Detection of two allotype-(Ig-1)-linked minor histocompatibility loci by the use ofH-2-restricted cytotoxic lymphocytes in congenic mice

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Abstract
Cytotoxic lymphocytes (CTL) were generated betweenIg-1-congenic strains BALB/c(H-2d,Ig-1a) andC.B-17(H-2d,Ig-1b) by cross-immunization in both directions and rechallenge in vitro. The effector cell populations specifically lysed target cells sharing both theH-2 haplotype and theIg-1 allele of the sensitizing strain. B- and T-cell blasts were equally good targets, suggesting thatH-2-restricted cytotoxic lymphocytes are not directed against serologically defined conventional allotypic determinants, but probably against minor histocompatibility antigens controlled by genes linked to theIg-1 complex. Competition experiments using cold target cells from a series ofIg-1b-congenic strains of the BALB/c background (BAB-14, C.B-17, C.B-26) revealed two not yet described minor histocompatibility loci linked to theIg-1 complex: We could demonstrate that BALB/c anti-C.B-17 effector cells recognize at least two distinct antigenic determinants on C.B-17 target cells, but only one on target cells from BAB-14, which carries a recombinantIg-1 complex. From these results we conclude that one of the minor histocompatibility antigens, designated as H(CH), is encoded by a gene linked to the heavy-chain constant-region (CH) genes, whereas the second minor histocompatibility antigen, designated as H(VH), is coded for by a gene linked to the heavy-chain variable-region (VH) genes. These two new genetic markers may be useful for further analysis of the mouseIg-1 complex because the analysis of the H(CH) and H(VH) genes may facilitate the search for recombinants in that chromosomal region.

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