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Souza AMD, Resende SS, Sousa TND, Brito CFAD. A systematic scoping review of the genetic ancestry of the Brazilian population. Genet Mol Biol 2019; 42:495-508. [PMID: 31188926 PMCID: PMC6905439 DOI: 10.1590/1678-4685-gmb-2018-0076] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 01/16/2019] [Indexed: 12/27/2022] Open
Abstract
The genetic background of the Brazilian population is mainly characterized by
three parental populations: European, African, and Native American. The aim of
this study was to overview the genetic ancestry estimates for different
Brazilian geographic regions and analyze factors involved in these estimates. In
this systematic scoping review were included 51 studies, comprehending 81
populations of 19 states from five regions of Brazil. To reduce the potential of
bias from studies with different sampling methods, we calculated the mean
genetic ancestry weighted by the number of individuals. The weighted mean
proportions of European, African, and Native American ancestries were 68.1%,
19.6%, and 11.6%, respectively. At the regional level, the highest European
contribution occurred in the South, while the highest African and Native
American contributions occurred in the Northeastern and Northern regions,
respectively. Among states in the Northeast region, Bahia and Ceará showed
significant differences, suggesting distinct demographic histories. This review
contributes for a broader understanding of the Brazilian ancestry and indicates
that the ancestry estimates are influenced by the type of molecular marker and
the sampling method.
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Affiliation(s)
- Aracele Maria de Souza
- Research Group in Molecular Biology and Immunology of Malaria, Instituto René Rachou, Fiocruz, Belo Horizonte, MG, Brazil
| | - Sarah Stela Resende
- Research Group in Molecular Biology and Immunology of Malaria, Instituto René Rachou, Fiocruz, Belo Horizonte, MG, Brazil
| | - Taís Nóbrega de Sousa
- Research Group in Molecular Biology and Immunology of Malaria, Instituto René Rachou, Fiocruz, Belo Horizonte, MG, Brazil
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Araujo LF, Molfetta GA, Vincenzi OC, Huber J, Teixeira LA, Ferraz VE, Silva WA. Molecular basis of familial adenomatous polyposis in the southeast of Brazil: identification of six novel mutations. Int J Biol Markers 2019; 34:80-89. [PMID: 30852976 DOI: 10.1177/1724600818814462] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
BACKGROUND The goal of this study was to screen point mutations and deletions in APC and MUTYH genes in patients suspected of familial adenomatous polyposis (FAP) in a Brazilian cohort. METHODS We used high-resolution melting, Sanger direct sequencing and multiplex ligation-dependent probe association (MLPA) assays to identify point mutations, and large genomic variations within the coding regions of APC and MUTYH genes. RESULTS We identified 19 causative mutations in 40 Brazilian patients from 20 different families. Four novel mutations were identified in the APC gene and two in the MUTYH gene. We also found a high intra- and inter-familial diversity regarding extracolonic manifestations, and gastric polyps were the most common manifestation found in our cohort. CONCLUSION We believe that the FAP mutational spectrum can be population-specific and screening FAP patients in different populations can improve pre-clinical diagnosis and improve clinical conduct.
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Affiliation(s)
- Luiza Ferreira Araujo
- 1 Departament of Genetics, Ribeirão Preto Medical School, University of São Paulo, Brazil.,3 Center for Cell-Based Therapy CEPID/FAPESP, and Regional Blood Center of Ribeirão Preto, Brazil.,5 Medical Genomics Laboratory, AC Camargo Cancer Center, Brazil
| | - Greice Andreotti Molfetta
- 1 Departament of Genetics, Ribeirão Preto Medical School, University of São Paulo, Brazil.,2 Center for Medical Genomics at Clinical Hospital of the Ribeirão Preto Medical School, University of São Paulo, Brazil.,3 Center for Cell-Based Therapy CEPID/FAPESP, and Regional Blood Center of Ribeirão Preto, Brazil
| | - Otavio Costa Vincenzi
- 2 Center for Medical Genomics at Clinical Hospital of the Ribeirão Preto Medical School, University of São Paulo, Brazil.,3 Center for Cell-Based Therapy CEPID/FAPESP, and Regional Blood Center of Ribeirão Preto, Brazil.,4 Medical Genetics Unit, Clinical Hospital of the Medical School of Ribeirão Preto, University of São Paulo, Brazil
| | - Jair Huber
- 4 Medical Genetics Unit, Clinical Hospital of the Medical School of Ribeirão Preto, University of São Paulo, Brazil
| | - Lorena Alves Teixeira
- 4 Medical Genetics Unit, Clinical Hospital of the Medical School of Ribeirão Preto, University of São Paulo, Brazil
| | - Victor Evangelista Ferraz
- 1 Departament of Genetics, Ribeirão Preto Medical School, University of São Paulo, Brazil.,2 Center for Medical Genomics at Clinical Hospital of the Ribeirão Preto Medical School, University of São Paulo, Brazil.,4 Medical Genetics Unit, Clinical Hospital of the Medical School of Ribeirão Preto, University of São Paulo, Brazil
| | - Wilson Araujo Silva
- 1 Departament of Genetics, Ribeirão Preto Medical School, University of São Paulo, Brazil.,2 Center for Medical Genomics at Clinical Hospital of the Ribeirão Preto Medical School, University of São Paulo, Brazil.,3 Center for Cell-Based Therapy CEPID/FAPESP, and Regional Blood Center of Ribeirão Preto, Brazil.,4 Medical Genetics Unit, Clinical Hospital of the Medical School of Ribeirão Preto, University of São Paulo, Brazil
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Ramos BRDA, D'Elia MPB, Amador MAT, Santos NPC, Santos SEB, da Cruz Castelli E, Witkin SS, Miot HA, Miot LDB, da Silva MG. Neither self-reported ethnicity nor declared family origin are reliable indicators of genomic ancestry. Genetica 2016; 144:259-65. [PMID: 26984822 DOI: 10.1007/s10709-016-9894-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 03/13/2016] [Indexed: 12/11/2022]
Abstract
Ancestry information can be useful in investigations of diseases with a genetic or infectious background. As the Brazilian population is highly admixed physical traits tend to be poor indicators of ancestry. The assessment of ancestry by ancestry informative markers (AIMs) can exclude the subjectivity of self-declared ethnicity and reported family origin. We aimed to evaluate the reliability of self-reported ethnicity or reported family origin as indicators of genomic ancestry in a female population from the Southeast of Brazil. Two cohorts were included: 404 women asked to self-report their ethnicity (Pop1) and 234 women asked to report their family's origin (Pop2). Identification of AIMs was performed using a panel of 61 markers and results were plotted against parental populations-Amerindian, Western European and Sub-Saharan African-using Structure v2.3.4. In Pop1 57.4 % of women self-reported as white, 34.6 % as brown and 8.0 % as black. Median global European, Amerindian and African contributions were 66.8, 12.6 and 16.6 %. In Pop2, 66.4 % of women declared European origin, 23.9 % African origin and 26.9 % Amerindian. Median global European, Amerindian and African contributions were 80.8, 7.3 and 7.6 %, respectively. Only 31.0 and 21.0 % of the global variation in African and European contributions, respectively, could be explained by self-reported ethnicity and reported family origin only accounted for 20.0 and 5.0 % of the variations observed in African and European ancestries, respectively. Amerindian ancestry did not influence self-reported ethnicity or declared family origin. Neither self-reported ethnicity nor declared family origin are reliable indicators of genomic ancestry in these Brazilian populations.
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Affiliation(s)
- Bruna Ribeiro de Andrade Ramos
- Department of Pathology, Botucatu Medical School, São Paulo State University - UNESP, Distrito de Rubião Júnior, Botucatu, São Paulo, 18618-970, Brazil
| | - Maria Paula Barbieri D'Elia
- Depatment of Dermatology and Radiotherapy, Botucatu Medical School, São Paulo State University - UNESP, Botucatu, São Paulo, Brazil
| | | | | | | | - Erick da Cruz Castelli
- Department of Pathology, Botucatu Medical School, São Paulo State University - UNESP, Distrito de Rubião Júnior, Botucatu, São Paulo, 18618-970, Brazil
| | - Steven S Witkin
- Department of Obstetrics and Gynecology, Weill Cornell Medical College, New York, NY, USA
| | - Hélio Amante Miot
- Depatment of Dermatology and Radiotherapy, Botucatu Medical School, São Paulo State University - UNESP, Botucatu, São Paulo, Brazil
| | - Luciane Donida Bartoli Miot
- Depatment of Dermatology and Radiotherapy, Botucatu Medical School, São Paulo State University - UNESP, Botucatu, São Paulo, Brazil
| | - Márcia Guimarães da Silva
- Department of Pathology, Botucatu Medical School, São Paulo State University - UNESP, Distrito de Rubião Júnior, Botucatu, São Paulo, 18618-970, Brazil.
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Kellner AW. Ethnic ancestry and smoking, farming of wine grapes in semiarid regions, and the potentials of Manihot multifida in medicine use. AN ACAD BRAS CIENC 2015; 87:1-2. [DOI: 10.1590/0001-37652015871] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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