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Expression and DNA Methylation Status of the Imprinted Genes PEG10 and L3MBTL1 in the Umbilical Cord Blood and Placenta of the Offspring of Assisted Reproductive Technology

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Abstract

The aim of this study is to investigate the expression and DNA methylation status of the imprinted genes PEG10 and L3MBTL1 in the offspring of assisted reproductive technology (ART). The ART group consists of 30 cases of placenta and umbilical cord blood from ART full-term, uncomplicated singleton pregnancy progeny, and the normal control group consists of 30 cases of placenta and umbilical cord blood from natural full-term, uncomplicated singleton pregnancy progeny. The imprinted genes PEG10 and L3MBTL1 are analyzed, and the expression and methylation status of the two genes are detected using real-time quantitative polymerase chain reaction (QRT-PCR), immunohistochemistry (IHC), Western blotting (WB), and methylation-specific polymerase chain reaction (MSP). Compared with the normal control group, the PEG10 mRNA relative quantity (RQ) value in the placenta is 0.994 ± 0.458, with its RQ value up-regulated (P = 0.015). The PEG10 mRNA RQ value in the umbilical cord blood is 0.875 ± 0.452, with its RQ value up-regulated (P = 0.002). However, the L3MBTL1 mRNA RQ value in the placenta is 0.404 ± 0.234, with its RQ value down-regulated (P = 0.024). The L3MBTL1 mRNA RQ value in the umbilical cord blood is 0.337 ± 0.213, and there is no difference in the umbilical cord blood (P = 0.081). Compared with the normal control group, the expression of PEGl0 protein in the placenta of the ART progeny is up-regulated (P = 0.000), while the expression of L3MBTLl protein is down-regulated (P = 0.000). The methylation status of the PEGl0 promoter region in the placenta in the ART group is lower than that in the normal control group (P = 0.037), and that of the promoter region of the umbilical cord blood is lower than that of the natural pregnancy group (P = 0.032). The methylation status of the L3MBTLl promoter region is higher in the placenta than in the normal control group (P = 0.038), and there is no difference between the two groups in the umbilical cord blood (P = 0.301). In the ART group, the values of PEGl0 and L3MBTLl RQ in the placenta and the umbilical cord blood of the hypermethylated group are lower than in those of the hypomethylated group. ART may increase the risk of the abnormal expression of PEG10 and L3MBTL1 in offspring imprinted genes. The methylation of the promoter region may be the mechanism that regulates the expression of PEGl0 and L3MBTL1.

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Authors and Affiliations

  1. The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China

    Yun-xia Wang, Li-fang Yue, Jun-wei Zhang, Yi-wen Xiong, Ji-jun Hu, Lu-lu Wang, Zhe Li, Yang Liu, Lu Yang & Li-jun Sun

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Wang, Yx., Yue, Lf., Zhang, Jw. et al. Expression and DNA Methylation Status of the Imprinted Genes PEG10 and L3MBTL1 in the Umbilical Cord Blood and Placenta of the Offspring of Assisted Reproductive Technology. Reprod. Sci. 28, 1133–1141 (2021). https://doi.org/10.1007/s43032-020-00417-x

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