DIF signalling and cell fate
R R Kay1, P Flatman, C R Thompson
1MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH, UK.
Seminars in Cell & Developmental Biology
|March 9, 2000
Summary
DIFs, chlorinated molecules, regulate Dictyostelium cell fate by inducing stalk cell differentiation. DIF-1 is synthesized in prespore cells and inactivated in prestalk cells, guiding cell-type proportioning.
Area of Science:
- Cell Biology
- Developmental Biology
- Biochemistry
Background:
- Dictyostelium discoideum serves as a model organism for studying cellular differentiation.
- Secreted factors, known as Differentiation Inducing Factors (DIFs), play a crucial role in regulating cell fate decisions during development.
Purpose of the Study:
- To elucidate the roles of DIFs in Dictyostelium cell fate determination.
- To investigate the biosynthetic and inactivation pathways of DIF-1, the primary bioactive DIF molecule.
Main Methods:
- Analysis of cell differentiation in Dictyostelium cultures.
- Biochemical assays to study the synthesis and degradation of DIF-1.
- Cell-type specific localization studies.
Main Results:
- DIFs were identified as secreted chlorinated molecules controlling cell fate.
- DIF-1 induces stalk cell differentiation and suppresses spore cell formation.
- DIF-1 is synthesized in prespore cells and inactivated (dechlorinated) in prestalk cells.
Conclusions:
- A reciprocal signaling model is proposed where DIF-1 levels are modulated by each cell type to promote the differentiation of the other.
- This mechanism is crucial for establishing correct cell-type proportions during Dictyostelium development.
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