An overview on Sjögren's syndrome and systemic lupus erythematosus' genetics

Major autoimmune rheumatic disorders, such as systemic lupus erythematosus and Sjögren's syndrome, are defined by the presence of autoantibodies. These diseases are brought on by immune system dysregulation, which can present clinically in a wide range of ways. The etiologies of these illnesses are complex and heavily impacted by a variety of genetic and environmental variables. The most powerful susceptibility element for each of these disorders is still the human leukocyte antigen (HLA) area, that was the initial locus found to be associated. This region is primarily responsible for the HLA class II genes, such as DQA1, DQB1, and DRB1, however class I genes have also been linked. Numerous genetic variants that do not pose a risk to HLA have been found as a result of intensive research into the genetic component of these diseases conducted over the last 20 years. Furthermore, it is generally acknowledged that autoimmune rheumatic illnesses have similar genetic backgrounds and share molecular pathways of disease, including the interferon (IFN) type I routes. Pleiotropic sites for autoimmune rheumatic illnesses comprise TNIP1, DNASEL13, IRF5, the HLA region, and others. It remains a challenge to determine the causative biological mechanisms beneath the genetic connections. Nonetheless, functional analyses of the loci and mouse models have produced recent advancements. With an emphasis on the HLA region, we present an updated summary of the structure of genes underpinning both of these autoimmune rheumatic illnesses here.