Contribution of -1031T/C and -376G/A tumor necrosis factor alpha polymorphisms and haplotypes to preeclampsia risk in Tunisia (North Africa)

Investigation of the linkage between TNF-alfa rs1800629 polymorphism and preeclampsia risk: A meta-analysis

BACKGROUND

Preeclampsia is a serious medical condition that significantly affects expectant mothers. Growing research showed an inconsistent association between TNF-alfa rs1800629 polymorphism and preeclampsia. The current meta-analysis was aimed at examining the potential impact of rs1800629 variant on preeclampsia.

METHODS

The Cochrane Library, Google Scholar, PubMed, EMBASE, Web of Science, and other databases were searched extensively to locate and select articles up to October 30, 2023. The PRISMA 2020 recommendations were followed to perform this study. Data analysis was done by using Comprehensive Meta analysis (v 3).

RESULTS

We have included 32 articles containing 35 studies with 3,883 patients and 5,821 controls for qualitative and quantitative data analysis. We found a strong relationship between rs1800629 variant with the increased preeclampsia risk in co-dominant model 1 (OR = 1.33, p = 0.019), co-dominant model 2 (OR = 1.43, p = 0.014), dominant model (OR = 1.25, p = 0.044), over-dominant model (OR = 1.31, p = 0.021), and allelic model (OR = 1.24, p = 0.018). This study also revealed a significantly higher risk among the Asian population in the dominant (OR = 2.31, p = 0.036) and allelic model (OR = 2.02, p = 0.028). For the Caucasian population, an increased association between the rs1800629 variant and preeclampsia risk was reported in co-dominant model 1 (OR = 1.37, p = 0.011), co-dominant model 2 (OR = 1.77, p = 0.007), dominant model (OR = 1.32, p = 0.030), recessive (OR = 1.50, p = 0.047), over-dominant (OR = 1.34, p = 0.009), and allelic model (OR = 1.32, p = 0.004). Though our study showed the protective link of the TNF-alfa polymorphism to the preeclampsia risk among the Black population, no significant outcomes were observed in any genetic models (p > 0.05).

CONCLUSION

Overall, the present meta-analysis explored a consistent linkage of the TNF-alfa rs1800629 variant to the preeclampsia risk in different ethnic groups. Additional research is required to confirm the precise relationship between the rs1800629 variant and preeclampsia risk.

Association between transforming growth factor-beta 1 polymorphisms and risk of pre-eclampsia: a meta-analysis

PURPOSE

Pre-eclampsia (PE) is a common pregnancy-specific disorder characterized by hypertension and proteinuria. Previous studies have generated conflicting results regarding the association of transforming growth factor-beta 1 (TGF-β1) gene polymorphisms (+869 T/C, -509 C/T, +915 G/C, and -800 G/A) with PE risk. Therefore, we conducted this meta-analysis to more precisely assess the role of TGF-β1 gene polymorphisms in PE.

METHODS

Eligible studies were retrieved from PubMed, Embase, Web of Science, Elsevier Science Direct, and several Chinese databases. The pooled odds ratios (ORs) and 95% confidence intervals (CIs) were used to calculate the associations.

RESULTS

A total of 11 eligible studies (1463 cases/1754 controls) were included in this meta-analysis. A statistically significant association was found between the TGF-β1 + 869 T/C polymorphism and PE risk in the Asian population and in subgroup analyses of the Hardy-Weinberg equilibrium (HWE) in controls and healthy pregnant controls. There was a statistically significant association between TGF-β1 - 509 C/T polymorphism and PE risk among Asian women, and in the subgroup analysis of healthy pregnant controls. No obvious association was observed under any genetic model for the TGF-β1 + 915 G/C and -800 G/A polymorphisms and PE risk, or between the TGF-β1 + 869 T/C and -509 C/T polymorphisms and severity of PE.

CONCLUSIONS

The present study suggested that the TGF-β1 + 869 T/C and -509 C/T polymorphisms are associated with an increased risk of PE in the Asian population. Further case-controlled studies with larger sample sizes are needed to confirm our results.