Transforming growth factor-β1 gene polymorphism in psoriasis vulgaris.

Background: Increased transforming growth factor beta 1 (TGF-β1) in the epidermis and serum has been found in psoriatic patients. The mechanism for this increase remains unclear.

Objective: To study the TGF-β1 gene polymorphism at codon 10 and its relation to psoriasis susceptibility in a sample of Egyptian patients.

Materials And Methods: This cross-sectional study involved 70 patients with psoriasis vulgaris and 100 age- and sex- comparable healthy volunteers as a control group. Genomic DNA was prepared from peripheral blood lymphocytes from all subjects using QIAamp DNA mini kit (QIAGEN Inc., Germany). The TGF-β1 polymorphism was genotyped by PCR-based restricted fragment length polymorphism (PCR-RFLP) analysis. Amplification of codon 10, located in exon 1 of TGFβ1 gene was done through PCR reaction using gene-specific primers.

Results: Statistically significant difference was found between psoriasis patient and controls as regards TGF-β1 (T869C) polymorphism (=0.045). The presence of TT genotype was associated with a 3-fold risk of psoriasis compared to CC genotype (=0.016, OR: 3.13 95% CI: 1.24-7.88). T allele was significantly more frequent in psoriasis patients (=0.017). TGF-β1 gene mutation was significantly higher among psoriasis patients with positive family history (=0.007).

Conclusion: TGF-β1 gene polymorphism at codon 10 (T869C) is significantly associated with susceptibility to psoriasis in Egyptian patients. This polymorphism is more common in patients with a positive family history of psoriasis.