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Subtyping of transferrin by isoelectric focusing in immobilized pH gradients

Isoelectric focusing in immobilized pH gradients ranging from pH 5.05 to 5.60 was used to study the distribution of transferrin (Tf) subtypes and their gene frequencies from 188 unrelated healthy donors of the Han population in Beijing. Six phenotypes (TfCl, TfC2, TfC1C2, TfC1C3, TfC1Dchi and TfC2Dchi) were detected and Tf*C3 has never before been reported in the Han population. Gene frequencies were as follows: Tf*Cl = 0.7420, Tf*C2 = 0.2420, Tf*C3 = 0.0027, Tf*Dchi = 0.0133. There is good agreement between the observed and expected values corresponding to the Hardy‐Weinberg equilibrium (∑χ2 = 0.9183, df = 2, 0.5 < P, < 0.75). The allele frequencies for Tf*C1, Tf*C2 and Tf*Dchi agreed with those previously reported for the Chinese Han population.