Protocol for Imaging the Same Class IV Neurons at Different Stages of Development

Area of Science:

• Neuroscience
• Developmental Biology
• Cell Biology

Background:

• Drosophila class IV neurons possess complex, branching dendritic arbors that tile the larval body.
• These arbors undergo significant structural transformations during larval development.
• Previous observations suggested potential growth via branch dilation, similar to class I neurons.

Purpose of the Study:

• To develop a systematic protocol for quantitatively assessing the growth dynamics of internal branches in Drosophila class IV neurons.
• To investigate whether the complex arbor structure arises from branch dilation or tip growth.

Main Methods:

• Utilizes live imaging of the same Drosophila neuron across different developmental time points.
• Employs the ppkCD4-tdGFP genotype to specifically tag class IV neurons in Drosophila embryos and larvae.
• Adapts agar pad preparation for mounting and imaging Drosophila larvae, enabling anesthetic-free, short-duration imaging with a spinning disk confocal microscope.

Main Results:

• The protocol allows for the quantitative assessment of internal branch growth dynamics.
• Enables detailed observation of dendritic arbor expansion relative to larval segment growth.
• Provides insights into the mechanisms of complex arbor formation in class IV neurons.

Conclusions:

• The developed protocol offers a robust method for studying neuronal growth dynamics in vivo.
• Facilitates a deeper understanding of how intricate neuronal structures are established during development.
• Contributes to the study of cellular morphogenesis and tissue development in Drosophila.