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Living with Myopathy due to calsequestrin and SERCA1 protein overload

A rare inherited muscle condition with mild muscle weakness, or high muscle enzyme levels without symptoms, in adults.

Understanding Myopathy due to calsequestrin and SERCA1 protein overload

Myopathy due to calsequestrin and SERCA1 protein overload is a rare inherited muscle condition with mild symptoms.

People have mild muscle disease, or high levels of the muscle enzyme creatine kinase in the blood without any symptoms. GARD lists onset in adulthood.

Signs & symptoms

GARD lists muscle disease (myopathy) as the main feature.

  • Muscle disease (myopathy)
  • High creatine kinase in the blood, sometimes without symptoms

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in CASQ1 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Should we have genetic testing for the CASQ1 gene?
Should the high creatine kinase level be monitored?
Are there activities I should adjust to protect my muscles?

Quick facts

Symptoms usually startAdult
InheritanceAutosomal Dominant
GenesCASQ1

GARD lists changes in the CASQ1 gene. The condition is autosomal dominant, which means one changed copy of the gene can be enough to cause it.

GeneticNeurological

Also known as: myopathy, vacuolar, with casq1 aggregates; vacuolar aggregate myopathy; vacuolar myopathy with sarcoplasmic reticulum protein aggregates

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Myopathy due to calsequestrin and SERCA1 protein overloadGARD ID 16770 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Myopathy due to calsequestrin and SERCA1 protein overload.

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  • Recruiting studies from ClinicalTrials.gov
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  • Eligibility is confirmed by the study team

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