Recent updates in human leukocyte antigen B27–associated uveitis

There has been progressive understanding in etiopathogenesis, clinical presentation, and effective treatment of anterior uveitis (AU) over the years. Sudden onset, symptomatic acute anterior uveitis (AAU) in a young adult, often male, classically arouses suspicion for human leukocyte antigen (HLA) B27-related uveitis. While the ocular presentation is frequently the earliest manifestation, its systemic counterparts within the spectrum, viz., spondyloarthropathies (SpA), including ankylosing spondylitis (AS), reactive arthritis (RA), psoriatic arthritis (PA), and inflammatory bowel disease-associated inflammation, pose greater diagnostic and therapeutic challenges for rheumatologists and internists. This places the ophthalmologist in a uniquely advantageous yet responsible position in initiating etiologic evaluation and facilitating early systemic recognition. Rapid advances in immunology and molecular medicine have significantly expanded the diagnostic and therapeutic landscape of HLA B27-related disease. Emerging insights implicating the gut microbiome, autoinflammatory mechanisms, and innate immune dysregulation have reshaped traditional concepts of pathogenesis. Concurrently, an improved understanding of cytokine networks and immune signaling pathways has led to the development of targeted biologic and synthetic disease-modifying therapies. Given the dynamic, multisystem nature of HLA B27-associated disease and its variable organ involvement, optimal management necessitates close multidisciplinary collaboration among ophthalmologists, rheumatologists, gastroenterologists, and internists. This article briefly explores the evolving concepts of the complex enigma of the HLA B27 molecule and the basis for recent trends in its understanding at the cellular, molecular, biochemical, and clinical levels.