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Related Concept Videos

Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
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Related Experiment Video

Updated: Sep 29, 2025

Analyzing Craniofacial Morphogenesis in Zebrafish Using 4D Confocal Microscopy
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Thyroid hormone shapes craniofacial bones during postembryonic zebrafish development.

Stephanie Keer1, Joshua D Storch1, Stacy Nguyen2

  • 1Department of Biological Sciences, The George Washington University, Science and Engineering Hall, Washington, District of Columbia, USA.

Evolution & Development
|March 25, 2022
PubMed
Summary

Thyroid hormone (TH) is essential for shaping adult craniofacial bone morphology in zebrafish, influencing key feeding structures during larval development. Altered TH levels result in abnormal bone shapes with potential functional impacts.

Keywords:
craniofacial skeletondevelopmentgeometric morphometricsthyroid hormonezebrafish

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Area of Science:

  • Developmental biology
  • Evolutionary biology
  • Comparative anatomy

Background:

  • Craniofacial bone shape influences ecological function and evolutionary adaptations.
  • Thyroid hormone (TH) regulates skeletal development and metamorphosis in vertebrates.

Purpose of the Study:

  • To investigate the role of TH in shaping the craniofacial skeleton of zebrafish, a non-metamorphic vertebrate.
  • To identify developmental periods sensitive to TH for craniofacial shape modification.

Main Methods:

  • Analysis of craniofacial bone shapes in zebrafish from late-larval to adult stages.
  • Quantification of bone morphology under varying developmental thyroid hormone profiles (wild-type, hypothyroidism, excess TH).
  • Focus on bones involved in prey detection, capture, and processing.

Main Results:

  • TH is required for the development of adult morphology in three out of four studied craniofacial bones.
  • Hypothyroidism led to retention of immature bone shapes into adulthood.
  • Excess TH caused precocious shape changes, resulting in abnormal morphologies.
  • Specific functional skeletal elements, including the tripus, mandibular symphysis, hyomandibula, and pharyngeal jaw, showed high sensitivity to TH.

Conclusions:

  • TH plays a crucial role in sculpting mature craniofacial bone morphology, particularly during larval development in zebrafish.
  • Deviations in TH levels during development can lead to abnormal bone structures with significant functional consequences.
  • TH signaling pathways represent potential targets for evolutionary modifications in craniofacial development.