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PGK1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

PGK1 gene

The PGK1 gene provides instructions for the phosphoglycerate kinase enzyme, which is vital for the energy-producing process of glycolysis.

Normal Function

The PGK1 gene provides instructions for making the enzyme phosphoglycerate kinase. This enzyme is found throughout the body and is involved in glycolysis, the process by which glucose is broken down to produce energy. Specifically, it converts 1,3-diphosphoglycerate to 3-phosphoglycerate, a reaction that generates adenosine triphosphate (ATP), the primary energy source for cells.

Health Conditions Related to Genetic Changes

Phosphoglycerate kinase deficiency

At least 18 mutations in the PGK1 gene have been found to cause phosphoglycerate kinase deficiency. These mutations reduce the activity of the enzyme, disrupting energy production and leading to cell damage or death. The condition manifests in different ways depending on the individual:

  • Chronic hemolytic anemia: A shortage of red blood cells, sometimes accompanied by neurological symptoms.
  • Myopathic symptoms: Characterized by muscle weakness and cramping.

Researchers speculate that different mutations may have varying effects on enzyme activity in specific cell types, which explains why the condition affects red blood cells and the brain in some individuals, and muscle cells in others.

Genomic Location

The PGK1 gene is found on the X chromosome.

Frequently Asked Questions

Management focuses on supporting red blood cell production and preventing complications. Mild anemia may require only regular monitoring. Moderate‑to‑severe cases often need periodic transfusions to maintain hemoglobin levels above 8‑9 g/dL, especially during infections or growth spurts. Folic acid supplementation (1 mg daily) helps red cell maturation. In rare refractory cases, hematopoietic stem cell transplantation has been explored, but risks must be weighed carefully.
Phosphoglycerate kinase is essential for ATP generation in all cells, but the brain relies heavily on glycolysis during development and periods of high demand. Certain PGK1 mutations reduce enzyme activity more profoundly in neuronal tissue, leading to energy deficits that manifest as developmental delay, seizures, or peripheral neuropathy. The variability reflects which tissues express the mutant enzyme most poorly; thus, some patients have isolated anemia, while others have combined neuro‑muscular involvement.
Because PGK1 is X‑linked, females can be carriers and may exhibit mild anemia or muscle symptoms due to skewed X‑inactivation. Carrier testing is advised for mothers, sisters, and potential female relatives, especially if they have unexplained anemia or exercise intolerance. Identifying carriers informs reproductive counseling; carrier females have a 50 % chance of passing the mutated allele to each child, with sons potentially affected and daughters becoming carriers. Pre‑conception counseling and options such as prenatal diagnosis or pre‑implantation genetic testing can be discussed.
Encourage low‑impact, aerobic activities (e.g., swimming, stationary cycling) with gradual intensity increases. Warm‑up and cool‑down periods are crucial to avoid sudden energy demand spikes. Ensure adequate hydration and consider a carbohydrate snack (e.g., glucose gel) 30 minutes before exercise to provide an immediate glucose source. If cramps are severe or accompanied by dark urine, stop activity and seek medical evaluation for possible rhabdomyolysis.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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