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The Gm polymorphism and racial admixture in six Amazonian populations

1984; Elsevier BV; Volume: 13; Issue: 6 Linguagem: Inglês

10.1016/s0047-2484(84)80005-6

1095-8606

María Lucía, Hendrik Hamel, Francisco M. Salzano, Maria J. de Melo e Freitas,

Race, Genetics, and Society

A total of 731 individuals, from three Indian and three trihybrid (White/Black/Indian) communities were studied in relation to seven Gm specificities. The frequencies in two of the Amerindian populations (Içana river Indians and Sateré-Mawé) agree well with those reported in the literature. The Pacaás Novos, however, showed the lowest Gm1;21 (0·41) and the highest Gm1,2;21 (0·59) prevalences observed so far in unmixed populations of this ethnic group. Reviewing the data in 41 South American tribes disclosed in the continent a southern area of low and a northern area of high prevalences of Gm1,2;21. The frequency of this marker showed a significant correlation (−0·72) with the linguistic classification of the tribes studied. Marked heterogeneity was observed in the Gm haplotype distribution found in the three trihybrid populations. quantitative estimates of admixture indicated that the Black component is the least important and is relatively constant (13%–14%). The Indian fraction is larger than the White one in Parintins (51% vs 36%), the opposite occurring in Manaus (Indian: 29%; White: 58%); in Coari the contribution of these two ethnic groups seems to be equal (43%). Three unrelated individuals from Coari showed a rare phenotype, with Gm(2) but not Gm(21), seldomly found in Europeans, Africans or Amerindians.