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Updated: Nov 11, 2025
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High-speed Video Microscopy Analysis for First-line Diagnosis of Primary Ciliary Dyskinesia
Published on: January 19, 2022
4.7K
Longitudinal Lung Volume Changes by Ultrastructure and Genotype in Primary Ciliary Dyskinesia
Massimo Pifferi1, Andrew Bush2, Giuseppe Mulé1
1Department of Pediatrics.
Annals of the American Thoracic Society
|March 24, 2021
Summary
Primary ciliary dyskinesia (PCD) patients with specific defects show worsening lung volumes over time. Inner dynein arm defects and certain gene mutations indicate a poorer prognosis, impacting lung function significantly.
Area of Science:
- Pulmonary Medicine
- Genetics
- Cell Biology
Background:
- Primary ciliary dyskinesia (PCD) is a genetic disorder affecting cilia function.
- Understanding genotype-phenotype correlations in PCD is crucial for predicting disease progression.
- Longitudinal changes in lung volumes related to specific PCD defects are not well-characterized.
Purpose of the Study:
- To investigate the longitudinal changes in static lung volumes in patients with primary ciliary dyskinesia.
- To correlate these lung volume changes with specific ciliary ultrastructural defects, gene mutations, BMI, and infections.
Main Methods:
- A prospective, longitudinal study followed 122 children and adults with PCD for up to 10 years.
- Data collected included semi-annual evaluations, spirometry, plethysmography, electron microscopy (EM) for ciliary morphology, and genetic analysis.
- Linear mixed-effects models analyzed associations between ciliary defects, mutations, and clinical features.
Main Results:
- Patients with absent inner dynein arms (IDAs), central apparatus (CA) defects, or microtubular disorganization (MTD) showed significantly worse lung function at baseline compared to normal EM.
- The IDA/CA/MTD group exhibited a higher rate of increase in residual volume (RV) and worse RV/total lung capacity over time.
- Specific mutations (CCDC39, CCDC40) were linked to the steepest lung volume increases, while DNAH5 and DNAH11 mutations showed less hyperinflation. *Pseudomonas aeruginosa* infection correlated with a steeper rise in RV/total lung capacity.
Conclusions:
- Primary ciliary dyskinesia patients with IDA/CA/MTD defects or CCDC39/CCDC40 mutations experience greater hyperinflation.
- Outer dynein arm defects and DNAH5/DNAH11 mutations are associated with less severe lung volume changes.
- This study confirms a worse prognosis for certain genetic and ultrastructural defects in PCD, extending beyond spirometry findings.
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