Respiratory motile cilia dysfunction in a patient with cranioectodermal dysplasia

Area of Science:

• Genetics
• Cell Biology
• Respiratory Medicine

Background:

• Ciliopathies, including cranioectodermal dysplasia, often present with respiratory issues linked to rib cage abnormalities.
• Primary cilia defects are known in these conditions, but motile cilia involvement in airway disease is less understood.

Observation:

• A patient with cranioectodermal dysplasia exhibited newborn respiratory distress, restrictive airway disease, and recurrent infections.
• Nasal epithelial biopsy revealed immotile/dyskinetic cilia and reduced nitric oxide, characteristic of primary ciliary dyskinesia.
• Exome sequencing identified compound heterozygous WDR35 mutations, but no mutations in known primary ciliary dyskinesia genes.

Findings:

• WDR35 deficiency was shown to disrupt ciliogenesis in human respiratory epithelia.
• This indicates WDR35 is essential for the formation of motile cilia in the airway.
• The study links WDR35 mutations to airway mucociliary clearance defects.

Implications:

• WDR35 mutations may cause a mucociliary clearance defect that can be masked by restrictive airway disease in patients.
• This expands the understanding of ciliopathies and their respiratory manifestations.
• Highlights the dual role of WDR35 in both primary and motile cilia function.