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Updated: Sep 11, 2025

Reproductive Techniques for Ovarian Monitoring and Control in Amphibians
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Nonavian Reptile Reproduction Functions With a Reduced Gonadotropin System.

Maya S Kummrow1, Jose V Roig-Genovés2, Ignacio Giménez2

  • 1Clinic for Zoo Animals, Exotic Pets and Wildlife, Department for Small Animals, University of Zurich, Zurich 8057, Switzerland.

Endocrinology
|August 12, 2025
PubMed
Summary
This summary is machine-generated.

Nonavian reptiles may have lost their LH receptor (LHR), relying on a single GtHR for reproduction. This study reveals unique GtH-receptor interactions in reptiles, proposing a modified reproductive control paradigm.

Keywords:
endocrinological bioassaygonadotropin hormone receptorligand-receptor coevolutionnonavian sauropsidareductive evolutionreproduction

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Area of Science:

  • Comparative Endocrinology
  • Reproductive Biology
  • Genomics

Background:

  • Vertebrate reproduction relies on pituitary gonadotropins (GtHs) like FSH and LH, binding to gonadotropin hormone receptors (GtHRs).
  • Nonavian reptiles (sauropsids) exhibit unusual responses to GtHs, lacking expected LHR and FSHR diversity found in other vertebrates.

Purpose of the Study:

  • Investigate the number and function of reptilian gonadotropin hormone receptors (GtHRs).
  • Clarify the evolutionary history and functional characteristics of GtHRs in nonavian sauropsidans.

Main Methods:

  • Genomic and transcriptomic analyses to identify GtHRs in various tetrapod species.
  • Bioassays to determine the binding specificity of GtHRs from squamates, chelonians, crocodylians, birds, and mammals with homologous and heterologous GtHs.

Main Results:

  • Genomic data suggest LHR inactivation occurred independently in multiple nonavian sauropsidan lineages.
  • FSHR binding specificity varies: squamate FSHR is promiscuous, chelonian FSHR favors LH, and crocodilian FSHR responds only to LH.
  • Evidence points to a modified reproductive control system in nonavian reptiles, potentially involving a single GtHR.

Conclusions:

  • Nonavian sauropsidans likely possess an inactivated LHR, with reproduction controlled by a single GtHR and varying GtH numbers.
  • The study proposes a new paradigm for neuroendocrine control of nonavian reptilian reproduction, emphasizing FSHR expression and temperature-dependent functions.