Protocol for preparation of heterogeneous biological samples for 3D electron microscopy: a case study for insects

Area of Science:

• Biological sciences
• Microscopy
• Structural biology

Background:

• Three-dimensional electron microscopy (3D-EM) offers advanced insights into biological structures.
• Current limitations include challenging sample preparation, especially for heterogeneous tissues, requiring specialized equipment and time.

Purpose of the Study:

• To develop a simplified protocol for preparing heterogeneous biological samples for 3D-EM.
• To enable detailed 3D ultrastructural analysis of complex biological specimens.

Main Methods:

• A novel, simple sample preparation protocol adaptable to standard laboratory equipment.
• Integration with focused ion-beam scanning electron microscopy (FIB-SEM) for high-resolution imaging.

Main Results:

• Successful preparation of heterogeneous biological samples for 3D-EM.
• Demonstrated ability to study the entire volume of complex samples, such as insect heads, at cellular and subcellular resolution.

Conclusions:

• The developed protocol significantly reduces barriers to using 3D-EM for heterogeneous samples.
• This advancement provides new opportunities for research in connectomics and other areas requiring detailed ultrastructural analysis.