An Innovative Transmission Electron Microscopy-Based Ultrastructural Imaging Methodology for the Diagnosis of...

Area of Science:

• Biomedical Imaging
• Cell Biology
• Diagnostic Pathology

Background:

• Transmission electron microscopy (TEM) is crucial for diagnosing ciliary disorders.
• Current TEM methods face challenges due to sample heterogeneity, low cell yield, and improper fixation.
• Difficulties in achieving optimal ciliary ultrastructure hinder accurate diagnosis.

Purpose of the Study:

• To optimize sample collection and preparation techniques for TEM.
• To improve the yield and quality of ciliary ultrastructure for diagnosis.
• To enhance the diagnostic accuracy of ciliary disorders using TEM.

Main Methods:

• Optimized nasal sample collection including pre-cleaning, multiple brush changes, and paired collections.
• Improved primary fixation protocols to preserve ciliary ultrastructure.
• Modified ultra-sectioning with sample tilting (α axes ±40°, β axes ±25°) to enhance cilia visibility.

Main Results:

• Achieved up to 32-fold increase in ciliary epithelial cell yield.
• Obtained approximately 20-fold more reportable cilia ultrastructures (e.g., 9+2 pattern, dynein arms).
• Increased diagnostic accuracy for ciliary disorders from 5% to 67% in 135/200 patients.

Conclusions:

• The optimized TEM protocol significantly improves diagnostic yield for ciliary disorders.
• This enhanced conventional method achieves accuracy comparable to advanced cryo-electron tomography.
• The refined methodology offers a more reliable approach for diagnosing primary ciliary dyskinesia and related conditions.