Background: The results indicated that the immunologic and genetic factors play a key role in the susceptibility to this syndrome compared to other risk factors. Immunoglobulin G, representing approximately 80% of Immunoglobulins in humans and the only way that IgG2 can be passed from mother to fetus blood circulation is binding to Fcgamma receptor (FcγR) classes which have been coded by Fcgamma receptor (FcγRIIA) gene. Any changes in the FcγRIIA gene structure such as mutations or polymorphisms can be considered as risk factors on the incidence of abortion through causing the inflammation or decreasing fetus safety. This receptor is the only which can have an interaction with IgG2 antibody and the Therefore, the current study was carried out to assess the association between R/H131 polymorphism in the FcγRIIA gene and susceptibility to recurrent abortions in Iranian women. Methods: For this reason, a case-control study was confirmed to compare the frequency of FCGR2A gene R/H131 polymorphism in 150 women with recurrent miscarriage history having normal karyotype and 150 healthy women with no abortion history as control which were collected in March 2014 up to September 2015, from Royan Institute for Reproductive, Tehran, Iran. The genomic DNA was extracted from peripheral blood leukocytes and genotyping was performed using amplification refractory mutation system-polymerase chain reaction (ARMS-PCR). Results: The frequency of AA, AG, and GG genotypes in case and control groups were 31.3%, 54.7%, 14% and 27.3%, 49.2%, 23.5% respectively. According to the findings, the presence of the risk allele was not associated with increased risk of recurrent miscarriage compared with individuals lacking the risk allele and it statistically was significant (P= 0.11). No significant association was found between the age of participants and risk of abortion in Iranian studied population (P= 0.083). Conclusion: The results of present study do not support the previous findings of an association between R/H131 polymorphism in FCGR2A gene and recurrent miscarriage.
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