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Segregation of rhombomeres by differential chemoaffinity
1Department of Developmental Neurobiology, UMDS, Guy's Hospital, London, England.
Molecular and Cellular Neurosciences
|January 1, 1997
Summary
Hindbrain development involves distinct cell affinities between rhombomeres, crucial for maintaining positional information. This selective cell adhesion, mediated by calcium-dependent molecules, ensures proper compartmentalization of the central nervous system.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- The developing hindbrain is segmented into rhombomeres, which are key structural units.
- Rhombomeres exhibit differential gene expression and neuronal differentiation patterns.
- Cells are restricted to individual rhombomeres after their formation.
Purpose of the Study:
- To investigate the mechanisms underlying cell restriction within rhombomeres.
- To determine if differential cell affinities play a role in hindbrain compartmentalization.
- To understand how anteroposterior positional information is maintained.
Main Methods:
- Isolation and aggregation of rhombomere cells in short-term cultures.
- Assessment of aggregate composition to analyze cell sorting and segregation.
- Inactivation of calcium-dependent and calcium-independent adhesion molecules.
Main Results:
- Cells from even-numbered rhombomeres selectively sort out from odd-numbered rhombomeres.
- A lesser degree of segregation was observed between cells of the same parity (even/even or odd/odd).
- Selective cell segregation was abolished upon inactivation of calcium-dependent adhesion molecules.
Conclusions:
- Differential cell affinity restricts cell mixing between adjacent rhombomeres.
- Calcium-dependent adhesion molecules are critical for this region-specific cell segregation.
- Cell adhesion mechanisms are vital for establishing hindbrain compartments and maintaining positional information.