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A novel instance of class I modification (cim) affecting two of three rat class I RT1-A molecules within one MHC haplotype.

J. Immunol.2003 Jul 01;171(1):274-84. doi:10.4049/jimmunol.171.1.274
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摘要


MHC class I expression by rats of the RT1(o), RT1(d), and RT1(m) MHC haplotypes was investigated. Identical, functional cDNAs were obtained from RT1(o) and BDIX (RT1(dv1)) rats for three MHC class I molecules. RT1-A1(o/d) and -A2(o/d) are closely related in sequence to other cloned rat class Ia genes that have been shown to map to the RT1-A region, while RT1-A3 degrees is highly homologous to a class I gene identified by sequencing an RT1-A(n) genomic contig and is named A3(n). Detailed analysis of the three molecules was undertaken using serology with mAbs, two-dimensional gel analysis of immunoprecipitates, and killing assays using cytotoxic T cells. Arguments are presented suggesting that A1 degrees is the principal MHC class Ia (classical) restricting element of this haplotype. A2 degrees, which is highly cross-reactive with A1 degrees, and A3 degrees probably play more minor or distinct roles in Ag presentation. Unexpectedly, cDNAs encoding exactly the same three molecules were cloned from rats of the RT1(m) haplotype, an MHC that until now was thought to possess unique class Ia genes. RT1(m) contains the TAP-B allele of the TAP transporter, and we present evidence that functional polymorphism in rat TAP has an even greater impact on the expression of RT1-A1 degrees and -A2 degrees than it does on RT1-A(a) in the established case of class I modification (cim). Historically, this led to the misclassification of RT1(m) class Ia molecules as separate and distinct.

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