Related Experiment Videos
Numb: "Adapting" notch for endocytosis.
Hamed Jafar-Nejad1, Koenraad Norga, Hugo Bellen
1Howard Hughes Medical Institute, Department of Molecular and Human Genetics, Houston, TX 77030, USA.
Developmental Cell
|August 27, 2002
Summary
The numb protein in Drosophila sensory organ development physically interacts with alpha-Adaptin. This interaction is crucial for downregulating Notch signaling, likely by promoting Notch receptor endocytosis.
Area of Science:
- Cell Biology
- Developmental Biology
- Genetics
Background:
- During asymmetric cell division in Drosophila sensory organ precursors, the numb gene product dictates cell fate by inhibiting Notch signaling.
- Understanding the molecular mechanisms underlying numb's function is key to deciphering cell fate determination.
Purpose of the Study:
- To investigate the molecular interactions of the numb protein.
- To elucidate the mechanism by which numb inhibits Notch signaling during Drosophila development.
Main Methods:
- Co-immunoprecipitation assays to detect protein-protein interactions.
- Analysis of Numb and alpha-Adaptin localization in Drosophila sensory organ precursors.
- Functional assays assessing Notch signaling in the presence of Numb and alpha-Adaptin interactions.
Main Results:
- Numb physically interacts with alpha-Adaptin.
- This interaction is essential for the downregulation of Notch signaling.
- The Numb-alpha-Adaptin complex is implicated in stimulating the endocytosis of the Notch receptor.
Conclusions:
- Numb recruits alpha-Adaptin to mediate the downregulation of Notch signaling.
- Endocytosis, stimulated by the Numb-alpha-Adaptin complex, is a key mechanism for Notch inhibition.
- This study reveals a novel molecular pathway for cell fate determination in Drosophila sensory organ development.
Keywords:
Non-programmatic