title: Molecular analysis of the genetic relationship of trans interacting factors at the T/t complex.
abstract: The T/t complex is an extensive genetic region proximal to the H-2 complex on mouse chromosome 17, with multiple effects on embryonic development, spermatogenesis and recombination. Recently, two-dimensional gel analysis of testicular cell proteins identified a gene within the T/t complex that codes for a major cell surface-associated protein, p63/6.9 (ref. 4). The wild-type gene, Tcp-1b, codes for a 63,000-molecular weight protein (p63/6.9b), whereas a mutant allele, Tcp-1a, which occurs in all intact t haplotypes, codes for a more acidic form of the protein (p63/6.9a). Analysis of partial t haplotypes obtained from rare recombination events showed that Tcp-1a correlated completely with the tail interaction factor tT, which is thought to be a genetic allele of T, thus raising the possibility that the locus of T codes for the p63/6.9 protein. We report here that the p63/6.9 proteins produced by seven chromosomes carrying independently derived dominant mutations at the locus of T are all indistinguishable from the wild-type form; thus, the cumulative data indicate that the Tcp-1 gene is most probably not at the locus of T.
mesh_terms: D000818:Animals; D005796:Genes; D005804:Genes, Lethal; D008040:Genetic Linkage; D007526:Isoelectric Point; D008285:Major Histocompatibility Complex; D008297:Male; D008565:Membrane Proteins / Q000235:genetics; D051379:Mice; D008817:Mice, Mutant Strains / Q000235:genetics*; D013094:Spermatozoa / Q000502:physiology*; D013623:Tail
chemical_list: D008565:Membrane Proteins