Multi-Method Molecular Characterisation of Human Dust-Mite-associated Allergic Asthma

Area of Science:

• * Immunology
• * Molecular Biology
• * Respiratory Medicine

Background:

• * Asthma is a chronic airway inflammatory disorder with varied phenotypes.
• * Current methods for asthma phenotyping lack specific molecular markers.
• * House dust mite (HDM) allergy is a common asthma trigger, necessitating further research into its specific molecular underpinnings.

Purpose of the Study:

• * To identify phenotype-specific molecular markers in adults with poorly controlled, HDM-associated atopic asthma.
• * To characterize circulating messenger RNA (mRNA), microRNA (miRNA), and protein profiles in asthma patients compared to controls.
• * To investigate alterations in the blood microbiome composition associated with HDM-induced asthma.

Main Methods:

• * Differential expression analysis of circulating mRNA and miRNA.
• * Quantification of key inflammatory proteins (e.g., IL-4, IL-5, Total IgE) and endotoxin levels.
• * 16S rRNA sequencing to assess blood microbiome composition.

Main Results:

• * Significant alterations in circulating gene expression and regulation were observed in asthmatic subjects.
• * Increased levels of inflammatory proteins and decreased bacterial endotoxin were found in asthma patients.
• * Asthma was associated with an increased Firmicutes to Proteobacteria ratio in the blood microbiome.

Conclusions:

• * The study identified potential circulating biomarkers for HDM-associated asthma phenotyping.
• * Systemic immune activity and blood microbiome composition are altered in this asthma phenotype.
• * Findings provide a foundation for developing novel diagnostic and therapeutic strategies for asthma.