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Association Between Transforming Growth Factor-β1 Polymorphisms and Ischemic Stroke Susceptibility: A Meta-Analysis

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Abstract

Epidemiological studies have suggested a potential relationship between the transforming growth factor-β1 (TGF-β1) gene and ischemic stroke (IS) risk; however, the current results are inconsistent. Therefore, we performed this meta-analysis to assess the precise association between TGF-β1 polymorphisms and IS risk. Online databases were searched for themes related to TGF-β1 polymorphisms and ARE risk. Quantitative calculations of odds ratios (ORs) and confidence intervals (CIs) were performed using 5 genetic models of each variant locus. Heterogeneity tests, cumulative analyses, sensitivity analyses, and publication bias were conducted to examine statistical power. Moreover, changes in the secondary structure and minimum free energy (MFE) were explored using in silico analysis. Nineteen case-control studies were included in our meta-analysis on rs1800468 G>A, rs1800469 C>T, and rs1800470 T>C polymorphisms and IS risk. Overall, only a marginal association was found between the rs1800469 C>T polymorphism and IS risk (T vs C: OR = 1.12, 95%CI = 1.00-1.46, P = .05, I = 77.0%). Otherwise, no significant association was observed between the rs1800468 G>A and rs1800470 T>C polymorphisms and IS risk in general and stratified analyses. Moreover, no significant changes in secondary structure and MFE were found in any of the 3 polymorphic loci. Current evidence cautiously suggests that TGF-β1 polymorphisms are not associated with IS susceptibility.

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