Abstract
The effect of the selective breeding of mice for high or low antibody production to complex immunogens is largely “nonspecific”, since it modifies the responsiveness of high (H) and low (L) lines to many antigens unrelated to the selection antigen. However, the nonspecific effect of the polygenic control operating in these lines is not a general feature. For example, the group of genes in selection IV, carried out for responsiveness to somatic antigen of Salmonella, does not modify the responses to sheep erythrocytes (SE). Despite equivalent responses in H and L mice of selection IV, a large variability was found in individual responses of F2 interline hybrids, which demonstrates the presence of alleles with high or low effect on responses to SE. A selective breeding (Selection IV-A) was therefore initiated from this F2 population for responsiveness to SE. A progressive interline divergence occurred during the first seven generations of selection; the interline separation was due to polygenic regulation (about four independent loci from a preliminary estimate).
Equivalent responses to the s antigen of Salmonella are observed in the two lines. This constitutes additional evidence for distinct polygenic regulation of responses to SE and to somatic antigen. Moreover, the pattern of responses to several unrelated antigens (nonspecific effect) also differs between Selections IV and IV-A.
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Abbreviations
- H:
-
high responder lines
- L:
-
low responder lines
- s:
-
somatic antigen of Salmonella
- f:
-
flagellar antigen of Salmonella
- R:
-
response to selection
- S:
-
selection differential
- F0 :
-
foundation population
- h2 :
-
heritability (realized)
- RGG:
-
rabbit gamma globulin
- CE:
-
chicken erythrocyte
- HE:
-
human erythrocyte
- PE:
-
pigeon erythrocyte
- SE:
-
sheep erythrocyte
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Cabrera, W.H., Ibanez, O.M., Oliveira, S.L. et al. Evidence for distinct polygenic regulation of antibody responses to some unrelated antigens in lines of mice selected for high or low antibody responses to somatic antigen of Salmonella . Immunogenetics 16, 583–592 (1982). https://doi.org/10.1007/BF00372027
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DOI: https://doi.org/10.1007/BF00372027