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Human Molecular Genetics, 2000, Vol. 9, No. 15 2241-2250
© 2000 Oxford University Press

Genetic dissection of a rat model for rheumatoid arthritis: significant gender influences on autosomal modifier loci

Takefumi Furuya+, Jennifer L. Salstrom+, Shawna McCall-Vining1, Grant W. Cannon1, Bina Joe, Elaine F. Remmers, Marie M. Griffiths1 and Ronald L. Wilder§

Inflammatory Joint Diseases Section, Arthritis and Rheumatism Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, 9000 Rockville Pike, Building 10, Room 9N240, Bethesda, MD 20892-1820, USA and 1Research Service Veterans Affairs Medical Center and Department of Medicine/Rheumatology, University of Utah, Salt Lake City, UT, USA

Rheumatoid arthritis (RA) is a common, chronic, autoimmune, inflammatory disease that is influenced by genetic factors including gender. Many studies suggest that the genetic risk for RA is determined by the MHC, in particular class II alleles with a ‘shared epitope’ (SE), and multiple non-MHC loci. Other studies indicate that RA and other autoimmune diseases, in particular insulin-dependent diabetes mellitus (IDDM) and autoimmune thyroid disease (ATD), share genetic risk factors. Rat collagen-induced arthritis (CIA) is an experimental model with many features that resemble RA. The spontaneous diabetes-resistant bio-breeding rat, BB(DR), is of interest because it is susceptible to experimentally induced CIA, IDDM and ATD, and it has an SE in its MHC class II allele. To explore the genetics of CIA, including potential gender influences and the genetic relationships between CIA and other autoimmune diseases, we conducted a genome-wide scan for CIA regulatory loci in the F2 progeny of BB(DR) and CIA-resistant BN rats. We identified 10 quantitative trait loci (QTLs), including 5 new ones (Cia15, Cia16*, Cia17, Cia18* and Cia19 on chromosomes 9, 10, 18 and two on the X chromosome, respectively), that regulated CIA severity. We also identified four QTLs, including two new ones (Ciaa4* and Ciaa5* on chromosomes 4 and 5, respectively), that regulated autoantibody titer to rat type II collagen. Many of these loci appeared to be gender influenced, and most co-localized with several other autoimmune trait loci. Our data support the view that multiple autoimmune diseases may share genetic risk factors, and suggest that many of these loci are gender influenced.

+ These authors contributed equally to this work

§ To whom correspondence should be addressed. Tel: +1 301 496 6499; Fax: +1 301 402 0012; Email: wilderr@exchange.nih.gov


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