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Detection of Anti-MDA5 Autoantibodies Using HeLa Cells and Immunocytochemistry with Light Microscopy
Published on: October 31, 2025
MDA5 variants trade antiviral activity for protection from autoimmune disease
Chris Wallace1,2, Rahul Singh3,4, Yorgo Modis5,6
1Cambridge Institute of Therapeutic Immunology and Infectious Disease, University of Cambridge School of Clinical Medicine, Cambridge, UK. cew54@cam.ac.uk.
Abstract:
Loss-of-function variants in MDA5, a key sensor of double-stranded RNA from viruses and retroelements, have been associated with protection from type 1 diabetes (T1D) in genome-wide association studies (GWAS). MDA5 loss-of-function variants have also been reported to increase the risk of inflammatory bowel disease (IBD). Whether these associations are linked or extend to other diseases remains unclear. Here, fine-mapping analysis of four large GWAS datasets shows that T1D-protective loss-of-function MDA5 variants also protect against psoriasis and hypothyroidism, while increasing the risk of IBD. The degree of autoimmune protection and IBD risk were linearly proportional. The magnitudes of the odds ratios for autoimmune protection and IBD risk were larger for rare MDA5 variants than for common variants, which were differentially expressed in different geographic populations. Our analysis suggests MDA5 genetic variants offer a direct fitness trade-off between viral clearance and autoimmune tissue damage.
Insights
Loss-of-function variants in MDA5 offer protection against type 1 diabetes and other autoimmune diseases but increase inflammatory bowel disease risk. This suggests a trade-off between viral defense and autoimmune conditions.
Area of Science:
- Immunology
- Genetics
- Human Disease
Background:
- Loss-of-function variants in MDA5, a sensor for viral double-stranded RNA, are linked to type 1 diabetes (T1D) protection and inflammatory bowel disease (IBD) risk.
- The relationship between MDA5 variants and various autoimmune diseases remains incompletely understood.
Purpose of the Study:
- To investigate the association of MDA5 loss-of-function variants with multiple autoimmune diseases and IBD.
- To determine if T1D-protective MDA5 variants confer protection against other autoimmune conditions.
Main Methods:
- Fine-mapping analysis of four large genome-wide association study (GWAS) datasets.
- Statistical analysis of odds ratios for autoimmune protection and IBD risk associated with MDA5 variants.
Main Results:
- T1D-protective MDA5 loss-of-function variants also protect against psoriasis and hypothyroidism.
- These variants increase the risk of IBD, with a linear proportionality between autoimmune protection and IBD risk.
- Rare MDA5 variants showed larger effect sizes for both autoimmune protection and IBD risk compared to common variants.
Conclusions:
- MDA5 genetic variants present a fitness trade-off between viral clearance and autoimmune tissue damage.
- The findings highlight the complex role of MDA5 in balancing immune responses to pathogens and self-antigens.
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