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Updated: May 20, 2026

High-fat Feeding Paradigm for Larval Zebrafish: Feeding, Live Imaging, and Quantification of Food Intake
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Knockdown of leptin A expression dramatically alters zebrafish development.

Qin Liu1, Mark Dalman, Yun Chen

  • 1Department of Biology and Program in Integrated Bioscience, University of Akron, Akron, OH 44325, USA.

General and Comparative Endocrinology
|July 31, 2012
PubMed
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Blocking leptin A or its receptor in zebrafish embryos using morpholino antisense oligonucleotides (MO) caused developmental defects. These findings highlight leptin A

Area of Science:

  • Developmental biology
  • Molecular biology
  • Genetics

Background:

  • Leptin signaling is crucial for metabolic regulation and development in vertebrates.
  • The specific roles of leptin A and its receptor in embryonic development are not fully understood.
  • Zebrafish embryos offer a powerful model for studying developmental processes due to their transparency and rapid external development.

Purpose of the Study:

  • To investigate the function of leptin A and its receptor during embryonic zebrafish development.
  • To characterize the phenotypic consequences of blocking leptin A or leptin receptor expression.
  • To elucidate the specific developmental processes affected by leptin signaling disruption.

Main Methods:

  • Morpholino antisense oligonucleotide (MO) technology was used to knock down leptin A or leptin receptor expression in zebrafish embryos.

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Last Updated: May 20, 2026

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  • Morphant embryos were analyzed for developmental abnormalities at various stages.
  • Histological analysis was performed to assess cell differentiation in specific tissues, including the brain, retina, heart, and inner ear.
  • Rescue experiments involving co-injection of leptin A MO and recombinant leptin were conducted.

    • Main Results:

    • Leptin A or leptin receptor morphants exhibited significant developmental defects, including smaller body size, reduced eye size, undeveloped inner ear, enlarged pericardial cavity, curved body/tail, and larger yolk sacs.
    • These defects persisted in larvae up to 6-9 days post-fertilization.
    • While early brain development was largely unaffected, differentiation of dorsal brain and retinal cells was severely disrupted in older morphant embryos.
    • Inner ear formation was also severely disrupted, consistent with known leptin receptor expression patterns.
    • Co-injection with recombinant leptin partially rescued the observed wild-type phenotype.

    Conclusions:

    • Leptin A plays critical and distinct roles in zebrafish embryonic development, influencing organogenesis and cell differentiation.
    • Disruption of leptin signaling leads to a spectrum of morphological and cellular defects, particularly affecting the brain, retina, and inner ear.
    • The findings underscore the conserved importance of leptin signaling in vertebrate development and provide insights into its specific functions in zebrafish.