Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Genetic signature of natural selection in first Americans

Texto completo
Autor(es):
Amorim, Carlos Eduardo G. ; Nunes, Kelly ; Meyer, Diogo ; Comas, David ; Bortolini, Maria Catira ; Salzano, Francisco Mauro ; Hunemeier, Tabita
Número total de Autores: 7
Tipo de documento: Artigo Científico
Fonte: Proceedings of the National Academy of Sciences of the United States of America; v. 114, n. 9, p. 2195-2199, FEB 28 2017.
Citações Web of Science: 15
Resumo

When humans moved from Asia toward the Americas over 18,000 y ago and eventually peopled the New World they encountered a new environment with extreme climate conditions and distinct dietary resources. These environmental and dietary pressures may have led to instances of genetic adaptation with the potential to influence the phenotypic variation in extant Native American populations. An example of such an event is the evolution of the fatty acid desaturases (FADS) genes, which have been claimed to harbor signals of positive selection in Inuit populations due to adaptation to the cold Greenland Arctic climate and to a proteinrich diet. Because there was evidence of intercontinental variation in this genetic region, with indications of positive selection for its variants, we decided to compare the Inuit findings with other Native American data. Here, we use several lines of evidence to show that the signal of FADS-positive selection is not restricted to the Arctic but instead is broadly observed throughout the Americas. The shared signature of selection among populations living in such a diverse range of environments is likely due to a single and strong instance of local adaptation that took place in the common ancestral population before their entrance into the New World. These first Americans peopled the whole continent and spread this adaptive variant across a diverse set of environments. (AU)

Processo FAPESP: 12/09950-9 - Evolução de genes HLA: diferenciação populacional e sinais de seleção recente em populações nativas e miscigenadas do Brasil
Beneficiário:Kelly Nunes
Linha de fomento: Bolsas no Brasil - Pós-Doutorado