The impact of mannose-binding lectin polymorphisms on lung function in primary ciliary dyskinesia

Area of Science:

• Immunology
• Pulmonology
• Genetics

Background:

• Primary ciliary dyskinesia (PCD) is a genetic disorder causing chronic lung infections and progressive lung damage.
• Mannose-binding lectin (MBL) is crucial for innate immunity, and MBL2 gene variations can lead to insufficient MBL levels.
• MBL insufficiency is associated with increased infection risk and lung function decline in cystic fibrosis.

Purpose of the Study:

• To investigate the association between MBL2 genotype and disease progression in patients with PCD.
• To determine if MBL deficiency impacts age at diagnosis, lung function decline, or infection rates in PCD.

Main Methods:

• Retrospective longitudinal study of 85 PCD patients.
• Data collected included diagnostics, age at diagnosis, spirometry, and Pseudomonas aeruginosa infection status.
• Patients were genotyped for MBL2 sufficiency or deficiency.

Main Results:

• MBL-deficient patients were diagnosed significantly earlier (median 6.1 vs. 8.9 years).
• MBL-deficient patients exhibited a steeper decline in forced expiratory volume in one second (FEV1) over time compared to MBL-sufficient patients.
• No significant differences were observed in forced vital capacity (FVC), FEV1/FVC ratio, or infection status.

Conclusions:

• MBL deficiency, linked to MBL2 mutations, is associated with earlier diagnosis and accelerated FEV1 decline in PCD.
• The MBL genotype may function as a disease modifier in primary ciliary dyskinesia.