [PMID: 30709717 DOI: 10.1016/j.jmii.2018.12.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 11/26/2018] [Accepted: 12/07/2018] [Indexed: 12/24/2022]
Abstract
BACKGROUND/PURPOSE The parasitic protozoa Trypanosoma cruzi, is widely distributed throughout the Americas. We explored the nature of T. cruzi infection in small rodents from New Orleans (LA, USA), an enzootic region of the parasite in North America. METHODS We characterized the full complement of discrete typing units (DTUs) in rodent hosts through next-generation metabarcoding, as conventional PCR and Sanger sequencing approaches only detect the dominant genotype in biological samples. We assayed DTU diversity in tissue samples from 6 T. cruzi PCR positive rodents. The intergenic region of the mini-exon gene was amplified and sequenced on a MiSeq platform. A total of 141 sequences were aligned using Muscle, and TCS networks were constructed to identify DTUs in the samples. RESULTS We detected distinct and varying assemblages of DTUs in the rodent hosts. Highly diverse DTU assemblages were detected, with 6-32 haplotypes recovered per individual, spanning multiple DTUs (TcI,TcII, TcIV, TcV and TcVI). Haplotypes varied in frequencies from 82% to less than 0.1%. DTU composition varied according to the tissue analyzed. Rural and urban rodents carried similarly diverse DTU assemblages, though urban rodent species tended to harbor more haplotypes than their sylvatic counterparts. CONCLUSION Our results affirm that mammalian hosts can concurrently harbor a diverse complement of parasites, and indicate that there is greater diversity of T. cruzi DTUs present in North America than previously thought. Further investigation is warranted to understand the role of commensal rodents as a reservoir for T. cruzi in sylvatic and peridomestic environments.
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Affiliation(s)
- Henry Pronovost
- Department of Tropical Medicine, Vector-Borne Infectious Disease Research Center, Tulane University, School of Public Health and Tropical Medicine, New Orleans, LA, USA
| | - Anna C Peterson
- Department of Ecology & Evolutionary Biology, Tulane University, New Orleans, LA, USA; Department of Ecology & Evolutionary Biology University of Tennessee, Knoxville, USA
| | - Bruno Ghersi Chavez
- Department of Ecology & Evolutionary Biology, Tulane University, New Orleans, LA, USA; Department of Ecology & Evolutionary Biology University of Tennessee, Knoxville, USA
| | - Michael J Blum
- Department of Ecology & Evolutionary Biology, Tulane University, New Orleans, LA, USA; Department of Ecology & Evolutionary Biology University of Tennessee, Knoxville, USA
| | - Eric Dumonteil
- Department of Tropical Medicine, Vector-Borne Infectious Disease Research Center, Tulane University, School of Public Health and Tropical Medicine, New Orleans, LA, USA
| | - Claudia P Herrera
- Department of Tropical Medicine, Vector-Borne Infectious Disease Research Center, Tulane University, School of Public Health and Tropical Medicine, New Orleans, LA, USA.
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18
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Strauss M, Velázquez López DA, Moya DM, Bazán PC, Báez AL, Rivarola HW, Paglini-Oliva PA, Lo Presti MS. Differential tissue distribution of Trypanosoma cruzi during acute experimental infection: Further evidence using natural isolates. Mol Biochem Parasitol 2018; 222:29-33. [PMID: 29709547 DOI: 10.1016/j.molbiopara.2018.04.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 04/20/2018] [Accepted: 04/26/2018] [Indexed: 10/17/2022]
Abstract
In the present work, we evaluated the effect of mixed Trypanosoma cruzi infections, studying the biological distribution of the different parasites in blood, heart and skeletal muscle during the acute phase. Albino Swiss mice were infected with different parasite strain/isolates or with a combination of them. The parasites in the different tissues were typified through specific PCR, population variability was analyzed through RFLP studies and parasitological and histopathological parameters were evaluated. We found a predominance of TcII and TcVI in all tissues samples respect to TcV and different parasite populations were found in circulation and in the tissues from the same host. These results verify the distribution of parasites in host tissues from early stages of infection and show biological interactions among different genotypes and populations of T. cruzi.
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Affiliation(s)
- Mariana Strauss
- Instituto de Investigaciones en Ciencias de la Salud (INICSA) UNC - CONICET, Centro de Estudios e Investigación de la Enfermedad de Chagas y Leishmaniasis, Cátedra de Física Biomédica, Facultad de Ciencias Médicas, Córdoba, Argentina
| | - Daniela A Velázquez López
- Instituto de Investigaciones en Ciencias de la Salud (INICSA) UNC - CONICET, Centro de Estudios e Investigación de la Enfermedad de Chagas y Leishmaniasis, Cátedra de Física Biomédica, Facultad de Ciencias Médicas, Córdoba, Argentina
| | - Diego M Moya
- Instituto de Investigaciones en Ciencias de la Salud (INICSA) UNC - CONICET, Centro de Estudios e Investigación de la Enfermedad de Chagas y Leishmaniasis, Cátedra de Física Biomédica, Facultad de Ciencias Médicas, Córdoba, Argentina
| | - P Carolina Bazán
- Instituto de Investigaciones en Ciencias de la Salud (INICSA) UNC - CONICET, Centro de Estudios e Investigación de la Enfermedad de Chagas y Leishmaniasis, Cátedra de Física Biomédica, Facultad de Ciencias Médicas, Córdoba, Argentina
| | - Alejandra L Báez
- Instituto de Investigaciones en Ciencias de la Salud (INICSA) UNC - CONICET, Centro de Estudios e Investigación de la Enfermedad de Chagas y Leishmaniasis, Cátedra de Física Biomédica, Facultad de Ciencias Médicas, Córdoba, Argentina
| | - H Walter Rivarola
- Instituto de Investigaciones en Ciencias de la Salud (INICSA) UNC - CONICET, Centro de Estudios e Investigación de la Enfermedad de Chagas y Leishmaniasis, Cátedra de Física Biomédica, Facultad de Ciencias Médicas, Córdoba, Argentina
| | - Patricia A Paglini-Oliva
- Instituto de Investigaciones en Ciencias de la Salud (INICSA) UNC - CONICET, Centro de Estudios e Investigación de la Enfermedad de Chagas y Leishmaniasis, Cátedra de Física Biomédica, Facultad de Ciencias Médicas, Córdoba, Argentina
| | - M Silvina Lo Presti
- Instituto de Investigaciones en Ciencias de la Salud (INICSA) UNC - CONICET, Centro de Estudios e Investigación de la Enfermedad de Chagas y Leishmaniasis, Cátedra de Física Biomédica, Facultad de Ciencias Médicas, Córdoba, Argentina.
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Ramírez JC, Torres C, Curto MDLA, Schijman AG. New insights into Trypanosoma cruzi evolution, genotyping and molecular diagnostics from satellite DNA sequence analysis. PLoS Negl Trop Dis 2017; 11:e0006139. [PMID: 29253860 PMCID: PMC5749901 DOI: 10.1371/journal.pntd.0006139] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 01/02/2018] [Accepted: 11/28/2017] [Indexed: 11/18/2022] Open
Abstract
Trypanosoma cruzi has been subdivided into seven Discrete Typing Units (DTUs), TcI-TcVI and Tcbat. Two major evolutionary models have been proposed to explain the origin of hybrid lineages, but while it is widely accepted that TcV and TcVI are the result of genetic exchange between TcII and TcIII strains, the origin of TcIII and TcIV is still a matter of debate. T. cruzi satellite DNA (SatDNA), comprised of 195 bp units organized in tandem repeats, from both TcV and TcVI stocks were found to have SatDNA copies type TcI and TcII; whereas contradictory results were observed for TcIII stocks and no TcIV sequence has been analyzed yet. Herein, we have gone deeper into this matter analyzing 335 distinct SatDNA sequences from 19 T. cruzi stocks representative of DTUs TcI-TcVI for phylogenetic inference. Bayesian phylogenetic tree showed that all sequences were grouped in three major clusters, which corresponded to sequences from DTUs TcI/III, TcII and TcIV; whereas TcV and TcVI stocks had two sets of sequences distributed into TcI/III and TcII clusters. As expected, the lowest genetic distances were found between TcI and TcIII, and between TcV and TcVI sequences; whereas the highest ones were observed between TcII and TcI/III, and among TcIV sequences and those from the remaining DTUs. In addition, signature patterns associated to specific T. cruzi lineages were identified and new primers that improved SatDNA-based qPCR sensitivity were designed. Our findings support the theory that TcIII is not the result of a hybridization event between TcI and TcII, and that TcIV had an independent origin from the other DTUs, contributing to clarifying the evolutionary history of T. cruzi lineages. Moreover, this work opens the possibility of typing samples from Chagas disease patients with low parasitic loads and improving molecular diagnostic methods of T. cruzi infection based on SatDNA sequence amplification.
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Affiliation(s)
- Juan C. Ramírez
- Laboratorio de Biología Molecular de la Enfermedad de Chagas, Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres" (INGEBI), CONICET, Buenos Aires, Argentina
- * E-mail: (JCR); (AGS)
| | - Carolina Torres
- Departamento de Microbiología, Inmunología y Biotecnología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
- CONICET, Buenos Aires, Argentina
| | - María de los A. Curto
- Laboratorio de Biología Molecular de la Enfermedad de Chagas, Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres" (INGEBI), CONICET, Buenos Aires, Argentina
| | - Alejandro G. Schijman
- Laboratorio de Biología Molecular de la Enfermedad de Chagas, Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres" (INGEBI), CONICET, Buenos Aires, Argentina
- * E-mail: (JCR); (AGS)
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