Immune Markers Mediate Genetic Relationships between Immune Diseases and Psychiatric Disorders
Breunig, S.; Kelly, K. M.; Schaffer, L. S.; Lawrence, J. M.; Lee, Y. H.; Karlson, E. W.; Grotzinger, A. D.
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This study explored the genetic links between 11 immune-mediated diseases and 13 psychiatric disorders, addressing the limited understanding of what links these illnesses. Utilizing genomic structural equation modeling, we investigated whether 14 immune markers (e.g., C-reactive protein [CRP], interleukin-6 [IL-6]) mediated associations between latent genomic factors of immune-mediated diseases (e.g., autoimmune) and psychiatric disorders (e.g., internalizing). While the literature extensively describes the psychiatric relevance of CRP, results indicated this is better explained by its biological precursor, IL-6. Six immune markers significantly mediated 11 psychiatric-immune disease genetic relationships. For example, IL-6 mediated 60% of the genetic link between an internalizing factor and Crohns disease. Identified markers often evinced mediating effects for multiple disorder clusters, while at the same time showing some specificity in their associations. These findings provide mechanistic insight by pinpointing the immune markers that may be most critical to the psychiatric-immune disease link, which notably did not include CRP.
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