North Greenland Polar Eskimos are the only hunter-gatherer population, to our knowledge, who can offer precise genealogical records spanning several generations http://www.ncbi.nlm.nih.gov/pubmed/18364314
"Arctic gene" makes fasting dangerous for Inuit. Consequences can be grave for infants who go without food longer than overnight. Thousands of years of a diet with lots of animal fats and sparse carbohydrates left a mark on the DNA of Native people of the Far North, a genetic condition that slows the body’s ability to burn fat for energy. The trait affects people in Greenland and Russia too. It may be advantageous in some circumstances.
The Inuit are a group of culturally similar indigenous peoples inhabiting the Arctic regions of Canada (Northwest Territories, Nunatsiavut, Nunavik, Nunavut, Nunatukavut), Denmark (Greenland), Russia (Siberia) and the United States (Alaska). Inuit means “the people” in the Inuktitut language. An Inuk is singular for Inuit person, whereas Inuit is plural. The Inuit language is grouped under Eskimo–Aleut languages
Native American Nations and 360 Degree Migration Around the Arctic Circle