Association of ENOS polymorphism with basal peritoneal membrane function in uremic patients

Area of Science:

• Nephrology
• Genetics
• Peritoneal Dialysis

Background:

• Basal peritoneal permeability significantly impacts peritoneal dialysis (PD) patient outcomes.
• Nitric oxide (NO) activity is suggested to influence peritoneal permeability.
• A gene polymorphism in the endothelial NO synthase (ENOS) gene has been linked to circulating nitrate levels.

Purpose of the Study:

• To investigate the association between the ENOS4(a/b) gene polymorphism and basal peritoneal function in incident PD patients.
• To determine if ENOS genotype is an independent predictor of peritoneal transport.

Main Methods:

• Cross-sectional study of 86 Chinese incident PD patients.
• Identification of ENOS genotypes (variable number tandem repeats in intron 4 (a/b)) using polymerase chain reaction.
• Classification of patients into low/low average (L/LA) and high/high average (H/HA) peritoneal equilibration test (PET) groups.

Main Results:

• A higher prevalence of ENOS aa/ab genotype and a allele was observed in the low/low average PET group (Group A) compared to the high/high average PET group (Group B).
• ENOS genotype was an independent predictor of peritoneal transport after multivariate analysis.
• Patients with the aa/ab genotype exhibited significantly lower mass transfer area coefficients and dialysate-plasma creatinine ratios at 4 hours compared to those with the bb genotype.

Conclusions:

• The ENOS4(a/b) gene polymorphism is associated with basal peritoneal permeability in uremic Chinese patients.
• This genetic variation may play a role in determining peritoneal transport characteristics in PD patients.