Insights into the pathogenesis of rheumatic and immune diseases from single-cell omics.

High-resolution, high-throughput single-cell omics has transformed our understanding of autoimmune disease pathogenesis. We synthesise recent single-cell omics advances across six autoimmune diseases-systemic sclerosis, systemic lupus erythematosus, Sjögren's syndrome, ankylosing spondylitis, IgG4-related disease and rheumatoid arthritis. We further summarise translational progress in targeted therapies. We delineate core pathological networks shared across these conditions, highlight convergent mechanisms, and provide a mechanistic rationale for the clinical activity of agents such as tofacitinib and abatacept across multiple autoimmune settings. These insights support the feasibility of mechanism-informed, cross-disease targeting-deploying shared pathway interventions across distinct clinical entities. Finally, we discuss current technical and interpretative challenges and outline future directions for mechanistic discovery, target prioritisation and precision medicine.