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© Research
Publication : Current biology : CB

Genomic Evidence for Local Adaptation of Hunter-Gatherers to the African Rainforest

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Current biology : CB - 08 Aug 2019

Lopez M, Choin J, Sikora M, Siddle K, Harmant C, Costa HA, Silvert M, Mouguiama-Daouda P, Hombert JM, Froment A, Le Bomin S, Perry GH, Barreiro LB, Bustamante CD, Verdu P, Patin E, Quintana-Murci L

Link to Pubmed [PMID] – 31402299

Curr. Biol. 2019 Sep;29(17):2926-2935.e4

African rainforests support exceptionally high biodiversity and host the world’s largest number of active hunter-gatherers [1-3]. The genetic history of African rainforest hunter-gatherers and neighboring farmers is characterized by an ancient divergence more than 100,000 years ago, together with recent population collapses and expansions, respectively [4-12]. While the demographic past of rainforest hunter-gatherers has been deeply characterized, important aspects of their history of genetic adaptation remain unclear. Here, we investigated how these groups have adapted-through classic selective sweeps, polygenic adaptation, and selection since admixture-to the challenging rainforest environments. To do so, we analyzed a combined dataset of 566 high-coverage exomes, including 266 newly generated exomes, from 14 populations of rainforest hunter-gatherers and farmers, together with 40 newly generated, low-coverage genomes. We find evidence for a strong, shared selective sweep among all hunter-gatherer groups in the regulatory region of TRPS1-primarily involved in morphological traits. We detect strong signals of polygenic adaptation for height and life history traits such as reproductive age; however, the latter appear to result from pervasive pleiotropy of height-associated genes. Furthermore, polygenic adaptation signals for functions related to responses of mast cells to allergens and microbes, the IL-2 signaling pathway, and host interactions with viruses support a history of pathogen-driven selection in the rainforest. Finally, we find that genes involved in heart and bone development and immune responses are enriched in both selection signals and local hunter-gatherer ancestry in admixed populations, suggesting that selection has maintained adaptive variation in the face of recent gene flow from farmers.

https://www.ncbi.nlm.nih.gov/pubmed/31402299