Non-invasive human skin transcriptome analysis using mRNA in skin surface lipids.

Area of Science:

• Dermatology
• Molecular Biology
• Biochemistry

Background:

• Non-invasive mRNA acquisition from skin is crucial for understanding skin physiology and diseases.
• The holocrine process in sebaceous glands inspired the investigation of mRNA presence in skin surface lipids (SSLs).

Purpose of the Study:

• To investigate the presence and utility of messenger RNAs (mRNAs) within skin surface lipids (SSLs) for non-invasive skin analysis.
• To explore the potential of SSL-RNA analysis for understanding skin pathophysiology, particularly in atopic dermatitis.

Main Methods:

• Modified AmpliSeq transcriptome analysis to quantify SSL-RNA levels.
• Non-invasive collection of SSL-RNAs from healthy individuals and patients with atopic dermatitis.

Main Results:

• Measurable levels of human mRNAs were detected in SSLs, protected from RNase degradation by sebum.
• SSL-RNAs primarily consisted of mRNAs from sebaceous glands, epidermis, and hair follicles.
• Analysis of atopic dermatitis patients revealed altered gene expression related to inflammation and terminal differentiation, alongside downregulated lipid synthesis genes in sebaceous glands.

Conclusions:

• SSL-RNA analysis is a promising non-invasive strategy for studying skin physiology and disease pathophysiology.
• Findings in atopic dermatitis patients highlight potential biomarkers and mechanisms relevant to the condition.