Transcriptomic profile of the porcine oviductal epithelial cells during the peri-conceptional period.

The optimal environment in the oviduct is created by adjusting its ultrastructure and secretory activity to serve the most suitable protection of gametes and to support embryo development. Through gametes/embryo's presence inside the oviduct, the oviductal transcriptomic profile may be altered, and these changes may be caused by DNA methylation. The results of the present study documented that in the epithelial cells of the ampulla and isthmus of the oviducts collected from pigs during the peri-conceptional period, the most differentially expressed genes (DEGs) were down-regulated. Identified DEGs were classified into gene ontology categories as well as annotated into different biological pathways. From evaluated DEGs, genes important for embryo development were selected and the level of DNA methylation was determined. It was documented CLDN18, MUC1, CYP19A3, SOCS1, and ESR1 methylation level have been altered. The presence of embryos in the oviduct changed the transcriptomic profile and the level of DNA methylation in the epithelial cells of ampulla and isthmus during the peri-conceptional period.