Genetics, surnames, grandparents' nationalities, and ethnic admixture in Southern Brazil: Do the patterns of variation coincide?

A total of 2,708 individuals from the European-derived population of Rio Grande do Sul, divided into seven mesoregions, and of 226 individuals of similar origin from Santa Catarina were studied. Seventeen protein genetic systems, as well as grandparents' nationalities, individuals' surname...

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Bibliographic Details
Published in:Genetics and molecular biology Vol. 22; no. 2; pp. 151 - 161
Main Authors: Dornelles, C.L., Callegari-Jacques, S.M., Robinson, W.M., Weimer, T.A., Franco, M.H.L.P., Hickmann, A.C., Geiger, C.J., Salzano, F.M.
Format: Journal Article
Language:English
Published: Sociedade Brasileira de Genética 01-06-1999
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Summary:A total of 2,708 individuals from the European-derived population of Rio Grande do Sul, divided into seven mesoregions, and of 226 individuals of similar origin from Santa Catarina were studied. Seventeen protein genetic systems, as well as grandparents' nationalities, individuals' surnames, and interethnic admixture were investigated. The alleles which presented the highest and lowest differences were GLO1*2 (16%) and PGD*A (2%), respectively, but in general no significant genetic differences were found among mesoregions. The values observed were generally those expected for individuals of European descent, with the largest difference being a lower prevalence (34-39%) of P*1. Significant heterogeneity among mesoregions was observed for the other variables considered, and was consistent with historical records. The Amerindian contribution to the gene pool of European-derived subjects in Rio Grande do Sul was estimated to be as high as 11%. Based on the four data sets, the most general finding was a tendency for a northeast-southwest separation of the populations studied. Seven significant phenotype associations between systems were observed at the 5% level (three at the 0.1% level). Of the latter, the two most interesting (since they were also observed in other studies) were MNSs/Duffy and Rh/ACP. Uma amostra de 2.708 descendentes de europeus que vivem no Rio Grande do Sul, o qual foi subdividido em sete mesorregiões, e de 226 pessoas da mesma procedência provenientes de Santa Catarina foi estudada quanto a 17 sistemas genéticos protéicos, nacionalidades dos avós, sobrenomes dos indivíduos e mistura interétnica. Não foram encontradas diferenças significantes entre as mesorregiões, os alelos que apresentaram a maior e a menor diferença sendo GLO1*2 (16%) e PGD*A (2%), respectivamente. Os valores observados foram os esperados para descendentes de europeus, a maior diferença sendo uma menor prevalência do alelo P*1 (34-39%). Por outro lado, foi encontrada heterogeneidade significante entre mesorregiões em relação às outras variáveis consideradas, a qual foi consistente com dados históricos. A contribuição ameríndia estimada para o conjunto gênico de descendentes de europeus da população do Rio Grande do Sul foi tão alta quanto 11%. O resultado mais geral obtido, considerando os quatro conjuntos de dados, foi o de uma tendência de divisão nordeste-sudoeste para as populações estudadas. Sete associações fenotípicas significativas entre sistemas foram obtidas a nível de 5% (três a nível de 0.1%). Duas destas foram também observadas por outros autores: MNSs/Duffy e Rh/ACP.
ISSN:1415-4757
1678-4685
1415-4757
DOI:10.1590/S1415-47571999000200003