Acta Veterinaria et Zootechnica Sinica ›› 2025, Vol. 56 ›› Issue (10): 4796-4806.doi: 10.11843/j.issn.0366-6964.2025.10.004

• Review • Previous Articles     Next Articles

Research Progress on Cryopreservation Technology of Animal Embryos after Sampling

DONG Jianhua1,2(), YANG Baigao1, ZHANG Xiaomeng1, FENG Xiaoyi1, SONG Haoran1, LIU Yang1, WANG Zizhuo1, WANG Yanbo1, LI Chongyang1, LÜ Lihua2, ZHAO Xueming1,*()   

  1. 1. Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
    2. College of Animal Science, Shanxi Agricultural University, Jinzhong 030801, China
  • Received:2025-03-10 Online:2025-10-23 Published:2025-11-01
  • Contact: ZHAO Xueming E-mail:15143173829@163.com;zhaoxueming@caas.cn

Abstract:

Post-sampling embryo cryopreservation technology is a critical component of preimplantation genetic testing (PGT), holding significant application value in embryo sex selection, genetic screening, genomic selection, and assisted reproduction. However, embryonic sampling procedures may lead to zona pellucida damage, reduced cell count, and epigenetic abnormalities, thereby limiting cryopreservation efficiency. Recent advancements, including optimized sampling methods (e.g., polar body biopsy, blastomere biopsy, and trophectoderm biopsy), improved culture medium formulations (e.g., supplementation with L-arginine and glutathione), and refined cryopreservation protocols (e.g., vitrification techniques), have markedly enhanced the cryopreservation efficiency of post-sampling embryos. Furthermore, non-invasive techniques (e.g., analysis of cell-free DNA in embryo culture medium) and epigenetic modifications (e.g., DNA methylation regulation) offer novel approaches to minimize embryonic damage. This review summarizes the mechanisms of cryopreservation-induced damage in post-sampling embryos and protective strategies, with a focus on cutting-edge advancements in zona pellucida repair, epigenetic regulation, and cryopreservation efficiency. By evaluating the strengths and limitations of existing technologies, this review aims to provide theoretical foundations and technical references for developing safe and efficient cryopreservation protocols, thereby promoting their application and adoption in livestock breeding and assisted reproductive technologies.

Key words: embryo sampling, PGT, cryopreservation, freezing efficiency

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