Disentangling Signatures of Selection Before and After European Colonization in Latin Americans

作者：Javier Mendoza‐Revilla, Juan Camilo Chacón-Duque, Macarena Fuentes‐Guajardo, Louise Ormond, Ke Wang, Malena Hurtado, Valeria Villegas, Vanessa Granja, Víctor Acuña-Alonzo, Claudia Jaramillo, William Arias, Rodrigo Barquera, Jorge Gómez‐Valdés, Hugo Villamil‐Ramírez, Caio César Silva de Cerqueira, Keyla M. Badillo Rivera, María A. Nieves-Colón, Christopher R. Gignoux, Genevieve L. Wojcik, Andrés Moreno‐Estrada, Tábita Hünemeier, Virgínia Ramallo, Lavínia Schüler‐Faccini, Rolando González‐José, María Cátira Bortolini, Samuel Canizales‐Quinteros, Carla Gallo, Giovanni Poletti, Gabriel Bedoya, Francisco Rothhammer, David J. Balding, Matteo Fumagalli, Kaustubh Adhikari, Andrés Ruiz‐Linares, Garrett Hellenthal · 发表于：Molecular Biology and Evolution · 年份：2022 · DOI：10.1093/molbev/msac076 · 被引用次数：34 · 研究领域：Race, History, and American Society、Culture, Economy, and Development Studies

Throughout human evolutionary history, large-scale migrations have led to intermixing (i.e., admixture) between previously separated human groups. Although classical and recent work have shown that studying admixture can yield novel historical insights, the extent to which this process contributed to adaptation remains underexplored. Here, we introduce a novel statistical model, specific to admixed populations, that identifies loci under selection while determining whether the selection likely occurred post-admixture or prior to admixture in one of the ancestral source populations. Through extensive simulations, we show that this method is able to detect selection, even in recently formed admixed populations, and to accurately differentiate between selection occurring in the ancestral or admixed population. We apply this method to genome-wide SNP data of ∼4,000 individuals in five admixed Latin American cohorts from Brazil, Chile, Colombia, Mexico, and Peru. Our approach replicates previous reports of selection in the human leukocyte antigen region that are consistent with selection post-admixture. We also report novel signals of selection in genomic regions spanning 47 genes, reinforcing many of these signals with an alternative, commonly used local-ancestry-inference approach. These signals include several genes involved in immunity, which may reflect responses to endemic pathogens of the Americas and to the challenge of infectious disease brought by European contact. In ad...