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Related Concept Videos

Serum Studies: Renal Function Tests01:24

Serum Studies: Renal Function Tests

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Renal function tests are crucial for assessing kidney health, monitoring disease progression, and evaluating the kidneys' efficiency in waste elimination, fluid balance, and electrolyte regulation. These tests offer critical insights into kidney function, even though routine measurements may appear normal until there is a significant decline in the glomerular filtration rate or GFR. Typically, signs of kidney impairment only become evident when the GFR falls to about 50% of its normal level.
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The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
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Epidemiological study designs are fundamental tools for investigating the distribution, determinants, and control of health conditions in populations. They help researchers understand the relationships between exposures and outcomes, and they broadly fall into two categories: "observational" and "experimental" studies.
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Genetically Predicted Body Selenium Concentration and estimated GFR: A Mendelian Randomization Study.

Sehoon Park1,2, Seong Geun Kim2, Soojin Lee3,4

  • 1Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea.

Kidney International Reports
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Summary

Higher selenium levels, indicated by genetics, are linked to reduced kidney function. This Mendelian randomization study suggests a causal relationship between selenium and lower estimated glomerular filtration rate (eGFR).

Keywords:
Mendelian randomizationgenomicskidneymicronutrientselenium

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Area of Science:

  • Nutritional biochemistry and its impact on renal health.
  • Genetics and personalized medicine in relation to micronutrient metabolism.
  • Epidemiology and causal inference in chronic disease research.

Background:

  • Selenium is an essential trace mineral often found in dietary supplements.
  • The precise impact of selenium on kidney function is not fully understood.
  • Mendelian randomization (MR) offers a method to investigate causal links between nutrient levels and health outcomes like estimated glomerular filtration rate (eGFR).

Purpose of the Study:

  • To determine the causal effect of genetically predicted selenium levels on kidney function, specifically eGFR.
  • To utilize Mendelian randomization (MR) to assess the association between selenium and eGFR, accounting for potential confounders.

Main Methods:

  • Employed Mendelian randomization (MR) using 11 genetic variants for selenium levels from a genome-wide association study (GWAS).
  • Assessed the association between genetically predicted selenium and eGFR using summary statistics from the CKDGen GWAS meta-analysis (567,460 European samples).
  • Performed replication analysis on individual-level data from the UK Biobank (337,318 White individuals of British ancestry), including multivariable MR adjustments for covariates like diabetes.

Main Results:

  • Summary-level MR analysis revealed a significant inverse association: a 1 standard deviation (SD) increase in selenium concentration was linked to a 1.05% decrease in eGFR.
  • Pleiotropy-robust MR methods (MR-Egger, weighted-median) and multivariable MR adjusted for type 2 diabetes confirmed these findings.
  • Replication in the UK Biobank showed genetically predicted higher selenium concentration was significantly associated with lower eGFR (-0.36%), consistent after adjusting for BMI, hypertension, and diabetes.

Conclusions:

  • The study provides evidence supporting a causal relationship between higher genetically predicted selenium levels and reduced kidney function (lower eGFR).
  • These findings highlight a potential role for selenium in kidney health and disease.