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Gout: Genes that Affect Urate Levels and Gout Development

The SLC2A9 gene provides instructions for making a protein called glucose transporter 9 (GLUT9). This protein is found mainly in the kidneys, specifically in structures called proximal tubules. These structures help to reabsorb needed nutrients, water, and other materials into the blood and excrete unneeded substances into the urine. Within the proximal tubules, the GLUT9 protein helps reabsorb or excrete a substance called urate. Urate is a byproduct of certain normal biochemical reactions in the body. In the bloodstream it acts as an antioxidant, protecting cells from the damaging effects of unstable molecules called free radicals. When more urate is needed in the body, the GLUT9 protein helps reabsorb it into the bloodstream. Most urate that is filtered through the kidneys is reabsorbed into the bloodstream; about 10 percent is released into urine.

The GLUT9 protein also plays a role in reabsorbing and excreting the simple sugar glucose.


Renal Hypouricemia

At least 17 mutations in the SLC2A9 gene have been found to cause renal hypouricemia. This condition results in a reduced amount of urate in the blood. Renal hypouricemia often does not cause any health problems but can lead to kidney stones, blood in the urine (hematuria), or pain and nausea after exercise. Most of the mutations that cause renal hypouricemia replace single protein building blocks (amino acids) in the GLUT9 protein and severely reduce or eliminate the protein's ability to reabsorb urate into the bloodstream. As a result, an excessive amount of urate is lost through the urine. While it is not clear how these changes in urate levels lead to the signs and symptoms of renal hypouricemia, it is likely that the loss of urate's antioxidant properties in combination with the increase in urate passing through the kidneys to be released in the urine contribute to the characteristic features of this condition.


Genetic changes in the SLC2A9 gene are associated with a condition called gout, which is a form of arthritis. Gout develops when elevated urate levels in the blood (hyperuricemia) lead to the formation of urate crystals in joints, triggering an inflammatory response from the immune system.

SLC2A9 gene changes associated with gout likely increase the production of a form of the GLUT9 protein that is 28 amino acids shorter than the full-length version. This shorter version of GLUT9 reabsorbs urate into the bloodstream more readily than the full length version. An increase in the short GLUT9 protein raises the levels of urate in the blood and reduces its release into the urine. As a result, urate can accumulate in the body's joints in the form of crystals, leading to painful arthritis.

While changes in the SLC2A9 gene can alter urate levels in the body, they are likely not enough to cause gout by themselves. A combination of dietary, genetic, and other environmental factors play a part in determining the risk of developing this complex disorder.


  • glucose transporter type 9
  • GLUT-9
  • GLUT9
  • human glucose transporter-like protein-9
  • solute carrier family 2 (facilitated glucose transporter), member 9
  • solute carrier family 2, facilitated glucose transporter member 9
  • UAQTL2
  • urate voltage-driven efflux transporter 1
  • URATv1

  • Source: MedlinePlus, National Library of Medicine

    It is important to note that dying cells contribute to the largest portion of uric acid, some 70%, in fact. This area of concern not only pertains to the fact that these dying cells cause excess uric acid, it also speaks to the danger of what else massive cellular die-off means to your health as a whole. While genetics can play a role, your diet and lifestyle directly affect the health of your cells. This is likely the more important area to focus on. Genetic recognition and knowledge won't do you any justice in resolving your gout attacks, but the health of your cells will!

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