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Epigenetic Regulation of miR-25 and Lnc107153 on Expression of Seasonal Estrus Key Gene <i>CHGA</i> in Sheep
oleh: Ran Di, Yekai Fan, Xiaoyun He, Qiuyue Liu, Xiangyu Wang, Yiming Gong, Joram Mwashigadi Mwacharo, Caihong Wei, Yufang Liu, Mingxing Chu
Format: | Article |
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Diterbitkan: | MDPI AG 2023-02-01 |
Deskripsi
Pituitary pars tuberalis (PT) plays an important role as the transmission center in the seasonal reproduction of animals. It helps convert external photoperiod signals into intrinsic seasonal reproduction signals. In sheep PT, specific expression patterns of several genes (including short photoperiod-induced gene <i>CHGA</i> and long photoperiod genes <i>EYA3</i> and <i>TSHβ</i>) under different photoperiods are crucial characteristics during this signal transduction. Recent studies have revealed the role of epigenetics in regulating the expression of seasonal reproductive key genes. Therefore, we explored whether microRNAs and LncRNAs regulated the expressions of the above key genes. Firstly, the expression of miR-25 and <i>CHGA</i> showed a significant negative correlation in sheep PT. Results of the dual luciferase reporter assay and miR-25 overexpression indicated that miR-25 could inhibit the expression of <i>CHGA</i> by specifically binding to its 3′UTR region in pituitary cells. Then, expression negative correlation and dual luciferase reporter analyses were used to screen and identify the candidate LncRNA (Lnc107153) targeted by miR-25. Finally, the results of fluorescence in situ hybridization and Lnc107153 overexpression suggested that Lnc107153 and miR-25 were involved in the epigenetic regulation of <i>CHGA</i> expression. However, the expressions of <i>EYA3</i> and <i>TSHβ</i> were not regulated by miRNAs. These results will provide new insights into the epigenetic regulatory network of key genes in sheep seasonal reproduction.