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Using a case-control design, we assessed the association between single nucleotide polymorphisms (SNPs) of growth and differentiation factor 5 (GDF5)/rs143383 gene and interaction with environments and knee osteoarthritis (KOA). We recruited 288 KOA patients from the First Clinical College, Henan University of Chinese Medicine between June 2017 and May 2018. There was significant difference in genotype distribution between case group and control group (χ 2 = 22.661, P =0.000). The minor C allele was significantly higher in the case group than that in the control group (20.5 vs 8.1%, P =0.000, odds ratio (OR) = 1.62, 95% confidence interval (CI): 1.29-2.03). Significant differences were also observed in other gene models. For age, all models show significant differences ( P &lt;0.05) for those whose age was more than 60 years, and no significant difference was observed for those under 60 years. For non-smoking group, there were significant differences between case group and control group, and for smoker, significance level was found in TT compared with CC and allele gene models. Patients with drinking and Bbody mass index (MI )≥ 24 also showed significant relationship between rs143383 and osteoarthritis (OA) under the following models: TT vs CC ( P =0.000, P =0.018), TT/CT vs CC ( P =0.043), TT vs CT/CC ( P =0.000, P =0.009), and T vs C ( P =0.024, P =0.000). Other gene models indicated no significance ( P &gt;0.05). Our results revealed a possible genetic association between GDF5 and KOA, and the TT genotype of rs143383 increased the risk of KOA in Chinese Han population. The interaction between GDF5 gene and drinking, smoking, and obesity further increased the risk of KOA.

Interaction between GDF5 gene polymorphisms and environment factors increased the risk of knee osteoarthritis: a case–control study