Abstract

Mothers and their fetuses are hereditarily unlike. Surprisingly, no less than 50% human pregnancies reach full term despite the tendency of the immune system to eliminate of non-self units. Reduction of adaptive maternal immune answer, which is planned to reject strange factors, is essential for a pregnancy to reach full term. However, approximately 5% couples trying to conceive experience 2 recurrent miscarriages (RMs).

HLA-G, which is produced by the external trophectoderm layer and has unique biological features, is involved in the implantation and maintenance of fetus. Serum HLA-G levels are correlated with the risk of RM. Recent studies indicate that a 14-bp HLA-G, INDEL polymorphism decreases the level of HLA-G mRNA, which in turn decreases the amount of HLA-G produced. An understanding of gene parameter and the function of polymorphic sites in the functioning of HLA-G products may enable the development of approaches targeting HLA-G for more detail of causes of RM.

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