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Living with Myofibrillar myopathy 5

A rare inherited muscle condition (muscle filaminopathy) with slowly worsening weakness near the center of the body, starting in adulthood.

Understanding Myofibrillar myopathy 5

Myofibrillar myopathy 5, or muscle filaminopathy, is a rare muscle condition with slowly worsening weakness of the muscles near the center of the body.

Weakness is usually first greater in the legs and later involves the arms. People may have trouble climbing stairs, a waddling walk, winging of the shoulder blades, and lower back pain. Weakness in breathing muscles is common, and heart rhythm and heart muscle changes have been reported in some people. GARD lists onset in adulthood.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Weakness in the upper leg muscles
  • Trouble climbing stairs
  • Changes in walking
  • Back pain
  • Breathing muscle weakness
  • Winging of the shoulder blades

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

  4. Connect with expert centers

    Muscular Dystrophy Association may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Expert lists: Muscular Dystrophy Association
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 Muscular Dystrophy Association
  • 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 FLNC gene?
Should my heart and breathing be checked regularly?
Which therapies can help with walking and stairs?

Quick facts

Symptoms usually startAdult
InheritanceAutosomal Dominant
GenesFLNC

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

GeneticNeurological

Also known as: filaminopathy; filaminopathy (type); filaminopathy, autosomal dominant; flnc myofibrillar myopathy (disease); muscle filaminopathy; myofibrillar myopathy (disease) caused by mutation in flnc

Patient organizations

Source: NIH GARD · Myofibrillar myopathy 5GARD ID 17062 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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Perspectives from people navigating life with Myofibrillar myopathy 5.

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