Association between maternal single-nucleotide polymorphisms in HLA-G gene and risk of preeclampsia

Abstract

Aim

To determine the relationship between the maternal single-nucleotide polymorphisms (SNPs) in human leukocyte antigen G (HLA-G) gene and preeclampsia (PE), so as to provide guidance for the early risk prediction of PE.

Methods

From October 2017 to October 2019, a total of 99 pregnant women were enrolled in this cross-sectional study. The PE group included 51 pregnant women with severe PE, and the control group included 48 pregnant women with normal delivery during the same period. DNA was extracted and the SNPs in HLA-G gene of the two groups were sequenced. Maternal SNPs in HLA-G gene affecting the occurrence of the PE were determined.

Results

In this study, patients with PE had increased gravidity (p = .002), increased BMI before delivery (p = .004), reduced neonatal weight (p < .001), reduced gestational weeks (p < .001), reduced placental weight (p < .001), and increased proportion of cesarean section (p < .001). There were significant differences in SNPs at locus 29794467, 29796376, and 29799440 between the two groups (p < .05). In locus 29799440, patients with genotype CC had a lower risk of PE than patients with genotype TT (p = .047), with an odds ratio (OR) of 0.347(95%CI: 0.031, 3.881). And there was no significant difference in the risk of PE between patients with genotype CT, and those with genotype TT (p = .090) (OR = 2.344 95%CI: 0.187, 29.344)

Conclusion

There is an association between a SNP in locus 29799440 of the HLA-G gene and susceptibility of PE in Han Chinese pregnant women, and the risk of PE increases with genotype CT/TT in pregnant women.

Keywords:

• Preeclampsia
• human leukocyte antigen G
• single-nucleotide polymorphism

Acknowledgments

None.

Authors’ contributions

CM, YYZ and WYZ designed the study. CM, YYZ, XWL and WYZ collected and analyzed the data. CM and YYZ drafted and wrote the manuscript. XWL and WYZ revised the manuscript critically for intellectual content. All authors gave intellectual input to the study and approved the final version of the manuscript.

Ethics approval and consent to participate

This study protocol was formulated in accordance with the requirements of the Declaration of Helsinki of the World Medical Association. And it was approved by the Ethics Committee of Beijing Obstetrics and Gynecology Hospital (NO.2019-KY-032-01). Informed consent was received from all participants.

Consent for publication

Not Applicable.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Availability of data and materials

The dataset generated and analyzed during the current study are not publicly available as they may contain information that could be confidential, but are available from the corresponding author on reasonable request.

Additional information

Funding

This study was supported by National Key R and D Program of China [No. 2016YFC1000403].