Genetically-encoded markers for confocal visualization of single dense core vesicles.

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• Neuronal dense core vesicles (DCVs) are crucial for storing and releasing various signaling molecules.
• Current methods like electron microscopy limit the analysis of individual DCVs, hindering research into cargo segregation and vesicle heterogeneity.

Purpose of the Study:

• To develop novel genetically encoded markers for visualizing and analyzing single DCVs.
• To enable high-resolution imaging of DCVs using accessible microscopy techniques in Drosophila.

Main Methods:

• Development of genetically encoded markers for DCVs.
• Application of standard immunohistochemistry and expansion microscopy techniques.
• Confocal microscopy for single-vesicle resolution imaging in Drosophila.

Main Results:

• Successful creation of genetically encoded markers for DCVs.
• Demonstration of single-vesicle resolution analysis of DCVs using confocal microscopy.
• Overcoming limitations of electron microscopy for studying DCV heterogeneity.

Conclusions:

• The developed markers provide a powerful new tool for studying DCV function and cargo.
• This approach facilitates detailed analysis of DCV heterogeneity and dynamics in vivo.
• Enables advancements in understanding neuronal signaling and molecular transport mechanisms.