Handling difficult cryo-ET samples: A study with primary neurons from Drosophila melanogaster

Area of Science:

• Cellular neurobiology
• Structural biology
• Cryo-electron tomography

Background:

• Cryo-electron tomography (cryo-ET) has enabled significant advances in cellular neurobiology.
• Current cryo-ET studies primarily utilize rodent-derived primary neurons.
• Expanding sample models is crucial for broader structural and ultrastructural insights.

Approach:

• Established primary neurons from 3rd instar Drosophila melanogaster larval brains for cryo-ET.
• Integrated substrate selection, micropatterning, montage data collection, and chemical fixation to optimize samples.
• Addressed and overcame ultrastructural abnormalities like membrane blebbing and cellular fragmentation.

Key Points:

• Successfully adapted Drosophila neurons for cryo-electron tomography (cryo-ET) analysis.
• Developed optimized protocols for sample preparation and data acquisition.
• Identified and mitigated common ultrastructural challenges in insect neuronal samples.

Conclusions:

• This work provides a foundation for using Drosophila neurons in cryo-ET studies.
• The optimized methods offer valuable insights for establishing other cell-based model systems for cryo-ET.
• Expands the toolkit for high-resolution structural and ultrastructural investigations in neurobiology.