DNAH9 variants in children with post-infectious bronchiolitis/bronchitis obliterans

Area of Science:

• Genetics
• Pulmonology
• Pediatrics

Background:

• Post-infectious bronchiolitis/bronchitis obliterans (PIBO) is a chronic obstructive lung disease affecting small airways.
• Previous research suggests a link between PCD-related gene mutations and PIBO.
• The specific role of DNAH9 variants in PIBO pathogenesis is not well understood.

Purpose of the Study:

• To investigate the association between DNAH9 gene mutations and the incidence of PIBO in a pediatric cohort.
• To identify and characterize DNAH9 variants in patients diagnosed with PIBO.
• To explore the clinical and genetic factors contributing to PIBO development.

Main Methods:

• Whole Exome Sequencing (WES) was performed on 126 PIBO patients to identify DNAH9 variants.
• Detailed clinical information, high-resolution CT, and/or electronic bronchoscopy data were collected for pediatric patients with DNAH9 variants.
• Bioinformatic analysis was used to predict the pathogenicity of identified DNAH9 variants.

Main Results:

• Twelve variants in the DNAH9 gene were identified across six pediatric PIBO patients, including compound heterozygous mutations.
• The identified variants comprised two nonsense, two splice site, and eight missense mutations.
• All variants had low allele frequencies and were predicted as variants of uncertain significance or deleterious.

Conclusions:

• Compound complex variants in the DNAH9 gene may play a role in the development of PIBO.
• PIBO in these pediatric patients followed severe Mycoplasma pneumoniae and/or adenoviral pneumonia.
• Further research is warranted to elucidate the precise mechanisms linking DNAH9 variants to PIBO.