CD14 gene variant linked to higher risk and skin manifestations in Behcet’s syndrome: New study builds on existing evidence
A recent study published in Clinical Rheumatology has identified a significant genetic association between the CD14 (C-159T) single-nucleotide polymorphism and increased susceptibility to Behcet’s syndrome, along with a strong link to its dermatological manifestations in Egyptian patients. The findings further strengthen a growing body of research highlighting the role of innate immune system dysregulation in the pathogenesis of this complex inflammatory disorder.
Behcet’s syndrome is a chronic, relapsing, multisystem inflammatory disease classified as a variable-vessel vasculitis and can affect both arteries and veins of different sizes. While the exact cause remains unclear, previous research has consistently shown a combination of genetic predisposition and environmental triggers. Among genetic factors, the HLA-B51 allele has long been recognized as the strongest susceptibility marker across multiple populations. However, recent advances have expanded the focus toward non-HLA genes, particularly those involved in innate immunity and inflammatory signaling pathways.
Over the past decade, studies have increasingly implicated innate immune receptors and their downstream signaling mechanisms in Behcet’s syndrome. Molecules such as toll-like receptors, interleukins including IL-1 and IL-6, and tumor necrosis factor-alpha have been shown to contribute to the exaggerated inflammatory response seen in affected individuals. Genome-wide association studies have also identified susceptibility loci in genes such as IL10 and IL23R, further underscoring the importance of immune regulation in disease development.
CD14 is a pattern-recognition receptor expressed on monocytes, macrophages, and neutrophils, and it plays a central role in detecting bacterial lipopolysaccharides and activating innate immune responses. Functional studies have shown that altered CD14 expression can amplify inflammatory signaling and may contribute to chronic inflammatory states. The -159 C/T polymorphism (rs2569190) in the promoter region of the CD14 gene is known to regulate transcriptional activity, with the T allele generally associated with higher circulating levels of soluble CD14 and enhanced immune responsiveness.
Previous research has linked this polymorphism to several immune-mediated diseases. An increased frequency of the T allele has been reported in patients with atopic asthma and allergic rhinitis, suggesting a role in hypersensitivity responses. Similarly, studies in systemic lupus erythematosus and lupus nephritis have demonstrated associations between CD14 variants and disease susceptibility and severity, supporting the idea that dysregulated innate immunity is a shared mechanism across autoimmune conditions.
In the current observational case-control study, researchers enrolled 51 adult Egyptian patients with Behcet’s syndrome and 51 healthy controls. Disease activity was systematically evaluated, and genetic analysis was performed using real-time polymerase chain reaction to genotype the C-159T polymorphism.
The results showed that the TT genotype was significantly more prevalent among patients at 23.7% compared to 8% in controls, corresponding to an odds ratio of 5.3 with a P value of 0.01. In addition, the T allele frequency was higher in the patient group at 49.1% compared to 31.4% in controls, with an odds ratio of 2.1 and a P value of 0.01. These findings indicate a strong genetic susceptibility signal associated with the CD14 polymorphism.
The study also demonstrated a significant association between the TT genotype and dermatological manifestations. Skin erythema was observed in 58.3% of TT genotype carriers compared to 26.9% of CT carriers, while pustular lesions were present in 41.6% of TT carriers compared to 11.5% of CT carriers. These results suggest that the CD14 polymorphism may influence both disease susceptibility and its clinical expression, particularly cutaneous involvement.
The findings are consistent with earlier evidence pointing to the role of microbial triggers in Behcet’s syndrome. It has been proposed that abnormal immune responses to commensal or pathogenic microorganisms, particularly in genetically predisposed individuals, may initiate and sustain inflammation. Given the role of CD14 in pathogen recognition, genetic variation in this receptor could influence host–microbe interactions and contribute to disease onset and progression.
Overall, this research adds to the expanding understanding of the genetic basis of Behcet’s syndrome and reinforces the importance of innate immune pathways in its pathogenesis. The identification of CD14 as a potential susceptibility and phenotypic marker may support improved risk assessment and more personalized approaches to disease management in the future.
References
- Saad MA, El Gendy HI, Shaker O, Philips MV, Elsabagh YA. The association between CD14 (C-159T) single-nucleotide polymorphism and Behcet’s syndrome and its clinical manifestations in Egyptian patients, an observational case-control genetic association study. Clin Rheumatol. 2026 Jan;45(1):375-382.
- Zhang YN, Li YJ, Li H, Zhou H, Shao XJ. Association of CD14 C159T polymorphism with atopic asthma susceptibility in children from Southeastern China: a case-control study. Genet Mol Res. 2015 Apr 30;14(2):4311-7.