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

PC gene

The PC gene provides instructions for making the enzyme pyruvate carboxylase, which is vital for energy production and the regulation of blood sugar.

Normal Function

The PC gene provides instructions for making an enzyme called pyruvate carboxylase, which is active in the mitochondria of cells. This enzyme converts pyruvate to oxaloacetate, a reaction essential for several cellular functions:

  • Gluconeogenesis: In the kidneys and liver, this process generates glucose, the body's main energy source.
  • Insulin regulation: In the pancreas, it helps regulate the secretion of insulin, which controls blood glucose levels.
  • Lipogenesis: In fat-storing (adipose) tissue, it is involved in the formation of certain fats.
  • Nervous system support: It replenishes building blocks for neurotransmitters and is necessary for the formation of myelin, the protective covering of nerve cells.

Health Conditions Related to Genetic Changes

Pyruvate carboxylase deficiency

More than 30 mutations in the PC gene have been identified in people with pyruvate carboxylase deficiency. This condition leads to the accumulation of lactic acid and other toxic compounds in the blood, which can damage organs and tissues, particularly the nervous system.

The condition occurs because:

  • Mutations reduce the amount of the enzyme or disrupt its ability to convert pyruvate to oxaloacetate.
  • The body's ability to generate glucose is impaired.
  • The loss of enzyme function in the nervous system disrupts myelin formation and neurotransmitter production, contributing to neurologic symptoms.

Frequently Asked Questions

Management focuses on minimizing lactic acid buildup and providing alternative energy sources. This typically involves a specialized diet that is high in fats and low in carbohydrates and protein, often supplemented with specific nutrients like biotin, thiamine, and carnitine. Medications may include bicarbonate to manage acidosis and sometimes citrate to help with energy metabolism. Frequent small feedings are crucial to prevent fasting, which can trigger metabolic crises.
The long-term outcomes vary depending on the severity and type of the deficiency, but many individuals experience significant neurological complications, including developmental delays, intellectual disability, seizures, and movement disorders. Other potential complications include liver dysfunction, kidney problems, and growth impairment. Early diagnosis and strict metabolic management are crucial to improve outcomes, though the condition remains challenging to manage.
Early warning signs in infants can include poor feeding, vomiting, lethargy, weak muscle tone (hypotonia), and seizures. As the condition progresses, there may be developmental delays and neurological problems. Parents should seek emergency medical care immediately if an infant shows any of these symptoms, especially if accompanied by rapid breathing or unusual drowsiness, as these can indicate a metabolic crisis with dangerous lactic acid buildup.
Pyruvate carboxylase deficiency is often suspected based on clinical symptoms and abnormal metabolic findings, such as elevated lactic acid and ammonia levels in the blood. Diagnosis is confirmed through specific enzyme activity tests on cells (like fibroblasts from a skin biopsy) or, more commonly, by genetic testing of the PC gene to identify causative mutations. Newborn screening programs in some regions may also detect markers suggestive of the condition, prompting further diagnostic tests.
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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