A Single-Cell Atlas of the Human Healthy Airways

Area of Science:

• Pulmonary Medicine
• Cellular Biology
• Genomics

Background:

• The human respiratory tract possesses a complex cellular ecosystem crucial for defense.
• Understanding airway cellular heterogeneity is key to respiratory health and disease.

Purpose of the Study:

• To map cell population distributions and transcriptional profiles across the human airway.
• To create a single-cell atlas of the airway epithelium from the nose to deep lung.

Main Methods:

• Single-cell RNA sequencing was performed on 77,969 cells from 35 locations in the airways of 10 healthy volunteers.
• Analysis focused on epithelial, immune, and stromal cell populations and their regional gene expression.

Main Results:

• An atlas revealed distinct proportions of epithelial, immune, and stromal cells along the airway continuum.
• Differential gene expression was observed between nasal and tracheobronchial cell types (e.g., suprabasal, secretory, multiciliated cells).
• New insights into ionocytes, pulmonary neuroendocrine cells, brush cells, and dividing/squamous cell populations were identified.

Conclusions:

• This single-cell airway atlas serves as a valuable resource for respiratory research.
• The detailed regional characterization and gene expression stability inform the development of disease models using tracheobronchial proxies.