Abstract
There are at least four distinct African and one Asian chromosomal backgrounds (haplotypes) on which the sickle cell mutation has arisen. Additionally, previous data suggest that the beta(S)/Bantu haplotype is heterogeneous at the molecular level. Here, we report the presence of the (A)gamma -499 T-->A variation in sickle cell anemia chromosomes of Sicilian and North African origin bearing the beta(S)/Benin haplotype. Being absent from North American beta(S)/Benin chromosomes, which were studied previously, this variation is indicative for the molecular heterogeneity of the beta(S)/Benin haplotype.
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