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

SGCD gene

The SGCD gene encodes the delta-sarcoglycan protein, which is essential for stabilizing muscle cell membranes and protecting muscle fibers from injury.

Normal Function

The SGCD gene provides instructions for making the delta component (subunit) of the sarcoglycan protein complex. This complex is located in the membrane surrounding muscle cells and helps maintain the structure of muscle tissue by stabilizing the dystrophin complex.

The dystrophin complex, composed of dystrophins and dystroglycans, serves as an anchor connecting the muscle cell's internal framework (cytoskeleton) to the external environment (extracellular matrix). This structure strengthens muscle fibers and protects them from damage as muscles contract and relax.

Health Conditions Related to Genetic Changes

Limb-girdle muscular dystrophy

Mutations in the SGCD gene are associated with limb-girdle muscular dystrophy.

Other disorders

Some individuals who develop dilated cardiomyopathy without skeletal muscle involvement have been found to carry a mutation in one copy of the SGCD gene (an autosomal dominant inheritance pattern). However, because other individuals with similar mutations maintain normal heart muscle, some researchers continue to investigate the relationship between SGCD mutations and this specific form of cardiomyopathy.

Genomic Location

The SGCD gene is found on chromosome 5.

Frequently Asked Questions

Most SGCD‑related cardiomyopathy follows an autosomal‑dominant pattern, but penetrance is incomplete. Studies suggest that heterozygous carriers have a roughly 20‑40 % lifetime risk of developing cardiac involvement, though many remain asymptomatic. Genetic counseling can provide a personalized risk estimate based on family history and any known modifier genes.
There is no cure, but several strategies can help. For muscle health, regular low‑impact aerobic exercise, physiotherapy, and avoidance of prolonged immobilization are advised. Cardiac‑specific therapy includes early use of ACE inhibitors or angiotensin‑receptor blockers when ventricular dysfunction is detected, and beta‑blockers if indicated. Maintaining a heart‑healthy diet, controlling blood pressure, and avoiding excessive alcohol also reduce stress on the heart.
definitive answer requires molecular genetic testing. A clinician can order a targeted SGCD gene analysis (sequencing and deletion/duplication testing) from a blood sample. The test is usually ordered by a neurologist or medical geneticist after a muscle biopsy shows a dystrophic pattern or when clinical features suggest a sarcoglycanopathy.
Because SGCD mutations can lead to dilated cardiomyopathy, regular cardiac surveillance is recommended. This typically includes a baseline electrocardiogram (ECG) and transthoracic echocardiogram, followed by repeat imaging every 12 months (or sooner if abnormalities appear). Some centers also add cardiac MRI or Holter monitoring to detect early fibrosis or arrhythmias.
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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