Abstract
The prevailing assumption has been that the human spermatozoon provides only one centriole to the zygote: the proximal centriole, with a canonical, cylinder-like shape. This overly simplistic view has come under challenge since discovering that the human spermatozoon provides a second, atypical centriole to the zygote. The study of human zygotes is challenging for ethical reasons, and bovine zygotes provide an important model due to a similarity in centrosome embryonic inherence and function. Detailed ultrastructural analyses by Uzbekov and colleagues identify the persistence of atypical centrioles in bovine early embryos, raising questions about the original single-centriole model. Whether the parental origin of nascent atypical centrioles or their wide structural diversity and deviation from the canonical centriolar form in blastomeres constitutes sufficient evidence to warrant a reconsideration of the single-centriole model is discussed herein. Because previous human studies identified only one canonical centriole in the zygote, atypical centrioles are likely present in the early human embryo; therefore, it is time to rethink the role of paternal centrioles in human development.
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Acknowledgements
We thank Derek Kluczynski, Katerina Turner, Luke A. Achinger, Nahshon Puente, and David Albertini for editing and commenting on the manuscript.
Funding
This project was supported by Agriculture and Food Research Initiative Competitive Grant number OHOW-2020-02790 from the USDA National Institute of Food and Agriculture and Grant number 1R15HD110863 from NIH-NICHD.
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Highlights
• Most early embryonic centrioles are structurally atypical.
• The atypical spermatozoan distal centriole remains atypical in the embryo while “duplicating” new centrioles.
• The canonical spermatozoan proximal centriole changes in the embryo, sometimes acquiring an atypical structure.
• The first two new centrioles formed in the zygote are structurally atypical.
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Avidor-Reiss, T., Uzbekov, R. Revisiting the mystery of centrioles at the beginning of mammalian embryogenesis. J Assist Reprod Genet 40, 2539–2543 (2023). https://doi.org/10.1007/s10815-023-02927-4
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DOI: https://doi.org/10.1007/s10815-023-02927-4