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

DES gene

The DES gene provides instructions for making desmin, a protein essential for the structural integrity and function of heart and skeletal muscles.

Normal Function

The DES gene provides instructions for making a protein called desmin. Desmin is found in heart (cardiac) muscle and in the muscles used for movement (skeletal muscle). Within muscle fibers, structures called sarcomeres generate the force needed for muscles to contract. Sarcomeres are linked together by structures called Z-discs to form myofibrils, which are the basic units of muscle fibers. Desmin surrounds Z-discs and plays an important role in organizing the structure and coordinating the function of muscle fibers, providing the strength and stability needed during repeated cycles of muscle contraction and relaxation.

Health Conditions Related to Genetic Changes

Myofibrillar myopathy

Variants in the DES gene have been found to cause myofibrillar myopathy, a condition characterized by muscle weakness that worsens over time.

  • Many of the DES variants lead to the substitution of one amino acid for another in desmin.
  • The altered protein cannot properly interact with Z-discs, which disrupts the linking of sarcomeres and the structure and function of myofibrils.
  • Myofibrils that are not organized correctly break down and form clumps (aggregates) of abnormal proteins within the sarcomere, leading to myopathy.
  • People with DES gene variants are more likely to have a weakened heart muscle (cardiomyopathy) than people with myofibrillar myopathy caused by variants in other genes.

Other disorders

Variants in the DES gene can also cause a rare neuromuscular disease called Kaeser syndrome, which is characterized by myopathy that typically develops in adulthood. While weakness often involves the shoulder blade area (scapula) and the lower leg and foot (peroneal), muscle weakness in other areas of the body has also been reported. Additionally, DES gene variants are associated with:

  • Arrhythmogenic right ventricular cardiomyopathy
  • Nonsyndromic dilated cardiomyopathy
  • Familial restrictive cardiomyopathy

Other Names for This Gene

  • intermediate filament protein

Frequently Asked Questions

Look for progressive muscle weakness that often starts in the shoulder blades or lower legs, unexplained heart muscle disease (dilated or restrictive cardiomyopathy), and a family history of similar muscle or cardiac problems.
Yes. DES mutations are typically inherited in an autosomal‑dominant pattern, so first‑degree relatives have a 50 % chance of carrying the same variant. Offer targeted testing for the known family mutation, and provide counseling about surveillance for muscle weakness and cardiac disease if they test positive.
Diagnosis usually begins with blood tests for creatine kinase, electromyography, and cardiac imaging. Definitive confirmation requires genetic testing (next‑generation sequencing panel for myopathy genes) and may be supported by a muscle biopsy showing desmin‑positive aggregates.
Management focuses on standard heart‑failure therapies (ACE inhibitors, beta‑blockers, diuretics) and regular cardiac monitoring (echocardiograms, MRI). In some cases, implantable cardioverter‑defibrillators are recommended to prevent arrhythmias. Physical therapy and low‑impact exercise help preserve skeletal‑muscle function, but activities that overly stress the heart should be avoided.
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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