Background: Self-immunization in systemic lupus is driven by defective in apoptosis. Fas, is an apoptosis-promoting cell surface receptor. The present study evaluate the possible association between APO-1/FAS Promoter (-670A/G) Polymorphism and sFAS level with susceptibility to lupus nephritis in SLE patients. Design and Methods: This study was performed on 88 female patients with SLE (mean age, 39.82 ± 10.16 years). 82 patients with lupus nephritis (mean age, 42.50 ± 6.65 years). 150 age and sex-matched person served as controls. All participants were genotyped for the APO-1/FAS Promoter (-670A/G) Polymorphism, manifestations and serum sFAS were correlated with the genotypes. Results: Serum sFAS was significantly higher in patients with -670 AA genotype compared to others. (-670A/G) AA genotype frequencies were significantly higher in the lupus nephritis and SLE patients groups compared with the controls and were associated with increased risk for lupus nephritis and SLE development (odds ratio, 4.08 and 1.91 respectively). Conclusions: The APO-1/FAS Promoter (-670A/G) A allele can be used as a genetic marker for lupus nephritis susceptibility in SLE and was associated with high sFAS level.
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