KDM1A对牦牛卵母细胞减数分裂成熟及其发育潜能的影响

doi:10.11843/j.issn.0366-6964.2020.10.011

Abstract

Abstract: The purpose of this study was to explore the effects of KDM1A on the meiotic maturation and developmental potential of yak oocytes. The specific inhibitor GSK-KDM1A of KDM1A was added into in vitro maturation medium of yak oocytes. After 24 h in vitro culture of yak cumulus oocyte complexes (COCs), the expansion of cumulus cells and the extrusion of the first polar body were observed. The expression level of KDM1A in oocyte was measured by immunofluorescence during in vitro culture. The expression levels of Kdm1a, Oct-4, Sox-2 and Nanog in oocytes were detected by RT-qPCR. Then, yak oocytes were fertilized after in vitro culture, and the cleavage rate and blastocyst formation rate were observed, respectively. The results showed that the cumulus cells expansion in GSK-KDM1A groups were significant lower than those in control group (P<0.05) after 24 h culture, and the cumulus cells expansion and the first polar body extrusion rate in 320 nmol·L^-1 group were significantly lower than those in 160 nmol·L^-1 group (P<0.05). During oocyte in vitro maturation, Kdm1a showed dynamic expression profile, and the expression level of Kdm1a in MⅠ-stage was significantly lower than that in GV-stage and MⅡ-stage (P<0.05). The GSK-KDM1A could significantly inhibit the expression of KDM1A protein in oocytes (P<0.05), and the expression of KDM1A in 320 nmol·L^-1 group was significantly lower than that in 160 nmol·L^-1 group (P<0.05). The expression levels of Oct-4 and Sox-2 in GSK-KDM1A group were significantly higher than that in control group (P<0.05), but there was no significant difference in the expression of Nanog (P>0.05). After 24 h culture, the cleavage rates of oocytes in GSK-KDM1A groups were significantly lower than those in control group (P<0.05), while the blastocyst formation rate was not significantly different (P<0.05). In conclusion, KDM1A is involved in regulating the meiotic maturation process of yak oocytes. GSK-KDM1A can effectively inhibit the expression of KDM1A, affect the meiotic maturation and developmental potential of oocytes, which reveal that KDM1A plays an important role in this process.

Key words: yak, oocyte, KDM1A, maturation, development

CLC Number:

S823.85

HAN Jie, XIONG Xianrong, XIONG Yan, WU Jinbo, LI Jian. Effects of KDM1A on the Meiotic Maturation and Developmental Potential of Yak Oocytes[J]. Acta Veterinaria et Zootechnica Sinica, 2020, 51(10): 2433-2442.

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Effects of KDM1A on the Meiotic Maturation and Developmental Potential of Yak Oocytes

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