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Genome mutation after the introduction of the gene editing by electroporation of Cas9 protein (GEEP) system into bovine putative zygotes

  • Zhao Namula
  • Manita Wittayarat
  • Maki Hirata
  • Takayuki Hirano
  • Nhien Thi Nguyen
  • Quynh Anh Le
  • Mokhamad Fahrudin
  • Fuminori TaniharaEmail author
  • Takeshige Otoi
Article
  • 45 Downloads

Abstract

The present study was designed to investigate the effects of voltage strength on embryonic developmental rate and mutation efficiency in bovine putative zygotes during electroporation with the CRISPR/Cas9 system to target the MSTN gene at different time points after insemination. Results showed that there was no significant interaction between electroporation time and voltage strength on the embryonic cleavage and blastocyst formation rates. However, increasing the voltage strength to 20 V/mm to electroporate the zygotes at 10 h after the start of insemination yielded significantly lower blastocyst formation rates (P < 0.05) than those of the 10-V/mm electroporated zygotes. Mutation efficiency was then assessed in individual blastocysts by DNA sequence analysis of the target sites in the MSTN gene. A positive correlation between mutation rate and voltage strength was observed. The mutation efficiency in mutant blastocysts was significantly higher in the zygotes electroporated with 20 V/mm at 10 h after the start of insemination (P < 0.05) than in the zygotes electroporated at 15 h, irrespective of the voltage strength. We also noted that a certain number of blastocysts from zygotes that were electroporated with more than 15 V/mm at 10 h (4.8–16.7%) and 20 V/mm at 15 h (4.8%) were biallelic mutants. Our results suggest that the voltage strength during electroporation as well as electroporation time certainly have effects on the embryonic developmental rate and mutation efficiency in bovine putative zygotes.

Keywords

Bovine CRISPR/Cas9 Electroporation In vitro fertilization MSTN gene 

Notes

Acknowledgments

We thank the staff of the Meat Inspection Office of Tokushima Prefecture for supplying the bovine ovaries.

Funding information

This study was supported in part by the JSPS KAKENHI grant numbers JP17H03938, JP17K19325, and JP18K12062. We acknowledge Tokushima University for their financial support of the Research Clusters program of Tokushima University (No. 1701001).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

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Copyright information

© The Society for In Vitro Biology 2019

Authors and Affiliations

  1. 1.Faculty of Veterinary ScienceGuangdong Ocean UniversityZhanjiangChina
  2. 2.Faculty of Veterinary SciencePrince of Songkla UniversitySongkhlaThailand
  3. 3.Laboratory of Animal Reproduction, Faculty of Bioscience and BioindustryTokushima UniversityTokushimaJapan
  4. 4.Faculty of Veterinary ScienceBogor Agricultural UniversityBogorIndonesia

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