Systemic sclerosis pathogenesis: contribution of recent advances in genetics

Area of Science:

• Immunogenetics
• Rheumatology
• Genomics

Background:

• Systemic sclerosis (SSc) is a rare autoimmune disease characterized by vasculopathy, immune dysregulation, and fibrosis.
• Genetic studies, including Genome-Wide Association Studies (GWAS) and ImmunoChip studies, have identified genetic variants associated with SSc.
• These variants are predominantly found in noncoding regions and impact various aspects of the immune system.

Purpose of the Study:

• To review susceptibility genes for SSc.
• To understand how these genes integrate into SSc pathophysiology.
• To provide insights for developing innovative therapies.

Main Methods:

• Review of recent Genome-Wide Association Studies (GWAS) and ImmunoChip studies.
• Analysis of identified genetic variants in innate immunity, T and B cell activation, and NF-κB pathways.
• Consideration of genes affecting vascular and fibrotic components.

Main Results:

• Genetic variants in innate immunity (e.g., IRF5, TLR2), T/B cell activation (e.g., CD247, STAT4), and NF-κB pathway (e.g., TNFAIP3) are associated with SSc.
• Genes such as CSK, DDX6, DNASE1L3, and GSDMA/B may also contribute to the vascular and fibrotic aspects of SSc.
• These findings confirm and expand upon previous biological data regarding SSc pathogenesis.

Conclusions:

• Genetic studies underscore the role of immune dysregulation in SSc.
• Future research should focus on functional characterization of identified variants and their impact on vasculopathy and fibrosis.
• Integrated genomic approaches, such as polygenic risk scores, could identify novel therapeutic targets for SSc clinical features.