title: Demographic expansions in South America: enlightening a complex scenario with genetic and linguistic data.
abstract: Native Americans are characterized by specific and unique patterns of genetic and cultural/linguistic diversities, and this information has been used to understand patterns of geographic dispersion, and the relationship between these peoples. Particularly interesting are the Tupi and Je speaker dispersions. At present, a large number of individuals speak languages of these two stocks; for instance, Tupi-Guarani is one of the official languages in Paraguay, Bolivia, and the Mercosul economic block. Although the Tupi expansion can be compared in importance to the Bantu migration in Africa, little is known about this event relative to others. Equal and even deeper gaps exist concerning the Je-speakers' expansion. This study aims to elucidate some aspects of these successful expansions. To meet this purpose, we analyzed Native American mtDNA complete control region from nine different populations and included HVS-I sequences available in the literature, resulting in a total of 1,176 samples investigated. Evolutionary relationships were explored through median-joining networks and genetic/geographic/linguistic correlations with Mantel tests and spatial autocorrelation analyses. Both Tupi and Je showed general traces of ancient or more recent fission-fusion processes, but a very different pattern of demographic expansion. Tupi populations displayed a classical isolation-by-distance pattern, while Je groups presented an intricate and nonlinear mode of dispersion. We suggest that the collective memory and other cultural processes could be important factors influencing the fission-fusion events, which likely contributed to the genetic structure, evolution, and dispersion of Native American populations.
authors: Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Caixa Postal 15053, 91501-970, Porto Alegre, RS, Brazil.
authors: Virginia
authors: V
authors: Ramallo
authors: Rafael
authors: R
authors: Bisso-Machado
authors: Claudio
authors: C
authors: Bravi
authors: Michael D
authors: MD
authors: Coble
authors: Francisco M
authors: FM
authors: Salzano
authors: Tábita
authors: T
authors: Hünemeier
authors: Maria Cátira
authors: MC
authors: Bortolini
mesh_terms: D000885:Anthropology, Physical; D004272:DNA, Mitochondrial / Q000737:chemistry; D019143:Evolution, Molecular; D005260:Female; D014644:Genetic Variation; D005828:Genetics, Population / Q000379:methods*; D006801:Humans; D007199:Indians, South American / Q000208:ethnology* / Q000235:genetics*; D007802:Language; D008297:Male; D016415:Sequence Alignment; D013020:South America
chemical_list: D004272:DNA, Mitochondrial