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SLC52A3 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

SLC52A3 gene

The SLC52A3 gene provides instructions for a riboflavin transporter protein essential for absorbing vitamin B2 during digestion.

Normal Function

The SLC52A3 gene provides instructions for making a riboflavin transporter protein called RFVT3. Because the body cannot produce riboflavin (vitamin B2) on its own, it must be obtained through diet. The RFVT3 protein is found at high levels in the small intestine, where it transports riboflavin across the cell membrane for absorption.

Inside the body's cells, riboflavin is a core component of flavin adenine dinucleotide (FAD) and flavin mononucleotide (FMN). These molecules function as coenzymes, helping enzymes carry out chemical reactions necessary for:

  • Producing energy for cells
  • Breaking down (metabolizing) carbohydrates, fats, and proteins

Health Conditions Related to Genetic Changes

Riboflavin transporter deficiency neuronopathy

Mutations in the SLC52A3 gene cause riboflavin transporter deficiency neuronopathy, a neurological condition that encompasses what were previously considered two separate disorders: Brown-Vialetto-Van Laere syndrome and Fazio-Londe disease.

These mutations lead to the production of abnormal RFVT3 proteins that either fail to reach the cell membrane or have impaired transport function. This results in a shortage of riboflavin absorption in the small intestine and a subsequent reduction in FAD and FMN levels. While the exact mechanism is unclear, this deficiency leads to nerve problems, including:

  • Hearing loss
  • Muscle weakness in the face and limbs
  • Breathing problems

Frequently Asked Questions

Treatment for riboflavin transporter deficiency neuronopathy typically involves high-dose riboflavin (vitamin B2) supplementation. While the exact mechanism is still being studied, providing large amounts of riboflavin can often bypass the impaired transporter protein, allowing some riboflavin to be absorbed and reach the cells. This can help improve or stabilize neurological symptoms, especially if started early. The specific dosage and duration of treatment should be determined by a medical professional.
Early signs of riboflavin transporter deficiency neuronopathy often involve neurological symptoms, which can include hearing loss, muscle weakness, particularly in the face and limbs, and sometimes breathing difficulties. These symptoms can vary in onset and severity. If you or a loved one experience unexplained progressive hearing loss, muscle weakness, or breathing issues, especially in childhood, it is important to seek prompt medical evaluation from a neurologist or genetic specialist.
While the condition is caused by a genetic defect in the transporter protein, not necessarily a lack of dietary intake, ensuring adequate dietary riboflavin is still important. However, simply eating more riboflavin-rich foods is usually not enough to overcome the absorption problem. High-dose riboflavin supplementation, as prescribed by a doctor, is the primary treatment. A dietitian might be involved to ensure overall nutritional health, but the focus for this specific deficiency is on the prescribed supplements rather than dietary modifications alone.
Managing riboflavin transporter deficiency neuronopathy usually requires a multidisciplinary team of specialists. This may include a neurologist to address nerve problems and muscle weakness, a geneticist for diagnosis and genetic counseling, an audiologist for hearing loss, a pulmonologist for breathing difficulties, and a dietitian to advise on nutritional intake. Regular monitoring and coordinated care are essential.
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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