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  • Association between 14 bp Insertion/Deletion Polymorphism of HLA-G Gene and Preeclampsia: A Meta-Analysis

    Objective To systematically review the association between 14 bp insertion/ deletion polymorphism of HLA-G gene and preeclampsia (PE). Methods We electronically searched in the following databases: PubMed, Web of Science, EMbase, CBM, CNKI, WanFang Data, and VIP to collect all the case-control trials on the association between 14 bp insertion/ deletion polymorphism of HLA-G gene and PE. Two reviewers independently screened literature according to the inclusion and exclusion criteria, extracted data and assessed the quality of the included studies. Then, meta-analysis was performed using RevMan 5.1 software. Results Totally 10 studies were recruited. The results of meta-analysis showed that, the preeclampsia group was higher than the control group in the frequencies of HLA-G +14 bp haplotype in the fetus and fathers and the frequencies of HLA-G +14 bp/+14 bp genotype in fathers, but its frequencies of fetal HLA-G −14 bp haplotype was significantly lower. Their pooled OR and 95%CI were 1.42 (1.10 to 1.84), 1.54 (1.25 to 1.90), 2.00 (1.19 to 3.38), and 0.67 (0.54 to 0.82). Compared with the control group, in the preeclampsia group the frequencies of HLA-G +14 bp/+14 bp genotype in fetus were higher, while the frequencies of HLA-G −14 bp/−14 bp genotype were lower (OR=1.75, 95%CI 1.11 to 2.77; OR= 0.57, 95%CI 0.41 to 0.81). In the preeclampsia group, the frequencies of mother (+14 bp/−14 bp)/ fetal (+14 bp/+14 bp) were higher than the control group (OR= 3.77, 95%CI 1.40 to 10.11), while those of mother (−14 bp/−14 bp)/ fetal (−14 bp/−14 bp) and those of father (−14 bp/−14 bp)/fetal (−14 bp/−14 bp) were lower (OR=0.52, 95%IC 0.31 to 0.85; OR=0.33, 95%CI 0.15 to 0.75). Conclusion Paternal and fetal 14 bp insertion/ deletion polymorphism of HLA-G gene might be associated with preeclampsia. And maternal-fetal genotype compatibility analysis might provide new clues for the pathogenesis research and clinical diagnosis of preeclampsia.

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