Predisposing factors to spondyloarthropathies

Area of Science:

• Immunogenetics
• Rheumatology
• Epidemiology

Background:

• Ankylosing spondylitis (AS) predisposition is primarily genetic, with environmental factors playing a role.
• Human Leukocyte Antigen (HLA)-B27 and HLA-B60 are known genetic markers associated with AS.
• The precise mechanisms linking these genes to AS and the identity of environmental triggers are currently unknown.

Purpose of the Study:

• To explore the genetic and environmental factors contributing to ankylosing spondylitis (AS) and related spondyloarthropathies.
• To investigate the role of major histocompatibility complex (MHC) and non-MHC genes in AS susceptibility and disease presentation.
• To understand the unknown mechanisms of HLA-B27 association with AS.

Main Methods:

• Review of epidemiologic studies on genetic predisposition to AS.
• Analysis of the contribution of MHC and non-MHC genes to spondyloarthritis.
• Consideration of findings from transgenic animal models and advancements in genetic research.

Main Results:

• Genetic factors, particularly within the MHC, are major determinants of spondyloarthritis susceptibility, accounting for less than 50% of the total risk.
• While HLA-B27 and HLA-B60 are associated with AS, their specific roles and the environmental triggers remain undefined.
• Current knowledge does not allow prediction of which HLA-B27 carriers will develop AS or its specific form.

Conclusions:

• Spondyloarthritis develops in genetically susceptible individuals upon exposure to unknown environmental triggers.
• Further research integrating genetic insights, including transgenic models, is crucial to elucidate AS pathogenesis.
• Advances in genetics offer new avenues to investigate the complex interplay of genes and environment in AS.