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Original Article

Links Between Type I Interferons and the Genetic Basis of Disease in Mouse Lupus

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Pages 491-502 | Published online: 03 Aug 2009
 

Abstract

Systemic lupus erythematosus (SLE), like other autoimmune diseases, is a complex genetic trait with contributions from both major histocompatibility complex (MHC) genes and multiple non-MHC genes. Most of the contributing genes have yet to be identified. Studies of mouse models of lupus have provided important insight into the immunopathogenesis of lupus-like IgG autoantibody production and lupus nephritis, and genetic analyses of these mice are helping to unravel the complex and heterogeneous genetic basis of disease. Recent studies in both human SLE and mouse models of lupus have emphasized a potential role of type I interferons (IFN-α/β) in the initiation and perpetuation of disease. There is now increasing interest in genes that affect IFN-α/β expression–activity and IFN-regulated target genes that may be involved in the disease process. One example is interferon-inducible gene 202 (Ifi202), which has been identified as a major candidate susceptibility gene in the New Zealand hybrid model of lupus. Studies suggest that increased expression of this transcription factor leads to lupus through inhibition of lymphocyte apoptosis, although its effects on immune function are extremely complex and have yet to be fully defined. This review will focus on the genetic basis of disease in mouse lupus with a special emphasis on those genetic contributions that may affect IFN-α/β activity and those that may be target genes of IFN-α/β action.

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