Whole-Exome Sequencing of Bronchial Epithelial Cells Reveals a Genetic Print of Airway Remodelling in COPD

• Published in: Biomedicines Vol. 10; no. 7; p. 1714
• Main Authors: Germain, Adeline, Perotin, Jeanne-Marie, Delepine, Gonzague, Polette, Myriam, Deslée, Gaëtan, Dormoy, Valérian
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-07-2022; MDPI
• Subjects: airway epithelial cells; Cancer; Chronic obstructive pulmonary disease; Cilia; Communication; Comparative analysis; COPD; Copy number; Epithelial cells; Gene expression; Hyperplasia; Lasers; Life Sciences; Lung diseases; Nucleotide sequence; Obstructive lung disease; Paraffin; Respiratory diseases; Respiratory function; Respiratory tract; Respiratory tract diseases; Sequence analysis; Software; whole-exome sequencing; France; United States > US; Germany
• ISSN: 2227-9059; 2227-9059
• DOI: 10.3390/biomedicines10071714

The remodelling of the airways is a hallmark of chronic obstructive pulmonary disease, but it is highly heterogeneous and erratically distributed in the airways. To assess the genetic print of remodelling in chronic obstructive pulmonary disease (COPD), we performed a comparative whole-exome sequencing analysis on microdissected bronchial epithelia. Lung resections from four non-COPD and three COPD subjects (ex-smokers and current smokers) were formalin-fixed paraffin-embedded (FFPE). Non-remodelled and remodelled bronchial epithelia were isolated by laser microdissection. Genomic DNA was captured and sequenced. The comparative quantitative analysis identified a list of 109 genes as having variants in remodelled epithelia and 160 genes as having copy number alterations in remodelled epithelia, mainly in COPD patients. The functional analysis highlighted cilia-associated processes. Therefore, bronchial-remodelled epithelia appeared genetically more altered than non-remodelled epithelia. Characterizing the unique molecular print of airway remodelling in respiratory diseases may help uncover additional factors contributing to epithelial dysfunctions, ultimately providing additional targetable proteins to correct epithelial remodelling and improve lung function.