| Behçet’s disease (BD) is a chronic and rare multisystemic disorder defined
by autoimmunity and inflammatory characteristics, manifested by ocular lesions,
recurrent genital and oral ulcers, skin symptoms and arthritis as well as neurological,
intestinal, and vascular involvement. Despite the unknown cause of BD, there is some
strong documentation for immunological, genetic, environmental, and infectious
factors playing a role in the pathogenesis of BD. While the nature of the genetic
variants remains unidentified, many genetic risk factors are considered to contribute
to BD susceptibility. Along with human leukocyte antigen gene encoding B*51
(HLA‐B*51) and areas including the major histocompatibility complex class I, genome‐
wide association studies have recognized numerous other BD susceptibility genes
including those encoding interleukin (IL)‐10, IL‐12 receptor β 2 (IL‐12RB2), IL‐23
receptor (IL‐23R), C‐C chemokine receptor 1 gene, signal transducer and activator of
transcription 4 (STAT4), endoplasmic reticulum aminopeptidase (ERAP1), and genes
encoding killer cell lectin‐like receptor family members (KLRC4‐KLRK1). It is believed
that BD could be considered as a disorder lying in between autoimmune and
autoinflammatory syndromes. The positive responses to classical immunosuppressive
agents like azathioprine and cyclosporine and involvement of autoantigens in the
initiation of the disorder are the main BD features that reflect the autoimmune
nature of the disorder. In this review, we address recent findings on the role of
common cytokines, antibodies and immunogenetic factors in BD. |