Identification of Genetic Markers Linked to The Activity of Indoleamine 2,3-Dioxygenase and Kidney Function.
Level 3 - non-randomized controlled study
Cohort-based genetic association and eQTL analysis
PubMed 37110199 · doi:10.3390/metabo13040541
What was done
Researchers conducted a coincident genetic association analysis to investigate the relationship between indoleamine 2,3-dioxygenase (IDO) activity and chronic kidney disease (CKD) using data from the Korea Association REsource (KARE) cohort. Linear and logistic regression models evaluated associations between single nucleotide polymorphisms (SNPs), IDO activity, and estimated glomerular filtration rate (eGFR). Expression quantitative trait loci (eQTL) analysis was performed to determine whether candidate variants altered gene expression in human tissues.
What was found
Ten SNPs demonstrated concurrent associations with both IDO activity and CKD at p < 0.001. Three candidate loci were prioritized: rs6550842, rs77624055, and rs35651150. eQTL analysis showed that rs6550842 and rs35651150 significantly altered the tissue expression of NKIRAS1 and SH2D4A, respectively. NKIRAS1 and BMP6 were highlighted as candidate genes linking IDO activity and CKD through inflammatory signaling pathways. Exact effect sizes and odds ratios were not reported in the abstract.
Why it matters
This work identifies shared genetic markers linking tryptophan-kynurenine metabolism (via IDO activity) to kidney dysfunction, pointing to NKIRAS1, SH2D4A, and BMP6 as potential candidate genes involved in inflammatory pathways of CKD.
Limits
The total sample size, regression coefficients, and exact effect estimates are omitted from the abstract. The study relies on a single population cohort (KARE), limiting generalizability to other ancestral groups. Statistical and eQTL associations demonstrate correlation but do not establish mechanistic causality.
Cited by
- supports Specific genetic polymorphisms can increase activity along the kynurenine metabolic pathway.