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Related Experiment Videos

Multiple digit formation in Xenopus limb bud recombinants

H Yokoyama1, T Endo, K Tamura

  • 1Graduate School of Science, Tohoku University, Sendai, 980-77, Japan.

Developmental Biology
|May 16, 1998
PubMed
Summary

Recombinant Xenopus limb buds with reaggregated mesenchyme formed over 30 digits. This study explores limb development and regeneration potential in Xenopus tadpoles, revealing insights into digit formation.

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Area of Science:

  • Developmental biology
  • Regenerative medicine
  • Amphibian research

Background:

  • Limb development in amphibians is a complex process involving precise spatial and temporal signaling.
  • Understanding the factors that regulate digit formation is crucial for regenerative studies.

Purpose of the Study:

  • To investigate the role of mesenchyme reaggregation in Xenopus limb bud development.
  • To analyze the expression patterns of key developmental genes (FGF8, SHH) in recombinant limb buds.
  • To explore the potential for enhanced digit formation and regeneration.

Main Methods:

  • Preparation of recombinant Xenopus limb buds by grafting mesenchyme.
  • Dissociation and reaggregation of mesenchyme from anterior and posterior limb bud halves.

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  • Analysis of gene expression patterns for FGF8 (apical ectodermal ridge marker) and SHH (zone of polarizing activity marker).
  • Histological examination of cartilage formation and digit patterning.

    • Main Results:

    • Recombinant limb buds with reaggregated mesenchyme developed over 30 digits with cartilage segmentation, unlike normal limb development.
    • Patchy FGF8 expression and broad SHH expression were observed in recombinant limb buds prior to multiple digit formation.
    • Recombination with anterior mesenchyme resulted in anterior digits with claws, while posterior mesenchyme formed posterior digits without claws.

    Conclusions:

    • Mesenchyme reaggregation significantly enhances digit formation in Xenopus limb buds, suggesting a role in pattern regulation.
    • Gene expression patterns of FGF8 and SHH are altered in recombinant limb buds, correlating with altered digit development.
    • The study highlights the plasticity of limb development and provides insights into the regenerative capacity of Xenopus limb buds.