INCUAPA   23990
INVESTIGACIONES ARQUEOLOGICAS Y PALEONTOLOGICAS DEL CUATERNARIO PAMPEANO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Ancient human mitochondrial (mtDNA). Analysis form the Pampean region of Argentina. New results and perspectives.
Autor/es:
FEHREN-SCHMITZ, LARS; SCHEIFLER, NAHUEL A.; MESSINEO, PABLO G.; GONZÁLEZ, MARIELA E.; POLITIS, GUSTAVO; SCABUZZO, CLARA
Lugar:
Necochea
Reunión:
Congreso; IX Simposio Internacional el Hombre Temprano en America. La Gente y sus Lugares. Simposio; 2018
Resumen:
Archaeological excavations of three open-air sites in the Pampean plains of Argentina revealed large numbers of human burials for the Early and Middle Holocene. The analysis of ancient mitochondrial DNA from these human remains generated new results about the peopling of the Americas and provided new insight about population dynamic in this region. At the Arroyo Seco 2 site 50 individuals (and counting), dated between 7819 ± 61 14C yrs BP and 4487 ± 45 14C yrs BP were recovered (n = 26 dates). We obtained 13 full mitochondrial genomes from those. In Laguna Chica three humans skeletons were dated between 6080 ± 15 14C yrs BP and 5930 ± 15 14C yrs BP and (n = 2 dates). A forth skeleton produces a more recent age (1750 14C yrs BP). Among them, we generated three full mitochondrial genomes for the Middle Holocene. Finally, at the Laguna de los Pampas site, 6 skeletons were dated between 8971 ± 77 and 5688 ± 36 14C yrs BP (n = 6 dates). We were able to obtain the full mitogenome of the older dating individual (Burial 1, Individual 1). In this presentation, we compared the mitochondrial genomes from the three sites to existing ancient and modern mitochondrial genomes from South America to reconstruct the phylogenies of the Native American founding lineages and to date the divergence of Southern Cone specific haplotypes. We find long standing genetic continuity in the Pampa region, with some of the Early and Middle Holocene mitochondrial lineages being basal to lineages found in modern and historic populations of the Pampas and Patagonia. We further determine divergence ages of ~11k years for the Southern Cone specific lineages D1j and D1g, confirming that those lineages evolved shortly after the first people arrived in the Pampas and further south.