Recording Notch signaling in real time.

Area of Science:

• Cell Biology
• Developmental Biology
• Molecular Signaling

Background:

• Notch signaling is a crucial conserved pathway regulating cell fate decisions.
• Activation involves receptor cleavage, releasing the Notch intracellular domain (ICD) into the nucleus.
• The Notch ICD interacts with CSL to modulate gene transcription.

Purpose of the Study:

• To develop a real-time, single-cell resolution assay for monitoring Notch signaling.
• To investigate the temporal and spatial dynamics of Notch pathway activation.
• To apply the assay for analyzing Notch signaling in central nervous system (CNS) progenitor cells.

Main Methods:

• Creation of a reporter construct with 12 CSL-binding motifs.
• Linkage of motifs to fluorescent proteins with distinct half-lives (DsRedExpressDR and d1EGFP).
• Real-time tracking of reporter fluorescence in individual cells upon Notch activation.

Main Results:

• The fluorescent reporters accurately reflect Notch signaling activation status at the single-cell level.
• The assay demonstrates rapid responsiveness to various Notch activation stimuli.
• Successful application of the assay to assess Notch signaling in CNS progenitor cells in vitro and in vivo.

Conclusions:

• The developed fluorescent reporter assay provides a powerful tool for real-time, high-resolution analysis of Notch signaling.
• This method enhances understanding of Notch pathway dynamics in cellular processes and development.
• The assay is valuable for studying Notch signaling in various biological contexts, including neural development.