A. Satoh and Y. Nakada contributed equally to this work.
Analysis of scleraxis and dermo-1 genes in a regenerating limb of Xenopus laevis
Version of Record online: 8 FEB 2006
Copyright © 2006 Wiley-Liss, Inc.
Special Issue: Campos-Ortega Special Focus
Volume 235, Issue 4, pages 1065–1073, April 2006
How to Cite
Satoh, A., Nakada, Y., Suzuki, M., Tamura, K. and Ide, H. (2006), Analysis of scleraxis and dermo-1 genes in a regenerating limb of Xenopus laevis. Dev. Dyn., 235: 1065–1073. doi: 10.1002/dvdy.20701
- Issue online: 10 MAR 2006
- Version of Record online: 8 FEB 2006
- Manuscript Accepted: 29 DEC 2005
Xenopus laevis larvae can regenerate an exact replica of the missing part of a limb after amputation at an early limb bud stage. However, this regenerative capacity gradually decreases during metamorphosis, and a froglet is only able to regenerate hypomorphic cartilage, resulting in a spike-like structure (spike). It has been reported that the spike has tissue deformities, e.g., a muscleless structure. However, our previous study demonstrated that the muscleless feature of the spike can be improved. The existence of other kinds of tissue, such as tendon, has not been clarified. In this study, we focused on the tendon and dermis, and we isolated the scleraxis and dermo-1 genes, which are known to be marker genes for the tendon and dermis, respectively. The expressions of these genes were investigated in both the developmental and regenerating processes of a Xenopus limb. Although muscle was needed to maintain scleraxis expression, scleraxis transcription was detectable in the muscleless spike. Additionally, although grafting of matured skin, including dermal tissue, inhibited limb regeneration, the expression of dermo-1, a dermal marker gene, was detected from the early stage of the froglet blastema. These results indicate that tendon precursor cells and dermal cells exist in the regenerating froglet blastema. Our results support the idea that spike formation in postmetamorphic Xenopus limbs is epimorphic regeneration. Developmental Dynamics 235:1065–1073, 2006. © 2006 Wiley-Liss, Inc.