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SLC6A8 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

SLC6A8 gene

The SLC6A8 gene provides instructions for the creatine transporter, which is vital for energy storage and usage in cells.

Normal Function

The SLC6A8 gene provides instructions for making a protein called sodium- and chloride-dependent creatine transporter 1. This protein transports the compound creatine into cells. Creatine is needed for the body to store and use energy properly.

Health Conditions Related to Genetic Changes

X-linked creatine deficiency

At least 80 mutations in the SLC6A8 gene have been identified in people with X-linked creatine deficiency, a disorder that causes intellectual disability, behavioral problems, seizures, and muscle weakness. SLC6A8 gene mutations impair the ability of the transporter protein to bring creatine into cells, resulting in a creatine shortage (deficiency). The effects of creatine deficiency are most severe in organs and tissues that require large amounts of energy, especially the brain.

Other Names for This Gene

  • creatine transporter 1
  • creatine transporter SLC6A8
  • CRT
  • CRTR
  • CT1
  • MGC87396
  • SC6A8_HUMAN
  • sodium- and chloride-dependent creatine transporter 1
  • solute carrier family 6 (neurotransmitter transporter), member 8
  • solute carrier family 6 (neurotransmitter transporter, creatine), member 8

Frequently Asked Questions

Individuals with X-linked creatine deficiency typically experience intellectual disability, which can range from mild to severe, along with significant behavioral issues such as autism spectrum disorder features, aggression, or hyperactivity. Seizures are common and may be difficult to control. While some patients may develop speech, it is often limited. Muscle weakness is present but usually less severe than the neurological symptoms. Early intervention with behavioral therapy and seizure management is crucial to improving quality of life and functional independence.
Diagnosis of X-linked creatine deficiency (SLC6A8-related) is often challenging because standard serum creatinine levels may appear normal or even elevated, as the body compensates for the transport defect by increasing creatine production. However, brain creatine levels are significantly low. The gold standard for diagnosis is magnetic resonance spectroscopy (MRS) of the brain, which reveals reduced creatine peaks. Genetic testing for mutations in the SLC6A8 gene provides definitive confirmation. Urine creatine levels may also be elevated due to the excess production and excretion of creatine that cannot enter cells.
Oral creatine supplementation is the primary treatment for X-linked creatine deficiency and can be highly effective in some patients. Because the transporter is defective, high doses of creatine are required to force creatine into cells via passive diffusion. Some patients show improvements in seizure frequency, behavioral stability, and even cognitive function, although responses vary widely. It is important to note that while supplementation helps manage symptoms, it does not correct the underlying genetic defect, and monitoring of kidney function is necessary due to the high doses involved.
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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