title: Monoclonal antibody identifies a new Ia-like (p29,34) polymorphic system linked to the HLA-D/DR region.
abstract: The Ia antigens of the mouse are the basis for the genetic control of the immune response. The HLA-D/DR locus is considered to be the human counterpart of the Ia subregion of the murine major histocompatibility complex. The HLA-D/DR antigens are polymorphic, and eight well defined alleles have been identified using alloantisera. More recently, 'supertypic' antigens (MB and MT) have been defined which identify clusters of HLA-D/DR specificities. Little is known about the molecular basis for the cellular and serological polymorphism of the HLA-D/DR antigens, as alloantisera are usually of very low titre and heteroantisera frequently lack monospecificity. We present here the preparation and characterization of a monoclonal antibody which defines a new polymorphic system of the HLA-D/DR region. This and similar antisera should now begin to provide the reagents with which to correlate molecular structure with the functional repertoire of the human Ia-like antigens.
mesh_terms: D000906:Antibodies; D000911:Antibodies, Monoclonal; D002999:Clone Cells / Q000276:immunology; D000939:Epitopes; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000235:genetics / Q000276:immunology*; D006801:Humans; D006822:Hybrid Cells / Q000276:immunology; D007518:Isoantibodies; D008970:Molecular Weight; D011110:Polymorphism, Genetic
chemical_list: D000906:Antibodies; D000911:Antibodies, Monoclonal; D000939:Epitopes; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D007518:Isoantibodies