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Published on: May 5, 2014
Gene-gene interactions in APOL1-associated nephropathy
Jasmin Divers1, Nicholette D Palmer, Lingyi Lu
1Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA.
Genetic variants in NPHS2, SDCCAG8, and near BMP4 interact with APOL1 to modify the risk of non-diabetic end-stage kidney disease (ESKD) in African Americans. These findings identify key genetic modifiers for ESKD risk.
Area of Science:
- Nephrology
- Genetics
- Epidemiology
Background:
- Two APOL1 variants significantly increase non-diabetic end-stage kidney disease (ESKD) risk in African Americans (AAs).
- Not all individuals with high-risk APOL1 genotypes develop ESKD, suggesting modifying factors are involved.
- Investigating interactions between APOL1 and other genetic variants can elucidate ESKD risk modulation.
Purpose of the Study:
- To identify single nucleotide polymorphisms (SNPs) that interact with APOL1 to modify the risk of non-diabetic nephropathy.
- To analyze the impact of these interactions on ESKD, kidney function, and albuminuria.
Main Methods:
- Examined 42 potentially interactive SNPs in 1367 AA non-diabetic ESKD cases and 1504 controls.
- Validated findings in an independent family-based cohort.
- Utilized logistic regression and mixed models to test for APOL1 interaction effects.
Main Results:
- Significant APOL1 interactions were observed with SNPs in NPHS2 (podocin), SDCCAG8, and near BMP4.
- The NPHS2 SNP (rs16854341) reduced the APOL1-ESKD odds ratio by approximately 50%.
- Interactions with NPHS2 and SDCCAG8 SNPs also showed effects on albuminuria in family-based samples.
Conclusions:
- Variants in NPHS2, SDCCAG8, and near BMP4 interact with APOL1.
- These interactions modulate the risk for non-diabetic end-stage kidney disease in African Americans.
- Identifying these genetic modifiers offers insights into personalized risk assessment for ESKD.
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