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Related Experiment Video

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Ovarian Tissue Culture to Visualize Phenomena in Mouse Ovary
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Cross-species regulatory network analysis identifies FOXO1 as a driver of ovarian follicular recruitment.

Ashley E Kramer1, Alberto Berral-González2, Kathryn M Ellwood1

  • 1Department of Animal and Food Sciences, University of Delaware, Newark, DE, USA.

Scientific Reports
|December 27, 2024
PubMed
Summary

This study identifies key gene regulators in laying hen ovaries. Master Regulator Analysis revealed FOXO1 and CLOCK as crucial for follicular development and reproductive efficiency.

Keywords:
Broiler breedersFOXO1FollicleLayer hensMaster regulatorsOvary

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Area of Science:

  • Animal Science
  • Reproductive Biology
  • Genomics

Background:

  • Transcriptional regulation in late-stage laying hen ovarian follicles is poorly understood.
  • Master regulators driving differentially expressed genes (DEGs) in pre-recruitment and pre-ovulatory stages are unknown.

Purpose of the Study:

  • To identify master regulators controlling DEGs in laying hen ovarian follicle development.
  • To elucidate the transcriptional landscape of pre-recruitment and pre-ovulatory phases.

Main Methods:

  • Utilized Master Regulator Analysis (MRA) combined with the Algorithm for the Reconstruction of Accurate Cellular Networks (ARACNe) for the first time in laying hen research.
  • Constructed an ARACNe network with 10,466 nodes and 292,391 edges.
  • Employed Virtual Inference of Protein-activity by Enriched Regulon (VIPER) for MRA to identify master regulators.

Main Results:

  • FOXO1 was identified as a master regulator, influencing 275 DEGs and impacting apoptosis, proliferation, and hormonal regulation pathways.
  • CLOCK, a circadian rhythm regulator, was found to be upregulated in the pre-ovulatory stage.
  • New insights into the transcriptional control of follicle development were provided.

Conclusions:

  • FOXO1 and CLOCK are key master regulators in laying hen ovarian follicle development.
  • Findings offer a foundation for understanding avian reproductive efficiency.
  • This study pioneers MRA and ARACNe in laying hen ovarian research.