Innovations in cryo-electron tomography for tissues: Challenges and future prospects

Area of Science:

• Structural Biology
• Biomedical Research
• Cell Biology

Background:

• Cryo-electron tomography (cryo-ET) excels at in situ structural analysis of single cells.
• Tissue thickness has historically limited cryo-ET applications in complex biological samples.
• Overcoming these limitations is crucial for advancing cellular and tissue-level structural understanding.

Purpose of the Study:

• To review recent technological advancements in cryo-ET for tissue analysis.
• To highlight the implications of these advances for structural biology and biomedical research.
• To discuss the future potential of cryo-ET in studying cellular structures within tissues.

Main Methods:

• Cryo-electron tomography (cryo-ET)
• Cryo-focused ion beam (cryo-FIB) milling
• Advanced sample vitrification and lift-out techniques
• Integration of automation and AI in imaging workflows

Main Results:

• Substantial improvements in preparing thin, electron microscopy-compatible tissue samples.
• Streamlined imaging and data analysis through automation and complementary modalities.
• Enabling high-resolution structural insights into intact biological tissues.

Conclusions:

• Technological progress has made cryo-ET a viable tool for tissue-level structural analysis.
• Cryo-ET is poised to significantly impact structural biology and biomedical research by revealing cellular architecture in situ.
• Future applications promise deeper understanding of biological processes at the tissue level.