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Stable Isotope In-Vivo Labeling for Mass-Spectrometry Identification of Paternal Metabolites Transferred from Sperm to Oocyte During Fertilization
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Metabolic heterogeneity during preimplantation development: the missing link?

Daniel R Brison1, Roger G Sturmey2, Henry J Leese3

  • 1Department of Reproductive Medicine, Old St Mary's Hospital, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Sciences Centre, University of Manchester, Oxford Road, Manchester M13 9WL, UK.

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Summary

Mammalian embryos lack functional gap junctions until after 8 cells, leading to cell autonomy and increased sensitivity to environmental stress. This metabolic heterogeneity is resolved by apoptosis after embryonic genome activation.

Keywords:
gap junctionsmetabolismpreimplantation embryo

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Area of Science:

  • Developmental Biology
  • Cellular Biology
  • Reproductive Biology

Background:

  • Most mammalian tissues utilize gap junctions for intercellular communication, ensuring metabolic homogeneity and coordinated development.
  • Developing mammalian preimplantation embryos uniquely lack functional gap junctions until the 8-cell stage.
  • This delay impacts embryonic cell homogeneity and coordinated responses to genetic or environmental challenges.

Purpose of the Study:

  • To investigate the implications of the delayed formation of functional gap junctions in mammalian preimplantation embryos.
  • To examine the consequences of this developmental "missing link" on cellular homogeneity and response coordination.
  • To assess embryo sensitivity to environmental factors during early development.

Main Methods:

  • Review of preimplantation development physiology and gap junction biology.
  • Examination of experimental evidence on blastomere functional differences.
  • Analysis of embryo sensitivity to environmental perturbation.
  • Assessment of consequences of ablating gap junction formation/function.

Main Results:

  • Species-specific differences in embryonic genome activation and heterogeneity influence conclusions.
  • Cleavage-stage mammalian embryos exhibit cell-autonomous metabolism due to absent gap junctions.
  • Embryos are more sensitive to environmental perturbation during the gap junction-absent cleavage stage.

Conclusions:

  • Absence of gap junctions necessitates cell autonomy and increases environmental sensitivity in early mammalian embryos.
  • Metabolic heterogeneity, partly due to absent gap junctions, is resolved by apoptosis post-embryonic genome activation.
  • For assisted reproduction, early embryo transfer post-fertilization is supported due to heightened sensitivity to stress before gap junction formation.