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Cleavage and secretion is not required for Four-jointed function in Drosophila patterning
Helen Strutt1, Jenifer Mundy, Katrina Hofstra
1Centre for Developmental Genetics, Department of Biomedical Science, University of Sheffield, Western Bank, Sheffield S10 2TN, UK.
Development (Cambridge, England)
|February 6, 2004
Summary
The Four-jointed (fj) protein, crucial for Drosophila development, functions within the Golgi apparatus. Golgi-anchored fj shows enhanced activity, suggesting it regulates Fat and Dachsous proteins.
Area of Science:
- Developmental Biology
- Cell Biology
- Genetics
Background:
- The Four-jointed (fj) protein is essential for proximodistal growth and planar polarity in Drosophila.
- Fj is a type II transmembrane protein with a secreted C terminus, previously hypothesized to be a secreted signaling molecule.
Purpose of the Study:
- To investigate the subcellular localization and function of the Four-jointed (fj) protein.
- To determine if Fj's secretion is necessary for its activity.
- To explore the interaction between fj, fat (ft), and dachsous (ds) in tissue patterning.
Main Methods:
- Immunolocalization of Fj protein in Drosophila imaginal discs and transfected cells.
- Functional assays of constitutively secreted or Golgi-anchored Fj mutants in vivo.
- Genetic interaction studies between fj, ft, and ds.
Main Results:
- Fj protein exhibits a graded distribution and is primarily localized to the Golgi apparatus.
- Cleavage and secretion of Fj are not required for its biological activity.
- Golgi-anchored Fj demonstrates enhanced activity compared to wild-type.
- fj shows genetic interactions with ft and ds in planar polarity and proximodistal patterning.
Conclusions:
- Fj's function in Drosophila development is associated with its Golgi localization, not necessarily its secretion.
- Fj may act within the Golgi to modulate the activity of Fat and Dachsous proteins.
- This study refines the understanding of Fj's role in developmental patterning.