title: Y-chromosome analysis reveals genetic divergence and new founding native lineages in Athapaskan- and Eskimoan-speaking populations.
abstract: For decades, the peopling of the Americas has been explored through the analysis of uniparentally inherited genetic systems in Native American populations and the comparison of these genetic data with current linguistic groupings. In northern North America, two language families predominate: Eskimo-Aleut and Na-Dene. Although the genetic evidence from nuclear and mtDNA loci suggest that speakers of these language families share a distinct biological origin, this model has not been examined using data from paternally inherited Y chromosomes. To test this hypothesis and elucidate the migration histories of Eskimoan- and Athapaskan-speaking populations, we analyzed Y-chromosomal data from Inuvialuit, Gwich'in, and Tłįch populations living in the Northwest Territories of Canada. Over 100 biallelic markers and 19 chromosome short tandem repeats (STRs) were genotyped to produce a high-resolution dataset of Y chromosomes from these groups. Among these markers is an SNP discovered in the Inuvialuit that differentiates them from other Aboriginal and Native American populations. The data suggest that Canadian Eskimoan- and Athapaskan-speaking populations are genetically distinct from one another and that the formation of these groups was the result of two population expansions that occurred after the initial movement of people into the Americas. In addition, the population history of Athapaskan speakers is complex, with the Tłįch being distinct from other Athapaskan groups. The high-resolution biallelic data also make clear that Y-chromosomal diversity among the first Native Americans was greater than previously recognized.
authors.affiliation: Department of Anthropology, University of Pennsylvania, Philadelphia, PA 19104-6398, USA.
authors.forename: Matthew C
authors.initials: MC
authors.lastname: Dulik
authors.forename: Amanda C
authors.initials: AC
authors.lastname: Owings
authors.forename: Jill B
authors.initials: JB
authors.lastname: Gaieski
authors.forename: Miguel G
authors.initials: MG
authors.lastname: Vilar
authors.forename: Alestine
authors.initials: A
authors.lastname: Andre
authors.forename: Crystal
authors.initials: C
authors.lastname: Lennie
authors.forename: Mary Adele
authors.initials: MA
authors.lastname: Mackenzie
authors.forename: Ingrid
authors.initials: I
authors.lastname: Kritsch
authors.forename: Sharon
authors.initials: S
authors.lastname: Snowshoe
authors.forename: Ruth
authors.initials: R
authors.lastname: Wright
authors.forename: James
authors.initials: J
authors.lastname: Martin
authors.forename: Nancy
authors.initials: N
authors.lastname: Gibson
authors.forename: Thomas D
authors.initials: TD
authors.lastname: Andrews
authors.forename: Theodore G
authors.initials: TG
authors.lastname: Schurr
mesh_terms: D002170:Canada; D002888:Chromosomes, Human, Pair 19 / Q000235:genetics; D041322:Chromosomes, Human, Y / Q000235:genetics*; D004641:Emigration and Immigration; D005787:Gene Frequency; D014644:Genetic Variation; D005828:Genetics, Population / Q000379:methods; D005838:Genotype; D005843:Geography; D006239:Haplotypes / Q000235:genetics; D006801:Humans; D007198:Indians, North American / Q000235:genetics*; D004930:Inuit / Q000235:genetics*; D008297:Male; D018895:Microsatellite Repeats / Q000235:genetics; D009154:Mutation; D059645:Mutation Rate; D010802:Phylogeny; D020641:Polymorphism, Single Nucleotide