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

DYSF gene

The DYSF gene provides instructions for producing the protein dysferlin, which is essential for repairing muscle fiber membranes and regulating cell signaling.

Normal Function

The DYSF gene provides instructions for making a protein called dysferlin. This protein is found in the thin membrane that surrounds muscle fibers, known as the sarcolemma. Dysferlin plays an important role in repairing the sarcolemma when it becomes damaged due to muscle strain. Researchers also suggest that dysferlin may be involved in transporting materials within muscle fibers and working with calcium to regulate cell signaling pathways.

Health Conditions Related to Genetic Changes

Limb-girdle muscular dystrophy

Variants (mutations) in the DYSF gene can cause a type of limb-girdle muscular dystrophy called LGMD R2. This condition is characterized by the following:

  • Weakness (myopathy) and wasting (atrophy) of proximal muscles.
  • Affected areas include the shoulders, hips, thighs, and upper arms.

These variants cause cells to produce a non-functional version of the protein, which interferes with muscle repair and leads to the associated myopathy and atrophy.

Miyoshi myopathy

Variants in the DYSF gene can also cause Miyoshi myopathy, a disorder characterized by myopathy and atrophy of distal muscles, particularly those in the lower legs. Many of these variants lead to the substitution of one amino acid for another in the dysferlin protein. This altered protein impairs the cell's ability to repair the sarcolemma. Researchers have recently suggested that LGMD R2 and Miyoshi myopathy are part of the same disease spectrum.

Other disorders

DYSF gene variants also cause distal myopathy with anterior tibial onset. This condition is characterized by myopathy that is most apparent in the lower legs, typically beginning in the tibialis anterior muscle, which helps flex the foot. The condition worsens over time. Because these various conditions are all caused by changes in the DYSF gene, some researchers propose they are not separate disorders but rather a single condition collectively referred to as dysferlinopathy.

Other Names for This Gene

  • FER1L1

Frequently Asked Questions

Dysferlinopathies typically present with proximal muscle weakness that progresses slowly (LGMD R2) or with distal weakness, especially in the lower legs (Miyoshi myopathy). Onset is usually in the second or third decade of life. Unlike some dystrophinopathies, dysferlinopathy often shows minimal cardiac involvement and may have normal or mildly elevated creatine kinase levels. Muscle biopsy with immunohistochemistry for dysferlin or genetic testing confirms the diagnosis.
Exercise programs should focus on low‑impact, controlled movements to avoid over‑strain. Strengthening of proximal muscles (for LGMD R2) and distal calf muscles (for Miyoshi) using resistance bands or light weights is beneficial. Flexibility exercises and aquatic therapy can improve range of motion and reduce fatigue. Regular monitoring by a physiotherapist helps adjust intensity and prevent contractures.
Sequencing of the DYSF gene (whole‑gene sequencing or targeted mutation panels) is the gold standard. Copy number variation analysis (e.g., MLPA) is also performed to detect large deletions or duplications. DYSF mutations are inherited in an autosomal recessive pattern, meaning both parents carry one mutant allele and the child inherits two. Carrier testing is recommended for family members.
Standard care includes physiotherapy, orthotic support, and management of complications. Emerging therapies involve gene replacement (e.g., AAV‑mediated dysferlin delivery) and exon skipping strategies. Clinical trials are ongoing; patients can find opportunities through registries such as the Muscular Dystrophy Association (MDA) or the National Institutes of Health (NIH) clinical trials database. Discussing trial eligibility with a specialist is 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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