The association of transforming growth factor beta 1 gene polymorphisms with arthritis: a systematic review and meta-analysis

The objective of this study was to explore the association between transformation growth factor beta 1 (TGF- β 1) gene polymorphisms and different types of arthritis. PubMed, Medline, Web of Science, Cochrane Library, Biosis and four Chinese databases: China Biology Medicine, China National Knowledge Infrastructure, Wanfang and CQVIP, were searched. Studies that analyzed the association of the TGF- β 1 polymorphisms with different types of arthritis were included. OR, 95% confidence interval and P value were calculated in three models including allele, dominant and recessive models, using D + L method. The Newcastle–Ottawa Scale was used to assess the quality of the included studies. TGF- β 1 869T > C polymorphism was significantly associated with rheumatoid arthritis (RA) in allele and recessive models, but not in dominant model (allele model T vs. C: OR = 1.30, 95% CI = 1.13–1.49, P < 0.001; recessive model CC vs. TT + TC: OR = 0.57, 95% CI = 0.43–0.76, P < 0.001; dominant model TT vs. TC + CC: OR = 1.20, 95% CI = 0.99–1.45, P = 0.063). Additionally, allele and recessive models showed that TGF- β 1 -509C > T was significantly correlated with RA susceptibility, while dominant model revealed nonsignificant correlation (allele model: C vs. T: OR = 1.51; 95% CI = 1.00–2.28; P = 0.049; recessive model: TT vs. CC + TC: OR = 0.52, 95% CI = 0.37–0.72, P = 0.000; dominant model: CC vs. TT + TC: OR = 1.48; 95% CI = 0.79–2.76; P = 0.223). However, no significant association was found between TGF- β 1 polymorphisms and ankylosing spondylitis (AS) or osteoarthritis (OA) risk. This study demonstrated that 869T > C, -509 C > T polymorphisms of TGF- β 1 gene were associated with increased susceptibility of RA, while polymorphisms of TGF- β 1 gene were not associated with OA and AS. These findings suggest that studying TGF- β 1 genotype may be useful in the prevention and management of RA. However, more studies are needed to evaluate the association of TGF- β 1 gene polymorphisms with the susceptibility of OA and AS.