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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"<p>GPI deficiency is caused by mutations in the GPI gene, which provides instructions for making an enzyme called glucose phosphate isomerase (GPI). This enzyme has two distinct functions based on its structure. When two GPI molecules form a complex (a homodimer), the enzyme plays a role in a critical energy-producing process known as glycolysis, also called the glycolytic pathway. During glycolysis, the simple sugar glucose is broken down to produce energy. Specifically, GPI is involved in the second step of the glycolytic pathway; in this step, a molecule called glucose-6-phosphate is converted to another molecule called fructose-6-phosphate.</p><p>When GPI remains a single molecule (a monomer) it is involved in the development and maintenance of nerve cells (neurons). In this context, it is often known as neuroleukin (NLK).</p><p>Some GPI gene mutations may result in a less stable homodimer, impairing the activity of the enzyme in the glycolytic pathway. The resulting imbalance of molecules involved in the glycolytic pathway eventually impairs the ability of red blood cells to maintain their structure, leading to hemolysis.</p><p>Other GPI gene mutations may cause the monomer to break down more easily, thereby interfering with its function in nerve cells. In addition, the shortage of monomers hinders homodimer formation, which impairs the glycolytic pathway. These mutations have been identified in individuals with GPI deficiency who have both hemolytic anemia and neurological problems.</p><p class=\"section-source\"><a href=\"https://medlineplus.gov/genetics/condition/glucose-phosphate-isomerase-deficiency/#causes\">MedlinePlus Genetics: Causes</a></p>","key":"forms","title":"What causes Glucose phosphate isomerase deficiency?"},{"bodyHtml":"<p>Hemolytic anemia in GPI deficiency can range from mild to severe. In the most severe cases, affected individuals do not survive to birth. Individuals with milder disease can survive into adulthood. People with any level of severity of the disorder can have episodes of more severe hemolysis, called hemolytic crises, which can be triggered by bacterial or viral infections.</p><p>A small percentage of individuals with GPI deficiency also have neurological problems, including intellectual disability and difficulty with coordinating movements (ataxia).</p><p class=\"section-source\">Source: <a href=\"https://medlineplus.gov/genetics/condition/glucose-phosphate-isomerase-deficiency\">MedlinePlus Genetics</a></p>","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"glucose-phosphate-isomerase-deficiency","sourceDocuments":[{"name":"Glucose phosphate isomerase deficiency","reviewed":"2013-12","sections":{"causes":{"fetchedAt":"2026-10-20T20:21:48.047287+00:00","label":"Causes","pageSha256":"1c47c88057189cdad9336a7f6df40ee53ca85f52ee8127df7a48bef96675620b","sourceUrl":"https://medlineplus.gov/genetics/condition/glucose-phosphate-isomerase-deficiency/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/glucose-phosphate-isomerase-deficiency"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. 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