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Related Experiment Video

Updated: May 31, 2026

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation
09:29

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Evolution of leptin structure and function.

Robert J Denver1, Ronald M Bonett, Graham C Boorse

  • 1Department of Molecular, Cellular and Developmental Biology, The University of Michigan, Ann Arbor, USA. rdenver @ umich.edu

Neuroendocrinology
|June 17, 2011
PubMed
Summary
This summary is machine-generated.

Leptin, a hormone regulating energy balance, was identified in the lizard Anolis carolinensis. Its conserved signaling pathway suggests an ancient role in appetite control across vertebrates.

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Area of Science:

  • * Evolutionary biology
  • * Molecular endocrinology
  • * Comparative genomics

Background:

  • * Leptin (Lep) is a hormone produced by adipocytes that regulates energy balance.
  • * It signals energy reserves to the brain, influencing metabolism, growth, and reproduction.
  • * Leptin's role in appetite suppression is well-established in mammals.

Purpose of the Study:

  • * To identify and characterize leptin (Lep) genes in the reptile Anolis carolinensis.
  • * To investigate the evolutionary conservation of leptin and its signaling pathway in vertebrates.
  • * To explore the conserved function of leptin in regulating energy balance.

Main Methods:

  • * Isolation and sequencing of two Lep genes from Anolis carolinensis.
  • * Comparative analysis of amino acid sequences and tertiary structures of vertebrate leptins.
  • * In vitro testing of leptin's potency on heterologous leptin receptors (LepRs).
  • * Examination of the conserved Janus kinase (Jak)/signal transducer and activator of transcription (STAT) signaling pathway.

Main Results:

  • * Two distinct Lep genes were identified in the lizard Anolis carolinensis.
  • * Despite sequence divergence, vertebrate leptins share conserved tertiary structures and signaling mechanisms.
  • * Key tyrosine residues in the LepR cytoplasmic domain are conserved, crucial for Jak2/STAT signaling.
  • * Leptin demonstrates conserved anorexigenic effects across vertebrate classes.

Conclusions:

  • * The identification of Lep genes in a reptile expands our understanding of leptin evolution.
  • * Conserved LepR signaling via Jak/STAT pathways highlights an ancient mechanism for energy balance regulation.
  • * Leptin's ancient and conserved role in appetite suppression underscores its fundamental importance in vertebrate physiology.