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      HLA disease associations: models for the study of complex human genetic disorders.

      Critical Reviews in Clinical Laboratory Sciences
      Arthritis, Rheumatoid, genetics, immunology, Diabetes Mellitus, Type 1, Disease Susceptibility, Genes, MHC Class I, Genes, MHC Class II, Genetics, Medical, methods, HLA Antigens, Humans, Major Histocompatibility Complex, Pedigree

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          Abstract

          The genes of the human leukocyte antigen (HLA) region, the major histocompatibility complex (MHC) of humans, control a variety of functions involved in immune response and influence susceptibility to over 40 diseases. Theoretical studies in the development of models to determine the modes of inheritance of the HLA-associated diseases have led to a better understanding of the inheritance patterns in insulin-dependent diabetes mellitus (IDDM), rheumatoid arthritis, multiple sclerosis, ankylosing spondylitis, hemochromatosis, celiac disease, and others. It is now clear that many of the HLA-associated diseases involve heterogeneity in their HLA components, as well as non-HLA genetic factors. This review is presented using HLA-associated diseases, and in particular IDDM, as the example of interest, but the observations and techniques presented have direct relevance to the study of all human diseases with a complex genetic component. Three methods for localizing disease-predisposing genes are presented: (1) association studies, including population, family, and relative predispositional effects, (2) affected sib pair and other affected-relative methods, and (3) lod score analysis. A variety of complementary methods for studying the mode(s) of inheritance of the alleles at the disease-predisposing locus and for identifying the alleles and amino acids directly involved in the disease process also are presented.

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