Dynamic changes in the global transcriptome of bovine germinal vesicle oocytes after vitrification followed by in vitro maturation
Jianwei Huang A , YongShun Ma A B , Shao Wei A , Bo Pan B , Yu Qi A , YunPeng Hou C , QingYong Meng C , GuangBin Zhou B D and HongBing Han A D
+ Author Affiliations
- Author Affiliations
A Beijing Key Laboratory for Animal Genetic Improvement, China Agricultural University, Beijing 100193, PR China.
B Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, PR China.
C State Key Laboratory of AgroBiotechnology, China Agricultural University, Beijing 100193, PR China.
D Corresponding authors. Emails: hanhongbing@cau.edu.cn; zguangbin@sicau.edu.cn
Reproduction, Fertility and Development 30(10) 1298-1313 https://doi.org/10.1071/RD17535
Submitted: 24 October 2017 Accepted: 13 March 2018 Published: 17 April 2018
Abstract
This study was conducted to investigate the effect of vitrification on the dynamics of the global transcriptome in bovine germinal vesicle (GV) oocytes and their in vitro-derived metaphase II (MII) oocytes. The GV oocytes were vitrified using the open-pulled straw method. After warming, GV oocytes and the resulting MII-stage oocytes were cultured in vitro for 2 h and 24 h respectively and were then collected. The fresh GV oocytes and their in vitro-derived MII oocytes were used as controls. Then, each pool (fresh GV, n = 3; vitrified GV, n = 4; fresh MII, n = 1 and MII derived from vitrified GV, n = 2) from the different stages was used for mRNA transcriptome sequencing. The results showed that the in vitro maturation rates of GV oocytes were significantly decreased (32.36% vs 53.14%) after vitrification. Bovine GV oocyte vitrification leads to 12 significantly upregulated and 19 downregulated genes. After culturing in vitro, the vitrification-derived MII oocytes showed 47 significantly upregulated and six downregulated genes when compared with those from fresh GV oocytes. Based on molecular function–gene ontology terms analysis and the Kyoto encyclopaedia of genes (KEGG) pathway database, the differentially expressed genes were associated with the pathways of cell differentiation and mitosis, transcription regulation, regulation of actin cytoskeleton, apoptosis and so on, which potentially result in the lower in vitro development of GV bovine oocytes.
Additional keywords: cattle, differentially expressed genes, egg freezing, GV oocytes, oocyte developmental potential.
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