What is Central Core Disease

Central Core Disease is a rare, inherited neuromuscular disorder primarily characterized by muscle weakness and a predisposition to a life-threatening reaction to certain anesthesia drugs. It is caused by mutations in the RYR1 gene, which affects how muscles contract and store calcium, leading to the distinct "central core" appearance of muscle fibers under a microscope.

What causes Central Core Disease?

Central Core Disease is primarily caused by mutations in the RYR1 gene, which provides instructions for making the ryanodine receptor protein. This protein is essential for the release of calcium within muscle cells, a process required for muscle contraction. When the receptor is dysfunctional in Central Core Disease, it can lead to muscle weakness and an increased risk of malignant hyperthermia—a severe, rapid reaction to specific volatile anesthetic gases and muscle relaxants.

What are the symptoms and body systems affected?

The primary impact of Central Core Disease is on the skeletal muscles. Symptoms often present in infancy or early childhood and include:

• Generalized muscle weakness, particularly in the hips and thighs (proximal muscle weakness).


• Delayed motor milestones, such as late walking.


• Skeletal abnormalities, including scoliosis (curvature of the spine) and hip dislocation.


• Foot deformities, such as high arches or clubfoot.


• Potential for malignant hyperthermia during surgical procedures.

How common is Central Core Disease?

While the exact prevalence is unknown, Central Core Disease is considered the most common form of congenital myopathy. It affects males and females equally, and there is no known geographic, ethnic, or racial predilection. On the DiseaseMaps platform, 89 people with Central Core Disease have connected to share their experiences and support one another.

How does this differ from other myopathies?

Unlike other muscle disorders, the hallmark of Central Core Disease is the diagnostic finding on a muscle biopsy: localized areas in the center of muscle fibers that lack normal enzyme activity, known as "cores." While the clinical presentation is often stable or slowly progressive, the critical differentiator remains the specific genetic mutation and the associated risk of malignant hyperthermia.

Next steps

• Consult with a neuromuscular specialist or neurologist to confirm the diagnosis through genetic testing.


• Always inform your anesthesiologist of a Central Core Disease diagnosis prior to any surgery to prevent malignant hyperthermia.


• Join the community at DiseaseMaps.org to connect with the 89 other members living with this condition.


• Work with a physical therapist to maintain muscle strength and mobility.

Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.

References

• Orphanet: Central core disease (ORPHA:205)


• NIH Genetic and Rare Diseases Information Center (GARD)


• OMIM: Central Core Disease of Muscle (#117000)


• Malignant Hyperthermia Association of the United States (MHAUS)