Identification of genes conferring individual-level variation responsible for metabolic dysfunction-associated steatohepatitis using single-cell eQTL analysis
Hong, S. E.; Mun, S. J.; Lee, Y. J.; Yoo, T.; Suh, K.-S.; Kang, K. W.; Son, M. J.; Kim, W.; Choi, M.
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Metabolic dysfunction-associated steatotic liver disease (MASLD) is increasingly recognized for its medical and socioeconomic impacts, driven by diverse genetic and environmental factors. To address the urgent need for individually tailored therapies, we performed single-cell expression quantitative trait loci (sc-eQTL) analysis on liver biopsies from 25 MASLD patients and 23 controls. This approach identified over 3,500 sc-eQTLs across major liver cell types and cell state-interacting eQTLs (ieQTLs) with significant enrichment for disease heritability (for MASLD trait, ieQTL enrichment odds ratio = 10.27). We integrated transcription factors (TFs) as upstream regulators of ieQTLs, revealing 601 functional units ("quartets") composed of TFs, cell states, ieSNPs, and ieGenes. From these results, we pinpoint the loss of an eQTL in EFHD1 during hepatocyte maladaptation associated with genotype-specific regulation by FOXO1, further contributing to the risk of MASLD. Our approach underscores the role of eQTL analysis in capturing crucial genetic variations that influence gene expression and clinical outcomes in complex diseases.
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