A Transcriptomic Method to Determine Airway Immune Dysfunction in T2-High and T2-Low Asthma

Area of Science:

• Immunology
• Respiratory Medicine
• Genomics

Background:

• Type 2 (T2) inflammation is a key driver of airway dysfunction in asthma, but the underlying immune cell types and networks are not fully understood.
• Immune system defects in non-T2 asthma remain poorly defined.

Purpose of the Study:

• To identify gene networks sustaining T2 airway inflammation in T2-high asthma.
• To characterize gene networks associated with T2-low asthma.

Main Methods:

• Network analysis of sputum cell transcriptome data from 84 asthma patients and 27 healthy controls.
• Identification of immune cell type-enriched networks to define asthma subgroups.

Main Results:

• T2 inflammation involves innate immune cells (eosinophils, mast cells, dendritic cells).
• Asthma subgroups (T2-high, T2-low) were identified, with a distinct T2-ultrahigh group showing severe obstruction.
• T2-low asthma was characterized by reduced cytotoxic CD8+ T-cell networks, linked to BMI and IL-6.

Conclusions:

• Airway T2 inflammation is a variable network of innate and adaptive immunity, persisting despite treatment.
• T2-low asthma is associated with a cytotoxic T-cell deficiency and obesity-driven inflammation.