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The Molecular Circuit Regulating Tooth Development in Crocodilians.

S Tsai1,2,3,4, A Abdelhamid5, M K Khan5

  • 1Department of Pathology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.

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|November 23, 2016
PubMed
Summary
This summary is machine-generated.

Alligators can regenerate teeth due to robust molecular signaling pathways. Researchers identified key pathways like Wnt, BMP, and FGF involved in alligator tooth development, offering insights for mammalian tooth renewal.

Keywords:
RNA-seqmolecular pathwaynichepolyphyodontstem celltooth cycle

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Area of Science:

  • Developmental Biology
  • Comparative Genomics
  • Molecular Biology

Background:

  • Alligators exhibit polyphyodont tooth renewal, contrasting with mammalian diphyodont or monophyodont dentition.
  • Previous studies linked alligator tooth cycle initiation to beta-catenin/Wnt pathway activity.
  • The complete molecular mechanisms of polyphyodont tooth development remained largely unknown.

Purpose of the Study:

  • To elucidate the molecular circuitry and pathways governing alligator tooth development.
  • To identify key signaling pathways active during different developmental stages of alligator teeth.

Main Methods:

  • Transcriptomic analysis (RNA-seq) of juvenile alligator dental laminae at various developmental stages.
  • Comparative analysis of gene expression profiles across developmental transitions.

Main Results:

  • Activation of Wnt, bone morphogenetic protein (BMP), and fibroblast growth factor (FGF) pathways observed during the transition from bud to cap stages.
  • Coordinated activation of Wnt ligands, receptors, and co-activators alongside the inactivation of Wnt antagonists.
  • Identification of stage-specific molecular circuitry involved in tooth development.

Conclusions:

  • Multiple signaling pathways are crucial for specific stages of alligator tooth development.
  • Wnt pathway activation appears pivotal for initiating tooth development in alligators.
  • Findings may inform strategies for modulating mammalian tooth renewal processes.