Genetic polymorphism of the sixth component of complement (C6) in mice

Genetic polymorphism of the sixth component of complement (C6) in the pig

Using agarose gel isoelectric focusing and immunoblotting with rabbit anti-rabbit C6, a genetic polymorphism has been found in the sixth component of complement (C6) in six breeds of pigs. The C6 locus was highly polymorphic. Family data indicated that pig C6 phenotypes were inherited by means of five codomonant alleles named C6A, C6B, C6C, C6D and C6E at a single autosomal locus. C6 deficiency in two of 241 individuals tested was found, which suggested the presence of a null allele in pig populations. Marked breed differences among the gene frequencies and heterozygosities at C6 locus were observed.

Allotypes of mouse complement component C6 in inbred strains and some wild populations

This collaborative work was undertaken to resolve discrepancies in reports of the number of forms of complement component C6 present in the circulation of mice from various inbred strains. Plasma C6 was analyzed by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate and by isoelectric focusing (IEF), and C6 band patterns were developed by electroblotting and immunoprobing. Results of C6 allotyping of mice from 36 strains confirmed that while 20 strains (prototype strain BALB/c) possessed only one relative mass (Mr) for which typed C6A1 on IEF, the other 16 strains all possessed more than one C6 Mr form. Moreover, IEF analysis demonstrated additional polymorphic differences; among these 16 strains, 11 typed C6A1B1 like the prototype strain CBA, the AKR and RF/J strains typed C6A2B2, and the Japanese MOM strain as well as the C57BR/cdJ and C57L/J strains possessed two forms with IEF mobilities intermediate between C6A1B1 and C6A2B2. These will now be referred to as C6A3B3. Thus, a total of four different mouse C6 haplotypes have been identified. Testing C6 allotypes in a limited number of wild mice revealed that haplotypes found in inbred strains of Western or Eastern origin tend to reflect haplotypes of the wild mice from Europe or Japan, respectively.

A gene locus controlling a serum protein migrating electrophoretically in the beta region of mice and detected by using a strain derived from the Japanese wild mouse (Mus musculus molossinus)

Antigenic specificities of serum proteins from the MOL-ANJ strain of mice (a strain derived from Japanese wild mice, Mus musculus molossinus) were studied by gel precipitation with alloantisera produced by reciprocal alloimmunization between MOL-ANJ and BALB/c mice. An alloantigen which migrates immunoelectrophoretically in the beta region of serum proteins has been identified. Evidence indicates that this antigenic specificity is controlled by a co-dominant autosomal gene locus designated by the symbol Sas-2. The evidence also suggests that Sas-2 is genetically different from the previously described Sas-1 which controls a serum protein in the mouse. Sas-2 was located by linkage analysis between Idh-1 locus and Akp-1 locus on chromosome 1.

Antigenic polymorphism of a serum protein migrating electrophoretically in the alpha region detected by using a strain derived from the Japanese wild mouse (Mus musculus molossinus)

Antigenic specificities of a serum protein from the mouse Mol-A strain (a strain derived from the Japanese wild mouse, Mus musculus molossinus) was studied by gel precipitation with alloantisera produced by reciprocal alloimmunization between Mol-A and BALB/c mice. Alloantigens which migrate immunoelectrophoretically in the alpha region of serum proteins have also been identified. The evidence indicated that this antigenic specificity is controlled by a codominant autosomal locus designated Aph-1. The evidence also suggests that the Aph-1 locus is linked to the alpha locus on chromosome 2.

Assignment of the gene locus for the sixth component (C6) of complement in mice to chromosome 15

A structural locus (C-6) for the sixth component of complement in mice is assigned to chromosome 15. Three-point linkage analysis indicated that the order of loci is C-6, Gpt-1, Gdc-1, and that the map distances are 25.9 +/- 4.9 between C-6 and Gpt-1, and 36.4 +/- 5.5 between C-6 and Gdc-1. Since Gdc-1 is more distal than Gpt-1, and C-6 is 26 cM away from Gpt-1, it is estimated that the C-6 is proximal to the centromere. In addition, a new C6 form found in AKR mice is described. We propose the designation C6B for it and C-6b for the allele encoding C6B.