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Pre-implantation development of cattle embryos produced from fresh bull semen enriched for X- chromosome-bearing spermatozoa using a monoclonal antibody

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Abstract

Immunological approaches are gaining attention as a convenient and economical method for sex-sorting mammalian spermatozoa. A monoclonal antibody (WholeMom™) has previously been reported to cause agglutination of Y-chromosome-bearing spermatozoa in frozen-thawed semen for gender preselection. However, its usefulness for gender preselection in fresh semen and subsequent in vitro fertilization (IVF) after freeze-thawing has not been reported. This study investigated the in vitro development of cattle embryos produced from fresh bull semen pre-treated with WholeMom™ monoclonal antibody. Results showed that antibody-treated, non-agglutinated spermatozoa (presumably X-chromosome-bearing spermatozoa) could fertilize cattle oocytes in vitro. However, embryos generated from non-agglutinated (enriched in X-chromosome-bearing spermatozoa) had a lower (p < 0.05) ability to cleave (66.4 ± 2.5% vs. 75.1 ± 3.3%) than those of non-treated control sperm. Nevertheless, the percentage of blastocysts developed from cleaved embryos did not differ (p > 0.05) between the groups (34.8 ± 3.7% vs. 35.8 ± 3.4%). Duplex PCR of blastocysts, using a bovine-specific universal primer pair and a Y-chromosome-specific primer pair, showed a sex ratio of 95.8% females from sex-sorted spermatozoa, which was higher than those of non-treated control spermatozoa (46.4%). In conclusion, the results of the present study suggest that monoclonal antibody-based enrichment of X- chromosome-bearing spermatozoa can be applied to fresh bull semen without compromising their post-fertilization early embryonic development to the blastocyst stage. Future studies should investigate the term development and sex ratio of calves from antibody-treated spermatozoa.

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Funding

This work was supported by the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries (IPET) through the Technology Commercialization Support Program, funded by the Ministry of Agriculture, Food and Rural Affairs (MAFRA)(No. 817024-03-3-HD020).

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SJU: Performed the experiments, analyzed the data, and prepared the draft manuscript; YTH: Performed the experiments and analyzed the data; DMY: Provided Resources and intellectual inputs and approved the final manuscript; DKK: Provided Resources and intellectual inputs and approved the final manuscript; MKG: Conceptualization and design of experiments, manuscript writing and final approval.

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Correspondence to Sang Jun Uhm or Mukesh Kumar Gupta.

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Competing interests

Dong Ku Kim is the CEO of Nuri Science Inc., South Korea. However, the author’s afflation and employment did not influence the experiment design, data interpretation, etc. Other authors declare no conflict of interest.

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Uhm, S.J., Heo, Y.T., Yu, D.M. et al. Pre-implantation development of cattle embryos produced from fresh bull semen enriched for X- chromosome-bearing spermatozoa using a monoclonal antibody. Vet Res Commun 47, 2101–2109 (2023). https://doi.org/10.1007/s11259-023-10160-8

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  • DOI: https://doi.org/10.1007/s11259-023-10160-8

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