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Role of HLA-G 14 bp polymorphism and soluble HLA-G level in recurrent spontaneous abortion

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1Alia A. El Shahaway*, 2Wafaa Salah, 2Sherin A. Shazly, 2Rasha R. Abd Elhady
1Medical Microbiology and Immunology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
2Obstetrics and gynecology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt

ABSTRACT

Background: The immune response of the mother against her embryo is supposed to be responsible for about 50 % of recurrent spontaneous abortion (RSA) case. Objectives: To assess the prevalence of HLA-G 14bp insertion/deletion (ins/del) polymorphism in females with RSA and normal pregnant females and compare the plasma levels of soluble HLA-G (sHLA-G) in the studying groups. Also, we intended to explore the association between HLA-G 14 bp polymorphism and sHLA-G plasma levels. Methodology: This case-control study involved 50 females with RSA and 50 control pregnant females. The genotype for HLA-G 14 bp (ins/del) polymorphism was performed by PCR and their sHLA-G plasma levels were measured. Results: The HLA-G del/del genotype and ins/ins genotype frequencies were significantly different in RSA group as compared to controls (P=0.002). Additionally, the incidence of the 14-bp ins allele was significantly raised in RSA group than in control (67 vs. 41%, respectively; P=0.0004). Consequently, the higher frequency of 14-bp ins allele in RSA group as compared to controls indicate that this allele is associated with an increased risk of RSA (OR 2.9, 95% CI: 1.6-5.2, P=0.0003). Conclusion: The plasma level of sHLA-G is a promising marker in the management of RSA and could be an early indicator of the fate of In Vitro Fertilization (IVF). The polymorphism in the HLA-G gene, specifically, in the 3′UTR region of exon 8 affects the plasma level of sHLA-G and subsequent pregnancy outcome.

 

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The Egyptian Journal of Medical Microbiology EJMM  ISSN Print 1110-2179 - ISSN Online: 1110-2179, The official publication of Egyptian Society of Medical Microbiology

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