Susceptibility genetics of systemic lupus erythematosus.

The etiology of systemic lupus erythematosus (SLE) is determined in part by genetic factors which influence susceptibility to the disease. These factors presumably have a major role in determining the clinical and laboratory manifestations of SLE. Certain newer observations which may pertain to an understanding of the genetic basis of SLE will be critically reviewed in this chapter. These observations are based on advances in the analysis of human SLE and the increased knowledge provided by various murine models of human autoimmune processes. However, the specific genes involved and the mechanisms by which they exert their effect are at present still unknown. Special attention will be given newer insights into the role of genes of the major histocompatibility complex (MHC) and their relationship to the genes encoding the T cell antigen receptor. The role of classic immunoglobulin genes as well as more complex mechanisms involving preferential maternal or paternal genetic effects are also discussed. The contribution of genes encoding complement and complement receptors toward the expression of the disease state are discussed in brief.