Problem: The miR-196a2T>C and miR-499A>G polymorphisms have been reported to be genetic risk factors for recurrent spontaneous abortion; however, that previous study focused on the genetic analyses of pregnant women rather than aborted fetuses. Because annexin A1 is a target of miR-196a2 and is related to anti-inflammation, miR-196a2 may be immunologically important. Moreover, miR-146a, miR-149, miR-196a2, and miR-499 have shown associations with immune responses.
Method Of Study: One hundred and eighty-two spontaneously aborted fetuses (SAFs) were <20 weeks of gestational age. The control subjects were 101 healthy children and 302 adults collected from a convenience sample. Polymerase chain reaction and restriction fragment length polymorphism analysis was performed to identify the miR-146aC>G, miR-149T>C, miR-196a2T>C, and miR-499A>G genotypes.
Results: Chromosomally normal SAFs had significantly different frequencies of the miR-196a2CC, miR-146aCC/miR-196a2CC, and miR-149TT/miR-196a2CC genotypes compared with control subjects.
Conclusions: miR-196a2CC, miR-146aCC/miR-196a2CC, and miR-149TT/miR-196a2CC in fetuses are possible risk factors for spontaneous abortion.
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