辅助生殖技术(ART)程序通常受到排卵后衰老(POA)的影响,这可能导致受精率降低和胚胎发育受损。本研究使用RNA测序分析和实验验证来研究POA前后活体和体外成熟猪卵母细胞之间的相似性和差异。将新鲜体内成熟卵母细胞(F_vivo)和老年体内成熟卵母细胞(A_vivo)之间的差异表达基因(DEGs)与新鲜体外成熟卵母细胞(F_vitro)和老年体外成熟卵母细胞(A_vitro)之间的DEGs相交,以探索POA的协同作用。发现“细胞器”,尤其是“线粒体”,显著丰富了基因本体论(GO)术语。与线粒体功能相关的“电子传递链”和“细胞氧化还原稳态”途径相关的基因的表达在A_体内和A_体外组均显着显示出低表达模式。进行加权相关网络分析以探索A_vivo特异性基因表达模块。性状-模块关联分析表明,红色模块与体内衰老的相关性最大。红色模块中有959个基因,主要富含“RNA结合”,“mRNA代谢过程”,等。,以及在GO方面,和“剪接体”和“核苷酸切除修复”途径。DNAJC7,IK,DDX18处于基因调控网络的中心。随后,通过在生发囊泡(GV)和中期II(MII)阶段敲低其表达来验证DDX18和DNAJC7的功能,分别。在GV阶段敲低会导致细胞周期紊乱并增加纺锤体的异常率。MII阶段的击倒导致抗氧化剂褪黑激素的低效率,增加细胞内氧化应激的水平,和线粒体功能障碍。总之,POA影响卵母细胞的细胞器功能。体内卵母细胞具有一些独特的基因表达模式。这些基因可能是潜在的抗衰老靶标。这项研究提供了更好地了解POA的详细机制以及提高猪和其他哺乳动物物种辅助生殖技术成功率的潜在策略。
Assisted reproduction technology (ART) procedures are often impacted by post-ovulatory aging (POA), which can lead to reduced fertilization rates and impaired embryo development. This study used RNA sequencing analysis and experimental validation to study the similarities and differences between in vivo- and vitro-matured porcine oocytes before and after POA. Differentially expressed genes (DEGs) between fresh in vivo-matured oocyte (F_vivo) and aged in vivo-matured oocyte (A_vivo) and DEGs between fresh in vitro-matured oocyte (F_vitro) and aged in vitro-matured oocyte (A_vitro) were intersected to explore the co-effects of POA. It was found that \"organelles\", especially \"mitochondria\", were significantly enriched Gene Ontology (GO) terms. The expression of genes related to the \"electron transport chain\" and \"cell redox homeostasis\" pathways related to mitochondrial function significantly showed low expression patterns in both A_vivo and A_vitro groups. Weighted correlation network analysis was carried out to explore gene expression modules specific to A_vivo. Trait-module association analysis showed that the red modules were most associated with in vivo aging. There are 959 genes in the red module, mainly enriched in \"RNA binding\", \"mRNA metabolic process\", etc., as well as in GO terms, and \"spliceosome\" and \"nucleotide excision repair\" pathways. DNAJC7, IK, and DDX18 were at the hub of the gene regulatory network. Subsequently, the functions of DDX18 and DNAJC7 were verified by knocking down their expression at the germinal vesicle (GV) and Metaphase II (MII) stages, respectively. Knockdown at the GV stage caused cell cycle disorders and increase the rate of abnormal spindle. Knockdown at the MII stage resulted in the inefficiency of the antioxidant melatonin, increasing the level of intracellular oxidative stress, and in mitochondrial dysfunction. In summary, POA affects the organelle function of oocytes. A_vivo oocytes have some unique gene expression patterns. These genes may be potential anti-aging targets. This study provides a better understanding of the detailed mechanism of POA and potential strategies for improving the success rates of assisted reproductive technologies in pigs and other mammalian species.