Hb Nile[A1] and Hb Nile[A2]: novel identical [alpha77(EF6)Pro-->Ser] variants found in either the alpha1- or alpha2-globin genes.

We describe a novel hemoglobin (Hb) variant, caused by a CCC > TCC transition at codon 77 on the alpha gene. The mutation was found in two unrelated patients, in one patient on the alpha1 gene and in the other patient on the alpha2 gene. Both are anemic patients of African origin.