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A precise group size in Dictyostelium is generated by a cell-counting factor modulating cell-cell adhesion.
C Roisin-Bouffay1, W Jang, D R Caprette
1Howard Hughes Medical Institute, Rice University, Houston, Texas 77005, USA.
Molecular Cell
|November 25, 2000
Summary
Dictyostelium cells form groups of a specific size regulated by a secreted counting factor (CF). This CF controls group size by reducing cell-cell adhesion, influencing stream breakup and aggregation size.
Area of Science:
- Cellular biology
- Developmental biology
- Biochemistry
Background:
- Dictyostelium discoideum exhibits remarkable self-organization, forming uniformly sized multicellular aggregates.
- Understanding the mechanisms that control aggregate size is crucial for developmental biology.
Purpose of the Study:
- To investigate the role of the secreted counting factor (CF) in regulating Dictyostelium cell group size.
- To elucidate the molecular mechanism by which CF influences cell aggregation.
Main Methods:
- Experimental manipulation of CF levels in Dictyostelium cultures.
- Computer simulations modeling cell-cell adhesion and aggregation dynamics.
- Analysis of aggregation stream behavior under varying CF concentrations.
Main Results:
- The secreted 450 kDa counting factor (CF) was identified as a key regulator of Dictyostelium group size.
- High CF levels decrease cell-cell adhesion, leading to the breakup of aggregation streams into smaller groups.
- Absence of CF results in high cell-cell adhesion, preventing stream breakup and forming larger groups.
Conclusions:
- CF regulates Dictyostelium group size by modulating cell-cell adhesion.
- Secreted factors that control cell adhesion may be a general mechanism for regulating multicellular group size in various organisms.