Blackwell Publishing Journal Backfiles 1879-2005
Mouse strains differ widely in their natural killer(NK)-cell activity. In the (A X B6) X A backcross, high reactivity was linked to H-2b, although non-H-2-linked genes were also demonstrated (Petranyi et al., 1975). Harmon et al. (1977) demonstrated an H-2Dd-associated reactivity gene (1977). In the present study, we have tested eleven B10 congenic strains for NK activity. The H-2Dd strains B10.A, B10.T(6R), B10.S(7R), B10.HTT and B10.D2 were more highly reactive than B10, B10.S, B10.G, B10.A(2R) and B10.BR, which do not carry the d allele at the H-2D locus. While this confirms the H-2Dd association of a reactivity gene, an exception was found in the B10.A(5R) strain that was low reactive in spite of the fact that it carries H-2Dd. This suggests the possibility that the H-2Dd-associated gene is outside H-2, to the right of Tla.The AKR.H-2b congenic line had the same low activity as the AKR.H-2k strain; both were much lower than B6. This suggests either one of two possibilities: the H-2b-linked reactivity gene is relatively distant from the H-2 complex, although localized on chromosome 17 or alternatively, if localized within or in the close neighbourhood of H-2, it requires non-H-2 genes for full expression.Previously, we have shown that the B6 X DBA/2 F1 hybrid was more highly reactive than either one of its two parental strains (Klein et al., 1978). A similar complementation effect is described in the present paper for the B10.D2 congenic strain. The high reactivity of this line can be due to the combined effect of an H-2b-linked gene from DBA/2 and the non-H-2 background of B10 or, alternatively, the former, together with an H-2b-linked gene from B6 that lies well outside outside the H-2 locus itself.
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