畜牧兽医学报 ›› 2025, Vol. 56 ›› Issue (1): 222-231.doi: 10.11843/j.issn.0366-6964.2025.01.021

• 生物技术与繁殖 • 上一篇    下一篇

基于scWGBS探究玻璃化冷冻对猪孤雌激活囊胚基因组甲基化水平的影响

杨柏高1,2(), 徐皆欢3, 张亮1, 龙熙1, 戴建军3, 赵学明2,*, 潘红梅1,*()   

  1. 1. 重庆市畜牧科学院, 重庆 402460
    2. 中国农业科学院北京畜牧兽医研究所, 北京 100193
    3. 上海市农业科学院畜牧兽医研究所, 上海 201106
  • 收稿日期:2024-07-30 出版日期:2025-01-23 发布日期:2025-01-18
  • 通讯作者: 赵学明,潘红梅 E-mail:Yangbaigao915@163.com;panhm_2118@163.com
  • 作者简介:杨柏高(1991-),男,重庆人,博士,主要从事动物繁殖研究,E-mail: Yangbaigao915@163.com
  • 基金资助:
    重庆市技术创新与应用发展专项重点项目(cstc2021jscx-dxwtBX0004);重庆市人民政府与中国农业科学院战略合作资助项目(重庆地方猪胚胎冷冻保存技术研究与猪育种新材料创制,23310)

Exploring the Effect of Vitrification on Genome Methylation Level of Porcine Parthenogenetic Activation Blastocysts by scWGBS

YANG Baigao1,2(), XU Jiehuan3, ZHANG Liang1, LONG Xi1, DAI Jianjun3, ZHAO Xueming2,*, PAN Hongmei1,*()   

  1. 1. Chongqing Academy of Animal Sciences, Chongqing 402460, China
    2. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
    3. Institute of Animal Science and Veterinary Science, Shanghai Academy of Agricultural Sciences, Shanghai 201106, China
  • Received:2024-07-30 Online:2025-01-23 Published:2025-01-18
  • Contact: ZHAO Xueming, PAN Hongmei E-mail:Yangbaigao915@163.com;panhm_2118@163.com

摘要:

旨在探究玻璃化冷冻对猪孤雌激活(parthenogenetic activation, PA)囊胚基因组甲基化水平的影响。以猪第6天PA囊胚为研究对象,分别采用常规玻璃化冷冻液(玻璃化冷冻Ⅰ组)和改良玻璃化冷冻液(玻璃化冷冻Ⅱ组)进行玻璃化冷冻-复苏试验,每组选择3枚复苏形态良好的囊胚用于单细胞全基因组甲基化测序(single cell whole-genome bisulfite sequencing,scWGBS),分析囊胚基因组甲基化水平变化。结果显示,与新鲜组相比,玻璃化冷冻Ⅰ组猪PA囊胚的基因组整体甲基化水平极显著降低(18% vs. 20.9%, P < 0.01),而玻璃化冷冻Ⅱ组显著升高(21.5% vs. 20.9%, P < 0.05)。与新鲜组相比,在玻璃化冷冻Ⅰ组共鉴定到2 717个差异甲基化区域(differential methylation region, DMR),而在玻璃化冷冻Ⅱ组共鉴定到1 964个DMRs。基因功能富集分析结果显示,玻璃化冷冻导致胚胎发育、ATP代谢、MAPK信号通路、Wnt信号通路等生物学过程相关基因的甲基化水平发生紊乱。在玻璃化冷冻Ⅱ组中,Hippo信号通路、PI3K-Akt信号通路和mTOR信号通路等生物学过程更为活跃。综上所述,玻璃化冷冻改变猪PA囊胚基因组甲基化水平,其可能通过扰乱胚胎发育、ATP代谢、MAPK信号通路、Wnt信号通路等相关基因的甲基化水平进而损害猪PA囊胚冻后发育。此外,Hippo信号通路、PI3K-Akt信号通路和mTOR信号通路可作为缓解玻璃化冷冻损伤的候选途径。

关键词: 猪, 孤雌激活, 囊胚, 玻璃化冷冻, scWGBS

Abstract:

This study aimed to investigate the effect of vitrification on genome methylation level of porcine parthenogenetic activation (PA) blastocysts. The porcine PA blastocysts on day 6 were used for vitrification-thawing experiments using conventional vitrification solution (vitrification group Ⅰ) and improved vitrification solution (vitrification group Ⅱ). Three blastocysts with good morphology were selected from each group for single cell whole-genome bisulfite sequencing (scWGBS) to analyze the genomic methylation levels changes in blastocysts. The results showed that compared with the fresh group, the genomic methylation levels of porcine PA blastocysts in the vitrification group Ⅰ were significantly reduced (18% vs. 20.9%, P < 0.01), while the vitrification group Ⅱ were significantly increased (21.5% vs. 20.9%, P < 0.05). Compared with the fresh group, a total of 2 717 differential methylation regions (DMRs) were identified in the vitrification group Ⅰ, and a total of 1 964 DMRs were identified in the vitrification group Ⅱ. Gene function enrichment analysis showed that vitrification caused disturbances in the methylation levels of genes related to biological processes such as embryonic development, ATP metabolism, MAPK signaling pathway, and Wnt signaling pathway. In the vitrification Ⅱ group, biological processes such as the Hippo signaling pathway, PI3K-Akt signaling pathway, and mTOR signaling pathway were more active. In summary, vitrification changes the genomic methylation level of porcine PA blastocysts, which may damage the development of porcine PA blastocysts by disrupting the methylation levels of genes related to embryonic development, ATP metabolism, MAPK signaling pathway, and Wnt signaling pathway, etc. In addition, the Hippo signaling pathway, PI3K-Akt signaling pathway, and mTOR signaling pathway can be used as candidate pathways to alleviate vitrification injury.

Key words: pig, parthenogenetic activation, blastocyst, vitrification, scWGBS

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