近日巴西米纳斯吉拉斯联邦大学一份调查显示，热情的巴西人有近六成的民众都含有欧洲人基因，是世界上最接近欧洲族群的种族。
因为黝黑皮肤和热情奔放的生活态度，巴西人一向被认为应该与非洲人的基因较相近，不过根据研究报导指出，虽然巴西人的肤色较黑，却拥有与欧洲人较相似的基因。
巴西多数人皆拥有欧洲人基因，其中东北部有60.6%的比例，南部更是高达77.7%。而会有这样的状况，主要是因为巴西于19世界末「欧洲化」，随着黑奴的解放，有超过600万名的欧洲劳工移民巴西，并在此生根并与当地的原住民、非洲人结婚生子，才会让巴西人拥有与欧洲人相似的基因。
据遗传学专家潘纳（Sergio Pena）表示，这项研究结果可能对于人类学和巴西历史产生重大的冲击，不过站在医学的角度来看，这样的相似基因，也可以做为巴西人治疗同样性的基础。（生物谷Bioon.com）
生物谷推荐原文出处：
PLoS ONE 6(2): e17063. doi:10.1371/journal.pone.0017063
The Genomic Ancestry of Individuals from Different Geographical Regions of Brazil Is More Uniform Than Expected
Sérgio D. J. Pena1*, Giuliano Di Pietro2, Mateus Fuchshuber-Moraes3, Julia Pasqualini Genro4, Mara H. Hutz4, Fernanda de Souza Gomes Kehdy1, Fabiana Kohlrausch3, Luiz Alexandre Viana Magno5, Raquel Carvalho Montenegro6, Manoel Odorico Moraes6, Maria Elisabete Amaral de Moraes6, Milene Raiol de Moraes7, élida B. Ojopi8, Jamila A. Perini3, Clarice Racciopi1, ?ndrea Kely Campos Ribeiro-dos-Santos7, Fabrício Rios-Santos2, Marco A. Romano-Silva5, Vinicius A. Sortica4, Guilherme Suarez-Kurtz3
Abstract
Based on pre-DNA racial/color methodology, clinical and pharmacological trials have traditionally considered the different geographical regions of Brazil as being very heterogeneous. We wished to ascertain how such diversity of regional color categories correlated with ancestry. Using a panel of 40 validated ancestry-informative insertion-deletion DNA polymorphisms we estimated individually the European, African and Amerindian ancestry components of 934 self-categorized White, Brown or Black Brazilians from the four most populous regions of the Country. We unraveled great ancestral diversity between and within the different regions. Especially, color categories in the northern part of Brazil diverged significantly in their ancestry proportions from their counterparts in the southern part of the Country, indicating that diverse regional semantics were being used in the self-classification as White, Brown or Black. To circumvent these regional subjective differences in color perception, we estimated the general ancestry proportions of each of the four regions in a form independent of color considerations. For that, we multiplied the proportions of a given ancestry in a given color category by the official census information about the proportion of that color category in the specific region, to arrive at a “total ancestry” estimate. Once such a calculation was performed, there emerged a much higher level of uniformity than previously expected. In all regions studied, the European ancestry was predominant, with proportions ranging from 60.6% in the Northeast to 77.7% in the South. We propose that the immigration of six million Europeans to Brazil in the 19th and 20th centuries - a phenomenon described and intended as the “whitening of Brazil” - is in large part responsible for dissipating previous ancestry dissimilarities that reflected region-specific population histories. These findings, of both clinical and sociological importance for Brazil, should also be relevant to other countries with ancestrally admixed populations.
