The different faces of shared autoimmunity

Area of Science:

• Rheumatology
• Immunology
• Genetics

Background:

• Shared autoimmunity encompasses familial rheumatic diseases, co-occurring autoimmune conditions in relatives, autoantibodies in healthy kin, and overlap syndromes within single patients.
• Genetic and environmental factors intricately interact, shaping unique patient phenotypes and disease trajectories.
• Previous research identified 23 Mexican Mestizo patients with overlap syndromes, noting distinct clinical patterns.

Purpose of the Study:

• To explore the complex interplay of genetic and environmental factors in shared autoimmunity.
• To characterize the clinical course and phenotypic variations of autoimmune overlap syndromes.
• To identify potential genetic markers influencing autoimmunity and specific disease manifestations.

Main Methods:

• Case series analysis of 23 Mexican Mestizo patients with overlap syndromes.
• Clinical observation of disease progression and manifestation patterns.
• Review of genetic factors including MHC complex genes, cytokines, AIRE, and PDCD1.

Main Results:

• Overlap syndromes exhibit diverse clinical courses, with rhupus often sequential and sclerodermatomyositis simultaneous.
• Aggressive clinical progression is noted in other overlap syndromes, with new diseases emerging during active treatment of existing ones.
• Distinct courses suggest a complex interplay between environmental triggers and predisposing genes.

Conclusions:

• The distinct clinical courses of overlap syndromes are influenced by the interaction of environmental factors with genes predisposing to autoimmunity.
• Understanding the pathophysiology requires analyzing genes such as MHC complex genes, cytokines, AIRE, and PDCD1.
• Further research into these genetic factors is crucial for comprehending the mechanisms underlying shared autoimmunity.