Novel loci and multi-omics risk models for rheumatoid arthritis through a million-participant genome-wide association meta-analysis
Velazquez Silva, G. L.; Dzigurski, J.; Vosa, U.; Taba, N.; Märtson, A.; Tootsi, K.; Ulst, K.; Müller, R.; Estonian Biobank Research Team, ; Org, E.; Laisk, T.; Mägi, R.; Läll, K.; Reimann, E.
Show abstract
Rheumatoid arthritis (RA) remains incompletely understood, limiting targeted prevention. In this work, genome-wide association study meta-analyses were performed for RA and seropositive RA, comprising approximately one million participants of European ancestry. Eight and six novel genomic risk loci were defined for RA and seropositive RA, and candidate causal genes were identified, highlighting relevant biological pathways, including established immune pathways and estrogen metabolism. Novel disease-specific polygenic risk scores (PRSs) were constructed, enhancing predictive performance over clinical risk factors (incremental C-statistics of 2.7 and 5.1 for RA and seropositive RA, respectively). In parallel, integrating metabolomic data into high-dimensional models enhanced risk stratification over models based on clinical risk factors and genomics, particularly for seropositive RA, where the hazard ratio of the highest decile increased from 4.869 to 5.697. These findings expand the understanding of genetic factors underlying RA and support the value of including PRSs in risk assessment, while suggesting metabolomic integration may further enhance risk stratification, particularly for seropositive RA.
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