Interleukin-1 gene cluster polymorphisms predict risk of ESRD

Area of Science:

• Genetics
• Nephrology
• Immunology

Background:

• Chronic kidney disease (CKD) is characterized by an inflammatory state.
• Inflammation is modulated by genes within the interleukin-1 (IL-1) gene cluster.
• Genetic variations (polymorphisms) in this cluster may influence CKD progression to end-stage renal disease (ESRD).

Purpose of the Study:

• To investigate the association between polymorphisms in the IL-1 gene cluster and the risk of developing ESRD.
• To determine if specific genetic variations confer susceptibility to ESRD in a diverse patient cohort.

Main Methods:

• Genotyping of 239 hemodialysis patients and 252 controls for three single nucleotide polymorphisms (SNPs) in IL-1alpha and IL-1beta genes.
• Analysis of a variable-number-of-tandem-repeats (VNTR) polymorphism in the IL-1 receptor antagonist (IL-1RN) gene.
• Logistic regression was used to assess independent associations with ESRD, considering race and allele dose effects.

Main Results:

• Homozygosity for the IL-1RN VNTR allele 2 was significantly associated with ESRD risk, independent of race (P < 0.0005).
• The IL-1alpha-889 promoter SNP also showed an independent association with ESRD (P = 0.04).
• The IL-1beta-511 promoter SNP's association with ESRD was found to be dependent on race (P = 0.04).

Conclusions:

• Two polymorphisms within the IL-1 gene cluster, IL-1RN and IL-1alpha, are independently associated with ESRD risk.
• These findings represent strong genotype-ESRD associations, suggesting a role for IL-1 gene cluster variations in ESRD development.
• The study highlights the potential of genetic markers in predicting ESRD susceptibility.