Wang et al., publishing in PLoS Genetics, looked at the genetic diversity in Native American populations from Canada all the way down into South America. They wanted to see whether the genetic diversity observed in Native peoples correlated in any way with...

Wang et al in PloS Genetics:We examined genetic diversity and population structure in the American landmass using 678 autosomal microsatellite markers genotyped in 422 individuals representing 24 Native American populations sampled from North, Central, and...

This is a pretty impressive study. They analyzed "678 autosomal microsatellite markers genotyped in 422 individuals" spread across the Americas. They also compare it to the CEPH panel of worldwide populationsInterestingly, or ironically, there are no samples...

See Figure 7 for evidence of the substructure within the Native American race. PLoS Genetics Vol. 3, No. 11, e185 doi:10.1371/journal.pgen.0030185 Genetic Variation and Population Structure in Native Americans Sijia Wang et al. We examined genetic diversity...

Invisible Pink Unicorn writes "One of the most comprehensive analyses of genetic variation ever undertaken supports the theory that the ancestors of modern native peoples throughout the Americas came from a single source in East Asia across a northwest land...

PLoS Genetics has a new paper (PLoS Genet 3(11): e185. doi:10.1371/journal.pgen.0030185) that examines autosomal microsatellite markers (repeating units of base pairs) from Native American DNA:“We examined genetic diversity and population structure in...