Transcobalamin II (TCN2 67A>G and TCN2 776C>G) and Transcobalamin II Receptor (TCblR 1104C>T) Polymorphisms in Korean Patients with Idiopathic Recurrent Spontaneous Abortion

Problem The transcobalamin II (TCN2) 776C>G polymorphism has been reported to be a genetic risk factor for idiopathic recurrent spontaneous abortion (RSA). However, the sample size in previous studies was small, and other TCN2 polymorphisms have not been studied. Moreover, the TCN2 67A>G and 776C>G polymorphisms, and the transcobalamin II receptor (TCblR/CD320) 1104C>T polymorphism, have demonstrated associations with immune responses. Method of study Three hundred and seventy‐eight RSA patients who had at least two consecutive spontaneous abortions were enrolled. Two hundred and seven control subjects were collected from a convenience sample. Polymerase chain reaction and restriction fragment length polymorphism analysis were performed to identify the TCN2 67A>G and 776C>G polymorphisms, and the TCblR 1104C>T polymorphism. Results RSA patients showed significantly different frequencies of the TCN2 67AG+GG genotypes compared with control subjects. Conclusion The TCN2 67G allele is a possible risk factor for idiopathic RSA.