Do UMOD rs12917707 (G) and SHROOM3 rs17319721 (A) genotypes increase risk of lower eGFR and CKD?

Large-scale genomic studies and consortium analyses have robustly linked specific variants in the UMOD and SHROOM3 genes to variations in kidney function and long-term renal health. These associations are consistent across diverse populations, identifying these loci as key genetic determinants of estimated glomerular filtration rate (eGFR) and chronic kidney disease (CKD) susceptibility.

UMOD rs12917707 and renal function

The G (risk) allele of UMOD rs12917707 is strongly associated with reduced eGFR and a higher prevalence of CKD.

• Clinical Evidence: Genome-wide association studies (GWAS) consistently demonstrate that this variant has a significant effect size on kidney function markers. In various cohorts, the G allele correlates with lower baseline eGFR and an increased risk of developing clinical CKD over time.
• Mechanistic Basis: The rs12917707 G allele acts as a cis-regulatory element in the UMOD promoter, significantly upregulating the transcription of uromodulin (Tamm-Horsfall protein). Elevated uromodulin levels in the thick ascending limb of Henle's loop lead to the over-activation of the Na-K-2Cl cotransporter (NKCC2) and the NaCl cotransporter (NCC). This cascade promotes salt-sensitive hypertension and chronic pressure-related renal damage.

SHROOM3 rs17319721 and fibrotic risk

The SHROOM3 rs17319721 A allele is a recognized risk factor for impaired kidney function and progressive renal decline.

• Clinical Evidence: Data from the CKDGen Consortium and studies in Asian populations link the A allele to a higher likelihood of eGFR falling below 90 mL/min/1.73 m² (OR: 1.12). It is also strongly associated with renal allograft fibrosis.
• Mechanistic Basis: This variant is located within an intronic enhancer where the risk allele increases SHROOM3 expression. High levels of SHROOM3 in the tubular compartment activate the TGF-β signaling pathway, which facilitates renal fibrosis and the architectural changes characteristic of CKD progression.

Bottom line

• The UMOD rs12917707 (G) and SHROOM3 rs17319721 (A) genotypes are independently associated with lower eGFR and increased CKD risk, driven by genetically mediated salt-handling dysregulation and pro-fibrotic signaling.