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Alonso Llorente A, Salgado Garrido J, Teijido Hermida Ó, González Andrade F, Valiente Martín A, Fanlo Villacampa AJ, Vicente Romero J. Genetic polymorphisms of CYP2C19 in ecuadorian population: An interethnic approach. Heliyon 2024; 10:e28566. [PMID: 38586400 PMCID: PMC10998100 DOI: 10.1016/j.heliyon.2024.e28566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Accepted: 03/20/2024] [Indexed: 04/09/2024] Open
Abstract
Introduction CYP2C19 is a highly polymorphic gene responsible for metabolizing commonly used drugs. CYP2C19*2,*3 (loss of activity alleles) and *17 (increased activity allele) are the principal alleles included in clinical guidelines, however their prevalence varies among different ethnicities. Ecuadorian population is formed by Mestizos, Afrodescendants and Native Americans and frequency of CYP2C19 alleles could be different among them. The objective of this study was to establish the frequency of these variants in the different populations of Ecuador and to compare them with other populations. Materials and methods DNA from 105 Afrodescendants, 75 Native Americans of the Kichwa ethnicity, and 33 Mestizos Ecuadorians was analyzed by nested-PCR to identify CYP2C19*17 carriers. CYP2C19*2 allele was analyzed in DNA from 78 Afrodescendants, 29 Native Americans of the Kichwa, and 16 Mestizos by TaqMan Allelic Discrimination Assay. CYP2C19*3 was analyzed in 33 Afrodescendants by nested-PCR. Results The global frequencies of the alternate alleles were 14.22% (CYP2C19*2) and 2.10% (CYP2C19*17). No differences (p > 0.05) were observed among the subgroups. No CYP2C19*3 carrier was identified. CYP2C19*2 frequencies in Ecuador were similar to the ones reported in Europe, Africa and Middle East countries and to some American populations. Low CYP2C19*17 frequencies, like the ones in our population, were also observed in East and South Asia and in Native American groups. Discussion Absence of differences in the ethnic groups in Ecuador for CYP2C19*2 and *17 could be due to either a bias in sample selection (ethnic group was assed by self-identification) or to a high interethnic admixture in the Ecuadorian population that would had diluted genetic differences. In addition, CYP2C19*2, *3, and *17 alleles frequencies in our study suggest that Ecuadorians ancestry is mostly of Native American origin.
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Affiliation(s)
- Alba Alonso Llorente
- Clinical Laboratory Department, Hospital Universitario Arnau de Vilanova, Lleida, Catalunya, Spain
- Department of Pharmacology, Physiology and Legal and Forensic Medicine, Faculty of Medicine, University of Zaragoza, Zaragoza, Aragón, Spain
- IRBLleida, Institut de Recerca Biomèdica de Lleida Fundació Dr. Pifarre, Lleida, Catalunya, Spain
| | - Josefa Salgado Garrido
- Medical Genetics Department, Hospital Universitario de Navarra, Pamplona, Navarra, Spain
- Department of Biochemistry and Molecular Biology, Public University of Navarra (UPNA), Pamplona, Navarra, Spain
| | - Óscar Teijido Hermida
- Navarrabiomed, IdiSNA (Navarra Institute for Health Research), Public University of Navarra (UPNA), Pamplona, Navarra, Spain
| | | | | | - Ana Julia Fanlo Villacampa
- Department of Pharmacology, Physiology and Legal and Forensic Medicine, Faculty of Medicine, University of Zaragoza, Zaragoza, Aragón, Spain
| | - Jorge Vicente Romero
- Department of Pharmacology, Physiology and Legal and Forensic Medicine, Faculty of Medicine, University of Zaragoza, Zaragoza, Aragón, Spain
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Gallardo-Cóndor J, Naranjo P, Atarihuana S, Coello D, Guevara-Ramírez P, Flores-Espinoza R, Burgos G, López-Cortés A, Cabrera-Andrade A. Population-Specific Distribution of TPMT Deficiency Variants and Ancestry Proportions in Ecuadorian Ethnic Groups: Towards Personalized Medicine. Ther Clin Risk Manag 2023; 19:1005-1018. [PMID: 38050617 PMCID: PMC10693761 DOI: 10.2147/tcrm.s432856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Accepted: 11/06/2023] [Indexed: 12/06/2023] Open
Abstract
Purpose Thiopurine S-methyltransferase (TPMT) is an enzyme that metabolizes purine analogs, agents used in the treatment of acute lymphoblastic leukemia. Improper drug metabolism leads to toxicity in chemotherapy patients and reduces treatment effectiveness. TPMT variants associated with reduced enzymatic activity vary across populations. Therefore, studying these variants in heterogeneous populations, such as Ecuadorians, can help identify molecular causes of deficiency for this enzyme. Methods We sequenced the entire TPMT coding region in 550 Ecuadorian individuals from Afro-Ecuadorian, Indigenous, Mestizo, and Montubio ethnicities. Moreover, we conducted an ancestry analysis using 46 informative ancestry markers. Results We identified 8 single nucleotide variants in the coding region of TPMT. The most prevalent alleles were TPMT*3A, TPMT*3B, and TPMT*3C, with frequencies of 0.055, 0.012, and 0.015, respectively. Additionally, we found rare alleles TPMT*4 and TPMT*8 with frequencies of 0.005 and 0.003. Correlating the ancestry proportions with TPMT-deficient genotypes, we observed that the Native American ancestry proportion influenced the distribution of the TPMT*1/TPMT*3A genotype (OR = 5.977, p = 0.002), while the contribution of African ancestral populations was associated with the TPMT*1/TPMT*3C genotype (OR = 9.769, p = 0.003). The rates of TPMT-deficient genotypes observed in Mestizo (f = 0.121) and Indigenous (f = 0.273) groups provide evidence for the influence of Native American ancestry and the prevalence of the TPMT*3A allele. In contrast, although Afro-Ecuadorian groups demonstrate similar deficiency rates (f = 0.160), the genetic factors involved are associated with contributions from African ancestral populations, specifically the prevalent TPMT*3C allele. Conclusion The distribution of TPMT-deficient variants offers valuable insights into the populations under study, underscoring the necessity for genetic screening strategies to prevent thiopurine toxicity events among Latin American minority groups.
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Affiliation(s)
| | - Pablo Naranjo
- Facultad de Ingeniería y Ciencias Aplicadas, Universidad de Las Américas, Quito, Ecuador
| | - Sebastián Atarihuana
- Facultad de Ingeniería y Ciencias Aplicadas, Universidad de Las Américas, Quito, Ecuador
| | - Dayana Coello
- Laboratorios de Investigación, Universidad de Las Américas, Quito, Ecuador
| | - Patricia Guevara-Ramírez
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador
| | - Rodrigo Flores-Espinoza
- Laboratório de Diagnóstico por DNA (LDD), Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Germán Burgos
- One Health Research Group, Facultad de Medicina, Universidad de Las Américas, Quito, Ecuador
- Grupo de Medicina Xenomica, Instituto de Ciencias Forenses, Universidad de Santiago de Compostela, Satiago de Compostela, Spain
| | - Andrés López-Cortés
- Cancer Research Group (CRG), Faculty of Medicine, Universidad de Las Américas, Quito, Ecuador
- Latin American Network for the Implementation and Validation of Clinical Pharmacogenomics Guidelines (RELIVAF-CYTED), Madrid, Spain
| | - Alejandro Cabrera-Andrade
- Escuela de Enfermería, Facultad de Ciencias de la Salud, Universidad de Las Américas, Quito, Ecuador
- Grupo de Bio-Quimioinformática, Universidad de Las Américas, Quito, Ecuador
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Zhingre A, Bedoya-Pilozo C, Gutiérrez-Pallo D, Badano I, Herrera-Yela A, Salazar Z, Alarcón D, Argüello-Bravo N, Espinoza M, Ponce P, Soto Y, Carrazco-Montalvo A. Genetic Variability in the E6/E7 Region of Human Papillomavirus 16 in Women from Ecuador. Viruses 2023; 15:1393. [PMID: 37376692 PMCID: PMC10301947 DOI: 10.3390/v15061393] [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: 05/03/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
Human Papillomavirus (HPV) infection is associated with intraepithelial neoplasia and cervical cancer (CC). Ecuador has a high prevalence of cervical cancer, with more than 1600 new cases diagnosed annually. This study aimed to analyze oncogenes E6 and E7 of HPV16 in samples collected from women with cancerous and precancerous cervical lesions from the Ecuadorian coast. Twenty-nine women, including six with ASCUS, three with LSIL, thirteen with HSIL, and seven with Cacu, were analyzed. The most common SNPs were E6 350G or L83V (82.6%) and E6 145T/286A/289G/335T/350G or Q14H/F78Y/L83V (17.4%). Both variants are reported to be associated with an increased risk of cervical cancer in worldwide studies. In contrast, all E7 genes have conserved amino-acid positions. Phylogenetic trees showed the circulation of the D (26.1%) and A (73.9) lineages. The frequency of D was higher than that reported in other comparable studies in Ecuador and Latin America, and may be related to the ethnic composition of the studied populations. This study contributes to the characterization of the potential risk factors for cervical carcinogenesis associated with Ecuadorian women infected with HPV16.
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Affiliation(s)
- Alicia Zhingre
- Laboratorio de Biotecnología, Universidad Católica de Cuenca, Cuenca 010107, Ecuador; (A.Z.); (Z.S.)
| | - César Bedoya-Pilozo
- Hospital Luis Vernaza, Guayaquil 090306, Ecuador;
- Lab Genetics Ballenita, Santa Elena 241701, Ecuador
| | - Diana Gutiérrez-Pallo
- Instituto Nacional de Investigación en Salud Pública “Leopoldo Izquieta Pérez”, Centro de Referencia Nacional de Genómica, Secuenciación y Bioinformática, Quito 170403, Ecuador; (D.G.-P.); (D.A.)
| | - Inés Badano
- Laboratorio de Antropología Biológica y Bioinformática Aplicada, Red de Laboratorios, Universidad Nacional de Misiones and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Posadas N3300, Argentina;
| | - Andrés Herrera-Yela
- Facultad de Ingeniería, Maestría en Biología Computacional, Pontificia Universidad Católica del Ecuador, Quito 170803, Ecuador;
| | - Zoila Salazar
- Laboratorio de Biotecnología, Universidad Católica de Cuenca, Cuenca 010107, Ecuador; (A.Z.); (Z.S.)
| | - Damaris Alarcón
- Instituto Nacional de Investigación en Salud Pública “Leopoldo Izquieta Pérez”, Centro de Referencia Nacional de Genómica, Secuenciación y Bioinformática, Quito 170403, Ecuador; (D.G.-P.); (D.A.)
| | - Natali Argüello-Bravo
- Instituto Nacional de Investigación en Salud Pública “Leopoldo Izquieta Pérez”, Laboratorio de Influenza y Otros Virus Respiratorios, Quito 170403, Ecuador;
| | | | - Patricio Ponce
- Instituto Nacional de Investigación en Salud Pública “Leopoldo Izquieta Pérez”, Gestión de Investigación, Desarrollo e Innovación, Quito 170403, Ecuador;
| | - Yudira Soto
- Instituto de Medicina Tropical “Pedro Kouri”, Laboratorio de Infecciones de Transmisión Sexual, Departamento de Virología, Autopista Novia del Mediodía Km 6 ½, La Habana 10100, Cuba;
| | - Andrés Carrazco-Montalvo
- Instituto Nacional de Investigación en Salud Pública “Leopoldo Izquieta Pérez”, Centro de Referencia Nacional de Genómica, Secuenciación y Bioinformática, Quito 170403, Ecuador; (D.G.-P.); (D.A.)
- Departamento de Biología Molecular, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Universidad Autónoma de Madrid, 28049 Madrid, Spain
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Antão-Sousa S, Conde-Sousa E, Gusmão L, Amorim A, Pinto N. How often have X- and Autosomal-STRs mutations equivocal parental origin been assigned? FORENSIC SCIENCE INTERNATIONAL GENETICS SUPPLEMENT SERIES 2022. [DOI: 10.1016/j.fsigss.2022.09.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Flores-Espinoza R, Angulo-Pozo AN, Garzón-Salazar A, Cabrera-Andrade A, Paz-Cruz E, Burgos G, Gusmão L. EVALUATING POPULATION STRUCTURE OF ECUADOR FOR FORENSIC STR MARKERS. FORENSIC SCIENCE INTERNATIONAL GENETICS SUPPLEMENT SERIES 2022. [DOI: 10.1016/j.fsigss.2022.09.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Antão-Sousa S, Conde-Sousa E, Gusmão L, Amorim A, Pinto N. Estimations of Mutation Rates Depend on Population Allele Frequency Distribution: The Case of Autosomal Microsatellites. Genes (Basel) 2022; 13:genes13071248. [PMID: 35886031 PMCID: PMC9323320 DOI: 10.3390/genes13071248] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 06/28/2022] [Accepted: 07/11/2022] [Indexed: 01/27/2023] Open
Abstract
Microsatellites (or short-tandem repeats (STRs)) are widely used in anthropology and evolutionary studies. Their extensive polymorphism and rapid evolution make them the ideal genetic marker for dating events, such as the age of a gene or a population. This usage requires the estimation of mutation rates, which are usually estimated by counting the observed Mendelian incompatibilities in one-generation familial configurations (typically parent(s)–child duos or trios). Underestimations are inevitable when using this approach, due to the occurrence of mutational events that do not lead to incompatibilities with the parental genotypes (‘hidden’ or ‘covert’ mutations). It is known that the likelihood that one mutation event leads to a Mendelian incompatibility depends on the mode of genetic transmission considered, the type of familial configuration (duos or trios) considered, and the genotype(s) of the progenitor(s). In this work, we show how the magnitude of the underestimation of autosomal microsatellite mutation rates varies with the populations’ allele frequency distribution spectrum. The Mendelian incompatibilities approach (MIA) was applied to simulated parent(s)/offspring duos and trios in different populational scenarios. The results showed that the magnitude and type of biases depend on the population allele frequency distribution, whatever the type of familial data considered, and are greater when duos, instead of trios, are used to obtain the estimates. The implications for molecular anthropology are discussed and a simple framework is presented to correct the naïf estimates, along with an informatics tool for the correction of incompatibility rates obtained through the MIA.
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Affiliation(s)
- Sofia Antão-Sousa
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal; (E.C.-S.); (A.A.); (N.P.)
- Institute of Molecular Pathology and Immunology, University of Porto (IPATIMUP), 4200-465 Porto, Portugal
- Faculty of Sciences, University of Porto (FCUP), 4169-007 Porto, Portugal
- DNA Diagnostic Laboratory (LDD), State University of Rio de Janeiro (UERJ), Rio de Janeiro 20550-013, Brazil;
- Correspondence:
| | - Eduardo Conde-Sousa
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal; (E.C.-S.); (A.A.); (N.P.)
- Instituto de Engenharia Biomédica (INEB), 4200-135 Porto, Portugal
| | - Leonor Gusmão
- DNA Diagnostic Laboratory (LDD), State University of Rio de Janeiro (UERJ), Rio de Janeiro 20550-013, Brazil;
| | - António Amorim
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal; (E.C.-S.); (A.A.); (N.P.)
- Institute of Molecular Pathology and Immunology, University of Porto (IPATIMUP), 4200-465 Porto, Portugal
- Faculty of Sciences, University of Porto (FCUP), 4169-007 Porto, Portugal
| | - Nádia Pinto
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal; (E.C.-S.); (A.A.); (N.P.)
- Institute of Molecular Pathology and Immunology, University of Porto (IPATIMUP), 4200-465 Porto, Portugal
- Center of Mathematics, University of Porto (CMUP), 4169-007 Porto, Portugal
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