A genetic study published in
Science in August 2014 examined the remains of six Saqqaq individuals buried in Qeqertasussuk, Greenland between ca. 3000 BCE and 1900 BCE. The five samples of
mitochondrial DNA (mtDNA) extracted belonged to haplogroups
D2a1 (four samples) and D2a. These
haplogroups also predominate in the
Dorset culture, and are today found in high frequencies among the
Siberian Yupik and
Aleuts, with whom the Saqqaq are relatively closely related. The evidence suggested that the ancestors of the Saqqaq entered North America from Siberia through a distinct migration about 4000 BC, and that they subsequently remained largely genetically isolated from other North American populations. == See also ==