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Related Experiment Videos

Cusp patterning defect in Tabby mouse teeth and its partial rescue by FGF.

J Pispa1, H S Jung, J Jernvall

  • 1Institute of Biotechnology, Viikki Biocenter, University of Helsinki, Finland. jpispa@operoni.helsinki.fi

Developmental Biology
|January 22, 2000
PubMed
Summary

The Tabby mouse mutation impairs tooth development, causing reduced cusps due to growth retardation. Fibroblast Growth Factor 10 (FGF-10) partially rescued this tooth defect in vitro.

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Area of Science:

  • Developmental biology
  • Genetics
  • Oral biology

Background:

  • The Tabby gene encodes Ectodysplasin, a TNF-like protein crucial for ectodermal organ development.
  • Tabby mice exhibit defects in teeth, hair, and glands, but Ectodysplasin's function remains unclear.

Purpose of the Study:

  • To investigate the detailed tooth phenotype of the Tabby mouse mutant.
  • To elucidate the role of Ectodysplasin in early tooth development and cusp formation.

Main Methods:

  • Detailed morphological analysis of adult and embryonic Tabby teeth.
  • In vitro culture of Tabby and wild-type molar tooth germs.
  • Assessment of enamel knot marker expression.
  • Testing the effects of EGF and FGF-10 on cultured Tabby molars.

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Main Results:

  • Tabby molars display abnormal cusp patterning with reduced cusp numbers and fused cusps.
  • Developmental defects were evident from the bud stage, with smaller primary enamel knots and fused secondary enamel knots.
  • Ectodysplasin transcripts localized to the outer enamel epithelium and dental lamina.
  • In vitro cultures showed fewer cusps in Tabby molars, partially rescued by FGF-10 but not EGF.

Conclusions:

  • The Tabby tooth phenotype results from early developmental growth retardation, impacting enamel knot signaling and subsequent epithelial growth.
  • FGF-10 shows potential in partially restoring tooth morphogenesis and cusp development in Tabby mutants.
  • This study clarifies Ectodysplasin's role in tooth development, suggesting a link to growth regulation and signaling pathways.