Greenlandic Inuit show genetic signatures of diet and climate adaptation

The indigenous people of Greenland, the Inuit, have lived for a long time in the extreme conditions of the Arctic, including low annual temperatures, and with a specialized diet rich in protein and fatty acids, particularly omega-3 polyunsaturated fatty acids (PUFAs). A scan of Inuit genomes for sig...

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Bibliographic Details
Published in:Science
Main Authors: Fumagalli, Matteo, Moltke, Ida, Grarup, Niels, Racimo, Fernando, Bjerregaard, Peter, Jørgensen, Marit E, Korneliussen, Thorfinn S, Gerbault, Pascale, Skotte, Line, Linneberg, Allan, Christensen, Cramer, Brandslund, Ivan, Jørgensen, Torben, Huerta-Sánchez, Emilia, Schmidt, Erik B, Pedersen, Oluf, Hansen, Torben, Albrechtsen, Anders, Nielsen, Rasmus
Format: Article in Journal/Newspaper
Language:English
Published: 2015
Subjects:
Greenland
greenlandic
inuit
Online Access:https://vbn.aau.dk/da/publications/4d287052-0668-4576-b696-83df3556ff0e
https://doi.org/10.1126/science.aab2319
Description
Summary:The indigenous people of Greenland, the Inuit, have lived for a long time in the extreme conditions of the Arctic, including low annual temperatures, and with a specialized diet rich in protein and fatty acids, particularly omega-3 polyunsaturated fatty acids (PUFAs). A scan of Inuit genomes for signatures of adaptation revealed signals at several loci, with the strongest signal located in a cluster of fatty acid desaturases that determine PUFA levels. The selected alleles are associated with multiple metabolic and anthropometric phenotypes and have large effect sizes for weight and height, with the effect on height replicated in Europeans. By analyzing membrane lipids, we found that the selected alleles modulate fatty acid composition, which may affect the regulation of growth hormones. Thus, the Inuit have genetic and physiological adaptations to a diet rich in PUFAs.

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