On the use of Chinese population as a proxy of Amerindian ancestors in genetic admixture studies with Latin American populations

We read the recent article of Magalh\ue3es da Silva et al1 reporting the correlation between biogeographic ancestries, estimated using 30 ancestry informative markers(AIMs), and self-reported skin color in two different Brazilian Northeastern populations (Fortaleza and Salvador, capitals of the states of Cear\ue1 and Bahia, respectively). The authors observed that African ancestry is more correlated in the sample from Salvador than in the one from Fortaleza and that the use of different African populations as proxies of the Brazilian\u2019s African ancestors may influence the results