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FUCA1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

FUCA1 gene

The FUCA1 gene provides instructions for an enzyme that breaks down complex sugar molecules within cellular recycling centers.

Normal Function

The FUCA1 gene provides instructions for making an enzyme called alpha-L-fucosidase. This enzyme is found in lysosomes, which are compartments in the cell that digest and recycle different types of molecules.

Within lysosomes, this enzyme plays a role in the breakdown of sugar molecules (oligosaccharides) that are attached to certain fats (glycolipids) and proteins (glycoproteins). Alpha-L-fucosidase is responsible for cutting off (cleaving) a sugar molecule called fucose toward the end of the breakdown process.

Health Conditions Related to Genetic Changes

Fucosidosis

Many variants in the FUCA1 gene cause fucosidosis, a condition that can lead to severe health problems and early death. Most of these variants either shorten the alpha-L-fucosidase enzyme or change a single amino acid, preventing the enzyme from functioning properly.

  • Accumulation: Because the enzyme cannot break down glycolipids and glycoproteins, these compounds accumulate in the lysosomes, causing cells throughout the body to malfunction.
  • Neurological impact: Brain cells are particularly sensitive to this buildup, which is thought to cause the neurological symptoms of the disease.
  • Systemic impact: Accumulation also occurs in organs such as the liver, spleen, and skin, contributing to the clinical symptoms of the condition.

Other Names for This Gene

  • a-L-fucosidase 1
  • alpha-L-fucosidase 1
  • FUCA
  • fucosidase, alpha-L, tissue
  • fucosidase, alpha-L-1, tissue
  • tissue fucosidase
  • α-L-fucosidase 1

Frequently Asked Questions

Diagnosis of fucosidosis usually involves a combination of clinical evaluation, biochemical tests to measure alpha-L-fucosidase enzyme activity in blood or skin cells, and genetic testing to identify specific mutations in the FUCA1 gene. Elevated levels of fucose-containing oligosaccharides in urine can also be an indicator.
Currently, there is no cure for fucosidosis. Treatment focuses on managing symptoms and providing supportive care to improve quality of life. This can include therapies for neurological symptoms, nutritional support, and management of organ-specific issues. Research into enzyme replacement therapy or gene therapy is ongoing but not yet standard clinical practice.
Fucosidosis is a severe progressive disorder. The prognosis varies depending on the specific mutation and severity of the disease, but it often leads to significant neurological deterioration, severe health problems, and a shortened lifespan, with many affected individuals not surviving past childhood or early adulthood.
Fucosidosis symptoms can vary but often include developmental delays, neurological problems like seizures or difficulty with movement, coarse facial features, skin lesions (angiokeratoma), and enlargement of the liver and spleen. These symptoms typically become noticeable in infancy or early childhood, progressing over time.
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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