PMID: 49052Jun 1, 1975Paper

Group-specific component (Gc) proteins bind vitamin D and 25-hydroxyvitamin D

Proceedings of the National Academy of Sciences of the United States of America
S P DaigerL L Cavalli-Sforza

Abstract

Group-specific component (Gc) proteins are human plasma proteins for which a worldwide polymorphism exists. As yet no functional role has been assigned this protein. We show that the products of both Gc alleles, proteins Gc 1 and Gc 2 (distinguished electrophoretically), bind substantial quantities of vitamin D and 25-hydroxyvitamin D. Three lines of evidence are reported: (1) Polyacrylamide gel electrophoresis and autoradiography of serum labeled with (14-C)vitamin D3 revealed patterns of radioactive bands identical to those expected of the two Gc alleles. Population gene frequencies for these proteins binding vitamin D were in the range of those reported for Gc, and individuals of known Gc phenotype were found to have the corresponding vitamin-D-binding phenotype. (2) Immunoelectrophoresis and autoradiography of labeled serum reacted against antiserum to human Gc revealed labeling by (14-C)vitamin D3 of Gc-antibody precipitation ares. (3) (14-C)vitamin D3 or 25-hydroxy(3-H)vitamin D3 was found to coprecipitate specifically with Gc in serum incubated with Gc antiserum. Use of these techniques demonstrated further that plasma proteins that bind vitamin D and that are immunologically similar to human Gc are found in mouse, rat, ...Continue Reading

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