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Related Experiment Videos

Recipient RAS gene variants and renal allograft function.

Jérôme Nicod1, Alain Richard, Felix J Frey

  • 1Division of Nephrology and Hypertension, Inselspital, University of Berne, Switzerland.

Transplantation
|March 30, 2002
PubMed
Summary

Genetic factors in the renin-angiotensin system (RAS) influence kidney transplant outcomes. The CYP11B2 genotype significantly impacts long-term renal allograft function, unlike other RAS genes.

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Area of Science:

  • Nephrology
  • Genetics
  • Immunology

Background:

  • Genetic variants of the renin-angiotensin system (RAS) are linked to native kidney disease progression.
  • Increased RAS activity, potentially genetic, is associated with reduced long-term renal allograft function.

Purpose of the Study:

  • To investigate the impact of specific renin-angiotensin system (RAS) gene polymorphisms on renal function in kidney transplant recipients.
  • To determine if angiotensinogen (AGT), angiotensin-converting enzyme (ACE), angiotensin type 1 receptor (AGT1R), and aldosterone synthase (CYP11B2) genotypes affect long-term graft function.

Main Methods:

  • Studied 223 first-kidney allograft recipients.
  • Assessed graft function via yearly serum creatinine levels.
  • Genotyped M235T-AGT, I/D-ACE, A1166C-AGT1R, and -344T/C-CYP11B2 polymorphisms using PCR.

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Main Results:

  • The CYP11B2 genotype (TT vs. CC) significantly predicted worsening renal function (P=0.002).
  • A weak association was found between AGT1R genotype and preserved graft function (P=0.037), but not AGT or ACE genotypes.
  • Lower mean blood pressure (<97 mmHg) correlated with higher rates of stable graft function up to 15 years post-transplant (60% vs. 25% with >117 mmHg).

Conclusions:

  • Renal allograft function decline is strongly linked to CYP11B2 genotype, not AGT, ACE, or AGT1R genotypes.
  • Genetic factors within the RAS play a crucial role in determining long-term renal allograft outcomes.