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Updated: Mar 6, 2026

Three and Four-Dimensional Visualization and Analysis Approaches to Study Vertebrate Axial Elongation and Segmentation
Published on: February 28, 2021
Coordination of limb development by crosstalk among axial patterning pathways
Irene Delgado1, Miguel Torres1
1Cardiovascular Development Program, Centro Nacional de Investigaciones Cardiovasculares, CNIC, Spain.
Vertebrate limb development involves key signaling centers coordinating growth and patterning. Interactions between apical ectodermal ridge (AER), zone of polarizing activity (ZPA), and dorsal/ventral ectoderms ensure proper limb formation.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Vertebrate limb development is a complex process.
- Signaling centers control growth and patterning along three axes.
- Key signals include WNT, FGF, SHH, and BMPs.
Purpose of the Study:
- To review interactions between limb signaling centers.
- To discuss their relevance to limb growth and patterning.
- To understand the coordination of three axial systems.
Main Methods:
- Literature review of signaling pathways.
- Analysis of interactions between signaling centers.
- Focus on WNT, FGF, SHH, and BMP signaling.
Main Results:
- AER signals (WNT, FGF) promote growth and distalization.
- ZPA signal (SHH) organizes antero-posterior patterning.
- Dorsal/ventral ectoderm signals (WNT7A, BMPs) specify fates.
- Interactions coordinate axial patterning.
Conclusions:
- Signaling center interactions are crucial for limb development.
- Coordination ensures proper growth and patterning.
- Understanding these interactions aids in studying limb malformations.
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