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The Slice Culture Method for Following Development of Tooth Germs In Explant Culture
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Published on: November 13, 2013

Patterning by heritage in mouse molar row development.

Jan Prochazka1, Sophie Pantalacci, Svatava Churava

  • 1Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, 142 20 Prague, Czech Republic.

Proceedings of the National Academy of Sciences of the United States of America
|August 17, 2010
PubMed
Summary
This summary is machine-generated.

Two rudimentary tooth buds initiate sequential mouse molar development, integrating into the first molar (M1) and influencing its evolution. These structures were previously mistaken for early M1 stages.

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Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Paleontology

Background:

  • Paleontological studies indicate two premolars were lost during mouse evolution.
  • Transient bud-like structures in mouse mandible development may represent precursors of lost premolars, but their role is controversial due to limited molecular data.

Purpose of the Study:

  • To investigate the molecular identity and developmental fate of transient bud-like structures in mouse mandible development.
  • To clarify the significance of these structures for mouse molar development and evolution.

Main Methods:

  • Analysis of molecular markers in bud-like structures.
  • 3D reconstructions of developing mouse mandibles.
  • In vitro lineage tracing experiments.

Main Results:

  • Transient signaling centers, expressing markers similar to the primary enamel knot (pEK), were identified at the tips of both anterior and posterior rudimentary buds.
  • These centers patterned sequentially before and anterior to the M1 pEK.
  • The posterior rudiment merged with the developing M1, potentially explaining M1's anterior enlargement.

Conclusions:

  • Two rudimentary tooth buds initiate sequential mouse molar development, not early M1 stages as previously thought.
  • These findings demonstrate how remnants of lost structures can integrate into organogenesis and contribute to evolutionary changes.