Muscle Disorders Update
MedlinePlus sent this bulletin at 06/04/2014 05:53 PM EDTNew on the MedlinePlus Muscle Disorders page:
06/03/2014 11:30 PM EDT
Source: National Library of Medicine - 
06/03/2014 11:30 PM EDT
Source: National Library of Medicine -
Rippling muscle disease
On this page:
Reviewed May 2014
What is rippling muscle disease?
Rippling muscle disease is a condition in which the muscles are unusually sensitive to movement or pressure (irritable). The muscles near the center of the body (proximal muscles) are most affected, especially the thighs. In most people with this condition, stretching the muscle causes visible ripples to spread across the muscle, lasting 5 to 20 seconds. A bump or other sudden impact on the muscle causes it to bunch up (percussion-induced muscle mounding) or exhibit repetitive tensing (percussion-induced rapid contraction). The rapid contractions can continue for up to 30 seconds and may be painful.
People with rippling muscle disease may have overgrowth (hypertrophy) of some muscles, especially in the calf. Some affected individuals have an abnormal pattern of walking (gait), such as walking on tiptoe. They may experience fatigue, cramps, or muscle stiffness, especially after exercise or in cold temperatures.
The age of onset of rippling muscle disease varies widely, but it often begins in late childhood or adolescence. Rippling muscles may also occur as a feature of other muscle disorders such as limb-girdle muscular dystrophy.
Read more about limb-girdle muscular dystrophy.
How common is rippling muscle disease?
The prevalence of rippling muscle disease is unknown.
What genes are related to rippling muscle disease?
Rippling muscle disease can be caused by mutations in the CAV3 gene. Muscle conditions caused byCAV3 gene mutations are called caveolinopathies. The CAV3 gene provides instructions for making a protein called caveolin-3, which is found in the membrane surrounding muscle cells. This protein is the main component of caveolae, which are small pouches in the muscle cell membrane. Within the caveolae, the caveolin-3 protein acts as a scaffold to organize other molecules that are important for cell signaling and maintenance of the cell structure. It may also help regulate calcium levels in muscle cells, which play a role in controlling muscle contraction and relaxation.
CAV3 gene mutations that cause rippling muscle disease result in a shortage of caveolin-3 protein in the muscle cell membrane. Researchers suggest that the reduction in caveolin-3 protein disrupts the normal control of calcium levels in muscle cells, leading to abnormal muscle contractions in response to stimulation.
In addition to rippling muscle disease, CAV3 gene mutations can cause other caveolinopathies includingCAV3-related distal myopathy, limb-girdle muscular dystrophy, isolated hyperCKemia, and a heart disorder called hypertrophic cardiomyopathy. Several CAV3 gene mutations have been found to cause different caveolinopathies in different individuals. It is unclear why a single CAV3 gene mutation may cause different patterns of signs and symptoms, even within the same family.
Some people with rippling muscle disease do not have mutations in the CAV3 gene. The cause of the disorder in these individuals is unknown.
Read more about the CAV3 gene.
Read more about isolated hyperCKemia.
How do people inherit rippling muscle disease?
Rippling muscle disease is usually inherited in an autosomal dominant pattern, but it is occasionally inherited in an autosomal recessive pattern.
Autosomal dominant inheritance means that one copy of an altered CAV3 gene in each cell is sufficient to cause the disorder. In most cases, an affected person has one parent with rippling muscle disease or another caveolinopathy. Rare cases result from new mutations in the gene and occur in people with no history of caveolinopathies in their family.
Autosomal recessive inheritance means that both copies of the CAV3 gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition. People with autosomal recessive rippling muscle disease generally have more severe signs and symptoms than do people with the autosomal dominant form.
Where can I find information about diagnosis or management of rippling muscle disease?
These resources address the diagnosis or management of rippling muscle disease and may include treatment providers.
You might also find information on the diagnosis or management of rippling muscle disease in Educational resources and Patient support.
General information about the diagnosis and management of genetic conditions is available in the Handbook. Read more about genetic testing, particularly the difference between clinical tests and research tests.
To locate a healthcare provider, see How can I find a genetics professional in my area? in the Handbook.
Where can I find additional information about rippling muscle disease?
You may find the following resources about rippling muscle disease helpful. These materials are written for the general public.
- MedlinePlus - Health information
- Educational resources - Information pages (4 links)
- Patient support - For patients and families
You may also be interested in these resources, which are designed for healthcare professionals and researchers.
- Gene
Reviews - Clinical summary - Genetic Testing Registry - Repository of genetic test information (1 link)
PubMed - Recent literature- OMIM - Genetic disorder catalog (2 links)
What other names do people use for rippling muscle disease?
- rippling muscle syndrome
- RMD
For more information about naming genetic conditions, see the Genetics Home Reference Condition Naming Guidelines and How are genetic conditions and genes named? in the Handbook.
What if I still have specific questions about rippling muscle disease?
Where can I find general information about genetic conditions?
The Handbook provides basic information about genetics in clear language.
- What does it mean if a disorder seems to run in my family?
- What are the different ways in which a genetic condition can be inherited?
- If a genetic disorder runs in my family, what are the chances that my children will have the condition?
- Why are some genetic conditions more common in particular ethnic groups?
These links provide additional genetics resources that may be useful.
What glossary definitions help with understanding rippling muscle disease?
autosomal ; autosomal dominant ; autosomal recessive ; calcium ; cardiomyopathy ; cell ; cell membrane ;contraction ; distal ; gait ; gene ; hypertrophic ; hypertrophy ; inheritance ; muscular dystrophy ; mutation ;myotonia ; prevalence ; protein ; proximal ; recessive ; syndrome
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (9 links)
The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? in the Handbook.
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