Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal d...
- Autores
- Muñoz Calderon, Arturo Alejandro; Díaz Bello, Zoraida; Alarcón de Noya, Belkisyolé; Schijman, Alejandro Gabriel
- Año de publicación
- 2019
- Idioma
- inglés
- Tipo de recurso
- documento de conferencia
- Estado
- versión publicada
- Descripción
- Oral transmission of Chagas disease (OChD) is an increasingly important aspect in the epidemiology. Venezuela has reported the two largest outbreaks described so far, affecting a total of 192 people mostly children. The long-term impact after treatment on the dynamics of infection in natural populations of T. cruzi is still unclear. In this sense, we proposed a genetic characterization of T. cruzi populations present in peripheral blood in order to differentiate responder or non-responder patients and predict the response to treatment (Tmt). We performed quantification of the parasitic load by qPCR, genetic typing of T. cruzi populations by multiplex qPCR of nuclear genome markers and RFLP-PCR for the hypervariable region of T. cruzi kDNA to demonstrate changes in Minicircle signatures (Ms) of the parasite populations present in 41 clinical samples from 15 patients. To reflect the genetic diversity found, Jaccard distances (Jd) values were compared. This clinical monitoring confirmed the presence of T. cruzi DNA in 26 post-treatment samples up to 9 years after Tmt. These results reveal 100 % therapeutic failure for both outbreaks of OChD, classifying these patients as non-responders to Tmt. All samples showed homogeneity at the DTU level, being typified as TcI. The Ms showed a high degree of polymorphism, with 73 % of total post-Tmt samples with Jd values close to 1. Analyzing the dynamics of each patient`s population separately, in all post-Tmt samples the change in Ms variability respect to pre-Tmt sample was not statistically significant. This variability does not reflect a natural or induced clonal selection process driven by the etiological Tmt; on the contrary, it could be associated with the clonal histotropism process evidenced in natural T. cruzi infections. In conclusion, these strategies of molecular characterization of parasite DNA were useful to detect Tmt failure and find out the lack of parasite population selection with Tmt in these OChD settings.
Fil: Muñoz Calderon, Arturo Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres"; Argentina
Fil: Díaz Bello, Zoraida. Instituto de Medicina Tropical "Dr. Felix Pifano"; Venezuela
Fil: Alarcón de Noya, Belkisyolé. Instituto de Medicina Tropical "Dr. Felix Pifano"; Venezuela
Fil: Schijman, Alejandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres"; Argentina
LXIV Reunión Anual de la Sociedad Argentina de Investigación Clínica; LI Reunión Anual de la Asociación Argentina de Farmacología Experimental; XXI Reunión Anual de la Sociedad Argentina de Biología; XXXI Reunión Anual de la Sociedad Argentina de Protozoología; IX Reunión Anual de la Asociación Argentina de Nanomedicinas; VI Reunión Científica Regional de la Asociación Argentina de Ciencia y Tecnología de Animales de Laboratorio
Mar del Plata
Argentina
Sociedad Argentina de Investigación Clínica
Asociación Argentina de Farmacología Experimenta
Sociedad Argentina de Biología
Sociedad Argentina de Protozoología
Asociación Argentina de Nanomedicinas
Asociación Argentina de Ciencia y Tecnología de Animales de Laboratorio - Materia
-
Trypanosoma cruzi
Oral Chagas disease
Treatment
Follow up - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/202025
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Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugsMuñoz Calderon, Arturo AlejandroDíaz Bello, ZoraidaAlarcón de Noya, BelkisyoléSchijman, Alejandro GabrielTrypanosoma cruziOral Chagas diseaseTreatmentFollow uphttps://purl.org/becyt/ford/3.3https://purl.org/becyt/ford/3Oral transmission of Chagas disease (OChD) is an increasingly important aspect in the epidemiology. Venezuela has reported the two largest outbreaks described so far, affecting a total of 192 people mostly children. The long-term impact after treatment on the dynamics of infection in natural populations of T. cruzi is still unclear. In this sense, we proposed a genetic characterization of T. cruzi populations present in peripheral blood in order to differentiate responder or non-responder patients and predict the response to treatment (Tmt). We performed quantification of the parasitic load by qPCR, genetic typing of T. cruzi populations by multiplex qPCR of nuclear genome markers and RFLP-PCR for the hypervariable region of T. cruzi kDNA to demonstrate changes in Minicircle signatures (Ms) of the parasite populations present in 41 clinical samples from 15 patients. To reflect the genetic diversity found, Jaccard distances (Jd) values were compared. This clinical monitoring confirmed the presence of T. cruzi DNA in 26 post-treatment samples up to 9 years after Tmt. These results reveal 100 % therapeutic failure for both outbreaks of OChD, classifying these patients as non-responders to Tmt. All samples showed homogeneity at the DTU level, being typified as TcI. The Ms showed a high degree of polymorphism, with 73 % of total post-Tmt samples with Jd values close to 1. Analyzing the dynamics of each patient`s population separately, in all post-Tmt samples the change in Ms variability respect to pre-Tmt sample was not statistically significant. This variability does not reflect a natural or induced clonal selection process driven by the etiological Tmt; on the contrary, it could be associated with the clonal histotropism process evidenced in natural T. cruzi infections. In conclusion, these strategies of molecular characterization of parasite DNA were useful to detect Tmt failure and find out the lack of parasite population selection with Tmt in these OChD settings.Fil: Muñoz Calderon, Arturo Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres"; ArgentinaFil: Díaz Bello, Zoraida. Instituto de Medicina Tropical "Dr. Felix Pifano"; VenezuelaFil: Alarcón de Noya, Belkisyolé. Instituto de Medicina Tropical "Dr. Felix Pifano"; VenezuelaFil: Schijman, Alejandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres"; ArgentinaLXIV Reunión Anual de la Sociedad Argentina de Investigación Clínica; LI Reunión Anual de la Asociación Argentina de Farmacología Experimental; XXI Reunión Anual de la Sociedad Argentina de Biología; XXXI Reunión Anual de la Sociedad Argentina de Protozoología; IX Reunión Anual de la Asociación Argentina de Nanomedicinas; VI Reunión Científica Regional de la Asociación Argentina de Ciencia y Tecnología de Animales de LaboratorioMar del PlataArgentinaSociedad Argentina de Investigación ClínicaAsociación Argentina de Farmacología ExperimentaSociedad Argentina de BiologíaSociedad Argentina de ProtozoologíaAsociación Argentina de NanomedicinasAsociación Argentina de Ciencia y Tecnología de Animales de LaboratorioFundación Revista Medicina2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/202025Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugs; LXIV Reunión Anual de la Sociedad Argentina de Investigación Clínica; LI Reunión Anual de la Asociación Argentina de Farmacología Experimental; XXI Reunión Anual de la Sociedad Argentina de Biología; XXXI Reunión Anual de la Sociedad Argentina de Protozoología; IX Reunión Anual de la Asociación Argentina de Nanomedicinas; VI Reunión Científica Regional de la Asociación Argentina de Ciencia y Tecnología de Animales de Laboratorio; Mar del Plata; Argentina; 2019; 123-1230025-76801669-9106CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://medicinabuenosaires.com/revistas/vol79-19/s4/vol79_s4.pdfInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:33:36Zoai:ri.conicet.gov.ar:11336/202025instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:33:36.659CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugs |
title |
Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugs |
spellingShingle |
Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugs Muñoz Calderon, Arturo Alejandro Trypanosoma cruzi Oral Chagas disease Treatment Follow up |
title_short |
Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugs |
title_full |
Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugs |
title_fullStr |
Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugs |
title_full_unstemmed |
Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugs |
title_sort |
Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugs |
dc.creator.none.fl_str_mv |
Muñoz Calderon, Arturo Alejandro Díaz Bello, Zoraida Alarcón de Noya, Belkisyolé Schijman, Alejandro Gabriel |
author |
Muñoz Calderon, Arturo Alejandro |
author_facet |
Muñoz Calderon, Arturo Alejandro Díaz Bello, Zoraida Alarcón de Noya, Belkisyolé Schijman, Alejandro Gabriel |
author_role |
author |
author2 |
Díaz Bello, Zoraida Alarcón de Noya, Belkisyolé Schijman, Alejandro Gabriel |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Trypanosoma cruzi Oral Chagas disease Treatment Follow up |
topic |
Trypanosoma cruzi Oral Chagas disease Treatment Follow up |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/3.3 https://purl.org/becyt/ford/3 |
dc.description.none.fl_txt_mv |
Oral transmission of Chagas disease (OChD) is an increasingly important aspect in the epidemiology. Venezuela has reported the two largest outbreaks described so far, affecting a total of 192 people mostly children. The long-term impact after treatment on the dynamics of infection in natural populations of T. cruzi is still unclear. In this sense, we proposed a genetic characterization of T. cruzi populations present in peripheral blood in order to differentiate responder or non-responder patients and predict the response to treatment (Tmt). We performed quantification of the parasitic load by qPCR, genetic typing of T. cruzi populations by multiplex qPCR of nuclear genome markers and RFLP-PCR for the hypervariable region of T. cruzi kDNA to demonstrate changes in Minicircle signatures (Ms) of the parasite populations present in 41 clinical samples from 15 patients. To reflect the genetic diversity found, Jaccard distances (Jd) values were compared. This clinical monitoring confirmed the presence of T. cruzi DNA in 26 post-treatment samples up to 9 years after Tmt. These results reveal 100 % therapeutic failure for both outbreaks of OChD, classifying these patients as non-responders to Tmt. All samples showed homogeneity at the DTU level, being typified as TcI. The Ms showed a high degree of polymorphism, with 73 % of total post-Tmt samples with Jd values close to 1. Analyzing the dynamics of each patient`s population separately, in all post-Tmt samples the change in Ms variability respect to pre-Tmt sample was not statistically significant. This variability does not reflect a natural or induced clonal selection process driven by the etiological Tmt; on the contrary, it could be associated with the clonal histotropism process evidenced in natural T. cruzi infections. In conclusion, these strategies of molecular characterization of parasite DNA were useful to detect Tmt failure and find out the lack of parasite population selection with Tmt in these OChD settings. Fil: Muñoz Calderon, Arturo Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres"; Argentina Fil: Díaz Bello, Zoraida. Instituto de Medicina Tropical "Dr. Felix Pifano"; Venezuela Fil: Alarcón de Noya, Belkisyolé. Instituto de Medicina Tropical "Dr. Felix Pifano"; Venezuela Fil: Schijman, Alejandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres"; Argentina LXIV Reunión Anual de la Sociedad Argentina de Investigación Clínica; LI Reunión Anual de la Asociación Argentina de Farmacología Experimental; XXI Reunión Anual de la Sociedad Argentina de Biología; XXXI Reunión Anual de la Sociedad Argentina de Protozoología; IX Reunión Anual de la Asociación Argentina de Nanomedicinas; VI Reunión Científica Regional de la Asociación Argentina de Ciencia y Tecnología de Animales de Laboratorio Mar del Plata Argentina Sociedad Argentina de Investigación Clínica Asociación Argentina de Farmacología Experimenta Sociedad Argentina de Biología Sociedad Argentina de Protozoología Asociación Argentina de Nanomedicinas Asociación Argentina de Ciencia y Tecnología de Animales de Laboratorio |
description |
Oral transmission of Chagas disease (OChD) is an increasingly important aspect in the epidemiology. Venezuela has reported the two largest outbreaks described so far, affecting a total of 192 people mostly children. The long-term impact after treatment on the dynamics of infection in natural populations of T. cruzi is still unclear. In this sense, we proposed a genetic characterization of T. cruzi populations present in peripheral blood in order to differentiate responder or non-responder patients and predict the response to treatment (Tmt). We performed quantification of the parasitic load by qPCR, genetic typing of T. cruzi populations by multiplex qPCR of nuclear genome markers and RFLP-PCR for the hypervariable region of T. cruzi kDNA to demonstrate changes in Minicircle signatures (Ms) of the parasite populations present in 41 clinical samples from 15 patients. To reflect the genetic diversity found, Jaccard distances (Jd) values were compared. This clinical monitoring confirmed the presence of T. cruzi DNA in 26 post-treatment samples up to 9 years after Tmt. These results reveal 100 % therapeutic failure for both outbreaks of OChD, classifying these patients as non-responders to Tmt. All samples showed homogeneity at the DTU level, being typified as TcI. The Ms showed a high degree of polymorphism, with 73 % of total post-Tmt samples with Jd values close to 1. Analyzing the dynamics of each patient`s population separately, in all post-Tmt samples the change in Ms variability respect to pre-Tmt sample was not statistically significant. This variability does not reflect a natural or induced clonal selection process driven by the etiological Tmt; on the contrary, it could be associated with the clonal histotropism process evidenced in natural T. cruzi infections. In conclusion, these strategies of molecular characterization of parasite DNA were useful to detect Tmt failure and find out the lack of parasite population selection with Tmt in these OChD settings. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/conferenceObject Reunión Journal http://purl.org/coar/resource_type/c_5794 info:ar-repo/semantics/documentoDeConferencia |
status_str |
publishedVersion |
format |
conferenceObject |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/202025 Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugs; LXIV Reunión Anual de la Sociedad Argentina de Investigación Clínica; LI Reunión Anual de la Asociación Argentina de Farmacología Experimental; XXI Reunión Anual de la Sociedad Argentina de Biología; XXXI Reunión Anual de la Sociedad Argentina de Protozoología; IX Reunión Anual de la Asociación Argentina de Nanomedicinas; VI Reunión Científica Regional de la Asociación Argentina de Ciencia y Tecnología de Animales de Laboratorio; Mar del Plata; Argentina; 2019; 123-123 0025-7680 1669-9106 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/202025 |
identifier_str_mv |
Genetic diversity of natural populations of Trypanosoma cruzi in clinical samples from patients with oral Chagas disease in Venezuela: Follow-up after treatment with trypanocidal drugs; LXIV Reunión Anual de la Sociedad Argentina de Investigación Clínica; LI Reunión Anual de la Asociación Argentina de Farmacología Experimental; XXI Reunión Anual de la Sociedad Argentina de Biología; XXXI Reunión Anual de la Sociedad Argentina de Protozoología; IX Reunión Anual de la Asociación Argentina de Nanomedicinas; VI Reunión Científica Regional de la Asociación Argentina de Ciencia y Tecnología de Animales de Laboratorio; Mar del Plata; Argentina; 2019; 123-123 0025-7680 1669-9106 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://medicinabuenosaires.com/revistas/vol79-19/s4/vol79_s4.pdf |
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info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
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https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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application/pdf application/pdf application/pdf |
dc.coverage.none.fl_str_mv |
Internacional |
dc.publisher.none.fl_str_mv |
Fundación Revista Medicina |
publisher.none.fl_str_mv |
Fundación Revista Medicina |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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13.070432 |