Abstract
Applying a combined technology for the detection of allotypec variation of the fourth component of human complement (C4), including immunofixation with anti-C4 and C4-dependent lysis after agarose electrophoresis, sodium dodecyl sulfate-polyacrylamide gel electrophoresis of C4 to separate the C4A and B α-chains, and the determination of Rodgers (Rg) and Chido (Ch) determinants of C4 in serum and at the blotted C4 α-chains, we detected rare human C4 allotypes and studied the genetic linkage. Partial inhibitors (p. i.) of anti-Rg and anti-Ch sera were found; the C4A51 allotype characterized as Rg p. i. and the C4A1 and C4B51 allotypes as Ch p. i. were genetically inherited. The C4A1 allotype has a unique Rg- Ch+ C4A α-chain. Duplicated C4A loci, A *3, A *2, and A *5, A *2 were both associated with a C4BQO and the HLA haplotype A3-Cw4-Bw35-DR1. These additions to the already known extensive C4 polymorphism may help to sort out their significance for the biological functions of human C4.
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Abbreviations
- BF:
-
Factor B polymorphism of the alternative pathway of complement activation
- C2:
-
second component of complement
- C4:
-
fourth component of complement
- C4D:
-
C4-deficient (C4*QO/QO)
- Ch:
-
Chido determinant on C4B* products
- EDTA:
-
ethylendiaminetetraacetic acid
- GLO I:
-
glyoxalase I
- HLA:
-
human leucocyte antigens, A, B, C and DR (D =related) loci
- PAGE:
-
polyacrylamide gel electrophoresis
- PGM3:
-
phosphoglucomutase, third locus
- p. i.:
-
partial inhibitor = serological inhibition of some, but not all anti-Ch and anti-Rg sera at selected dilutions
- SDS:
-
sodium dodecyl sulphate; 94k/96k, 94 000 and 96 000 dalton molecular weight
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Rittner, C., Giles, C.M., Roos, M.H. et al. Genetics of human C4 polymorphism: Detection and segregation of rare and duplicated haplotypes. Immunogenetics 19, 321–333 (1984). https://doi.org/10.1007/BF00345405
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DOI: https://doi.org/10.1007/BF00345405