Phenotype and allele frequencies for erythrocyte glutathione peroxidase (GPX1) polymorphism are reported in the Mbugu and Sango (Central African Republic), Goun (Benin), and Bamileke (Cameroon) ethnic groups. The GPX1*2 allele frequencies (from 0.012 in the Sango to 0.058 in the Bamileke) fit into the range of the data already known for the Subsaharan populations. The value of GPX1*2 for study of the genetic admixture between Negro and Pygmy populations is suggested. Three different unusual GPX1 electrotypes are described. Finally, we hypothesize an interaction between GPX1*2 and Hb beta*S allelic products occurring in the sickle cells infected by Plasmodium falciparum.
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