Genomes and Genes
Genetic Determinants of Ankylosing Spondylitis Severity
Principal Investigator: Michael Ward
Affiliation: Stanford University
Abstract: The association between human leukocyte antigen (HLA) B27 and ankylosing spondylitis (AS) is among the strongest associations known between a disease and a genetic marker. Genes, both within and outside the major histocompatibility complex, are believed to account for more than 90% of the population variance in AS. While these associations clearly indicates strong genetic contributions to the susceptibility to AS, whether genes influence the severity, of AS is unknown. The severity of AS varies widely among patients, with some having severe persistent joint inflammation, functional limitation, premature work disability, and early spinal fusion. We hypothesize that the severity of -AS is genetically determined, and that genes that influence susceptibility to AS, genes that influence the severity of inflammatory responses, and genes regulating transforming growth factor-beta are among the genes that also influence its severity. We propose a model of AS severity in which genetic differences among patients influence the immune response and consequently the persistence and severity of joint inflammation. Persistent severe joint inflammation thereafter leads to spinal ankylosis and poorer long-term health outcomes. We will test this model in two stages. First, we will identify genetic markers associated with worse radiological outcomes, greater functional disability, work disability and need for total hip arthroplasty in a retrospective cohort study of 400 patients with AS of 20 years or longer. Second, we will test these genetic markers for associations with persistent active inflammation in a prospective cohort study of 200 patients with early AS who will be repeatedly assessed over 2 years. The model will be supported if the genetic markers that are associated with persistent active inflammation are also associated with poorer long-term health outcomes. In addition, the prospective cohort will enable the development and assessment of new clinical and radiographic measures of disease activity in AS for use in clinical trials. Understanding the contribution of genetic factors to differences in the severity of AS and in the health outcomes of patients would further our understanding of the pathogenesis of AS, provide important prognostic information, and could identify subgroups at high risk for poor outcomes who could then be targeted for more aggressive interventions.
Funding Period: 2001-09-28 - 2006-08-31
more information: NIH RePORT
- Risk factors for functional limitations in patients with long-standing ankylosing spondylitisMichael M Ward
National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, US Department of Health and Human Services, Bethesda, MD 20892, USA
Arthritis Rheum 53:710-7. 2005..To identify risk factors for functional limitations in patients with ankylosing spondylitis (AS) of at least 20 years' duration...
- Prospective meta-analysis of interleukin 1 gene complex polymorphisms confirms associations with ankylosing spondylitisA M Sims
Diamantina Institute of Cancer, Immunology and Metabolic Medicine, University of Queensland, Brisbane, Quensland, Australia
Ann Rheum Dis 67:1305-9. 2008..The aim of the current study was to determine the contribution of interleukin (IL)1 gene cluster polymorphisms previously implicated in susceptibility for ankylosing spondylitis (AS) to AS susceptibility in different populations worldwide...
- Impact of ankylosing spondylitis on work and family life: comparisons with the US populationMichael M Ward
National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, Maryland 20892, USA
Arthritis Rheum 59:497-503. 2008..To examine the impact of ankylosing spondylitis (AS) on work disability, nonparticipation in the labor force, marriage, divorce, and childbearing...
- Occupational physical activities and long-term functional and radiographic outcomes in patients with ankylosing spondylitisMichael M Ward
National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, Maryland 20892 1468, USA
Arthritis Rheum 59:822-32. 2008..We sought to identify specific occupational activities associated with functional limitations and radiographic damage in patients with longstanding ankylosing spondylitis (AS)...
- Clinical and immunogenetic prognostic factors for radiographic severity in ankylosing spondylitisMichael M Ward
National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD 20892, USA
Arthritis Rheum 61:859-66. 2009..To improve prognostic ability in ankylosing spondylitis (AS), we sought to identify demographic, clinical, and immunogenetic characteristics associated with radiographic severity in a large cohort of patients...