Decoding autoimmune bullous diseases from single-cell RNA-seq and future directions.

INTRODUCTION: Autoimmune bullous diseases (AIBDs) are a group of disorders caused by autoantibody-mediated damage to the skin and mucous membranes. Although AIBDs share immune-mediated mechanisms of epithelial disruption or basement membrane integrity, the precise cellular dynamics and molecular driver remain incompletely understood, hindering the development of targeted therapies.

AREAS COVERED: In this review, we synthesize the cutting-edge findings from scRNA-seq studies (1978-2024) investigating AIBDs heterogeneity, focusing on pemphigus and bullous pemphigoid. Our analysis highlights how scRNA-seq has revealed disease-specific cell subpopulations, dysregulated cytokine/chemokine networks, and pathogenic intercellular crosstalk mechanisms.

EXPERT OPINION: While scRNA-seq has significantly advanced our understanding of AIBDs pathophysiology by resolving cellular heterogeneity and dysregulated immune crosstalk, technical limitations persist. Challenges include the scarcity of high-quality clinical specimens, insufficient spatial resolution for microenvironmental mapping, and unvalidated functional significance of transcriptomic signatures. To address these limitations and advance the field, future research should focus on the integration of multi-omics approaches, spatial transcriptomics, and AI-driven analysis, which will enable comprehensive mapping of dynamic disease trajectories and identification of novel therapeutic targets. Translationally, validating scRNA-seq-predicted biomarkers in longitudinal cohorts will be critical for advancing precision medicine in these complex disorders.