title: The E beta hot spot of recombination in wild-derived natural recombinant MHC haplotypes. Cross-over site mapping and the identification of a 1.0-kb E beta deletion in the p and w14 haplotypes.
abstract: Detailed molecular analysis of three wild-derived MHC haplotypes provided evidence for an important role of the E beta recombinational hot spot in the recent evolution of the mouse I region. Examination of RFLP and restriction maps of cloned DNA permitted the mapping of the natural cross-over events in the haplotypes carried by strains B10.GAA37 (w21) and B10.KPB128 (w19) to a fragment of DNA not exceeding 4.1 kb, which lies almost entirely within the intron separating the beta 1 and beta 2 exons of the E beta gene. In the w14 haplotype (strain B10.STC77), which appears to be a natural recombinant between a p-like parental haplotype and another wild-derived haplotype, the site of crossing over can be mapped to a segment between the beta 2 exon of the E beta gene (left border) and the E beta 2 gene (right border). This segment containing the cross-over site in the w14 haplotype includes the E beta hot spot. In addition, the w14 haplotype as well as the standard p haplotype contain a deletion of approximately 1.0 kb in the second intron of the E beta gene, which may represent the product of an unequal cross-over event in a E beta recombinational hot spot.
mesh_terms: D000818:Animals; D000835:Animals, Wild / Q000235:genetics*; D002872:Chromosome Deletion; D003433:Crosses, Genetic; D003434:Crossing Over, Genetic; D006183:H-2 Antigens / Q000235:genetics; D006239:Haplotypes; D000949:Histocompatibility Antigens Class II / Q000235:genetics*; D051379:Mice / Q000235:genetics*; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D010446:Peptide Fragments / Q000302:isolation & purification; D012150:Polymorphism, Restriction Fragment Length; D011995:Recombination, Genetic
chemical_list: D006183:H-2 Antigens; D000949:Histocompatibility Antigens Class II; C024138:I-E-antigen; D010446:Peptide Fragments