Hemoglobin Genotype S/C-Harlem
Compound heterozygous inheritance of Hb S and Hb C-Harlem mutations. Hb S occurs from substitution of valine for glutamic acid in the beta-6 position (beta6Glu>Val). Hb C-Harlem involves two substitutions in each beta-chain: the first being identical to that found in Hb S, and the second being a substitution of aspartic acid at position 73 by asparagine (beta73Asp>Asn).