The impact of modern migrations on present-day multi-ethnic Argentina as recorded on the mitochondrial DNA genome

BMC Genetics

Research Article

María Laura Catelli¹  Carola Romanini¹  Carlos Vullo²  Alicia Borosky³  Antonio Salas⁴  Ana Mosquera-Miguel⁴  Ángel Carracedo⁴  Alberto Gómez-Carballa⁴  Jorge Amigo⁴  Vanesa Álvarez-Iglesias⁴ 

[1] Equipo Argentino de Antropología Forense, Independencia 644 - 5C, Edif. EME1, Córdoba, Argentina;Equipo Argentino de Antropología Forense, Independencia 644 - 5C, Edif. EME1, Córdoba, Argentina;Laboratorio de Inmunogenética y Diagnóstico Molecular, Independencia 644 - 4, Edif EME1, Córdoba, Argentina;Laboratorio de Inmunogenética y Diagnóstico Molecular, Independencia 644 - 4, Edif EME1, Córdoba, Argentina;Unidade de Xenética, Instituto de Medicina Legal and Departamento de Anatomía Patolóxica e Ciencias Forenses, Calle San Francisco sn, Facultade de Medicina, Universidade de Santiago de Compostela, CIBERER, 15782, Santiago de Compostela, Galicia, Spain;

关键词: Haplotype Sharing;    Admix Population;    Admixture Analysis;    European Immigrant;    African Slave;   

DOI  :  10.1186/1471-2156-12-77

 received in 2011-02-03, accepted in 2011-08-30,  发布年份 2011

来源: Springer

【 摘 要 】

BackgroundThe genetic background of Argentineans is a mosaic of different continental ancestries. From colonial to present times, the genetic contribution of Europeans and sub-Saharan Africans has superposed to or replaced the indigenous genetic 'stratum'. A sample of 384 individuals representing different Argentinean provinces was collected and genotyped for the first and the second mitochondrial DNA (mtDNA) hypervariable regions, and selectively genotyped for mtDNA SNPs. This data was analyzed together with additional 440 profiles from rural and urban populations plus 304 from Native American Argentineans, all available from the literature. A worldwide database was used for phylogeographic inferences, inter-population comparisons, and admixture analysis. Samples identified as belonging to hg (hg) H2a5 were sequenced for the entire mtDNA genome.ResultsPhylogenetic and admixture analyses indicate that only half of the Native American component in urban Argentineans might be attributed to the legacy of extinct ancestral Argentineans and that the Spanish genetic contribution is slightly higher than the Italian one. Entire H2a5 genomes linked these Argentinean mtDNAs to the Basque Country and improved the phylogeny of this Basque autochthonous clade. The fingerprint of African slaves in urban Argentinean mtDNAs was low and it can be phylogeographically attributed predominantly to western African. The European component is significantly more prevalent in the Buenos Aires province, the main gate of entrance for Atlantic immigration to Argentina, while the Native American component is larger in North and South Argentina. AMOVA, Principal Component Analysis and hgs/haplotype patterns in Argentina revealed an important level of genetic sub-structure in the country.ConclusionsStudies aimed to compare mtDNA frequency profiles from different Argentinean geographical regions (e.g., forensic and case-control studies) should take into account the important genetic heterogeneity of the country in order to prevent false positive claims of association in disease studies or inadequate evaluation of forensic evidence.

【 授权许可】

Unknown   
© Catelli et al; licensee BioMed Central Ltd. 2011. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.