Abstract
Before the arrival of Spanish settlers, the East region of Paraguay, was inhabited by Guarani people. After the Paraguayan war in 1870, which ended in loss of a high percentage of the male population, the migration to the country was encouraged. Immigration data indicate a high input of Eurasians to the territory. Also, since 1960s, a large number of Brazilians and Argentineans arrived in Paraguay. Samples from the eastern provinces of Paraguay were sequenced for the mtDNA control region and 88% presented native American haplogroups. A preliminary study on the same samples using AIMs indicates a high autosomal contribution from Europe and native America. The comparison of both type of markers showed that the European ancestry for autosomes is higher than expected when averaging mtDNA and the Y chromosome. This result supports recent admixture between Paraguayans and other populations probably already admixed, where the men contributed with high European ancestry.
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