Abstract
The mouse strain B10.D2-H-2da carries the mutantH-2da allele, derived after chemical induction, and this has been shown to be a gain and loss mutation involving theH-2Dd locus.BALB/c- H-2db, derived spontaneously, is a loss mutation only, and appears not to involve theH-2Dd, but rather theH-2Ld locus. The two mutations effectboth graft rejection and serologically detected H-2 specificities (Type II mutation). In the experiments described in this study, theloss mutations in theH-2da andH-2db mutants have been compared by skin grafting, and by direct and absorption serological techniques: (1) By skin grafting, using the well established complementation method, it has been shown thatH-2da andH-2db do not complement each other, i.e., the mutation in both occurred at the same ‘locus.’ However, by appropriate selection of donor and recipient, it has become clear thatH-2da had a greater loss than didH-2db, althoughH-2da includes the loss found inH-2db. (2) Serological studies have demonstrated that H-2D.4 was altered inH-2da, but not inH-2db; ‘H-2.28’ (detected by D-28b and D-29) was decreased or lost in both mutants;H-2db anti-BALB/c failed to react withH-2da; both mutants reacted similarly with D-28 sera. In addition, sera made usingH-2da as donor did not contain an anti-H 2.28 antibody. The loss mutation involvingH-2da therefore appears to have led also to the loss of H-2.28 as found inH-2db. We conclude that theH-2da strain arose after a complex mutation or recombination event which involvedboth theH-2Dd locus and the closely linkedH-2Ld locus, whereasH-2db affects only theH-2L locus.
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Morgan, G.M., McKenzie, I.F.C. & Melvold, R.W. The relationship between theH-2 loss mutations ofH-2da andH-2db in the mouse. Immunogenetics 7, 247–258 (1978). https://doi.org/10.1007/BF01844012
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DOI: https://doi.org/10.1007/BF01844012