Each column keeps its native condition scope. Initial features are displayed alphabetically, not ranked by clinical importance. Counts remain separate, and an empty cell does not mean a feature cannot occur.
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Affected individuals experience muscle cramping and stiffening after exercise or other strenuous activity, especially in cold temperatures. These symptoms typically begin in childhood. They are usually painless, but in some cases can cause mild discomfort. The muscles usually relax after a few minutes of rest. Most commonly affected are the muscles of the arms, legs, and face (particularly the eyelids).","mondoId":"MONDO:0010977","records":[{"frequencyKind":"count","key":"1bcba4a378b5797ea8b32453e3a8935beae36ec74aab1e8c5ab14858dce891ef","raw":{"aspect":"P","body_system":"nervous_system","disease_id":"OMIM:601003","disease_name":"Brody myopathy","evidence":"PCS","frequency_raw":"0/5","hpo_id":"HP:0003474","is_excluded":true,"label":"Somatic sensory dysfunction","onset_id":null,"reference":"PMID:8841193","source_release":"2026-06-23"},"sourceGroups":["published"]},{"frequencyKind":"count","key":"24339fe6c52c0cb59ee6fff88ce87b79e05a125350295dbeef93c8ce60d5d4e5","raw":{"aspect":"P","body_system":"nervous_system","disease_id":"OMIM:601003","disease_name":"Brody myopathy","evidence":"PCS","frequency_raw":"0/5","hpo_id":"HP:0031826","is_excluded":true,"label":"Abnormal 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myopathy","evidence":"PCS","frequency_raw":"0/5","hpo_id":"HP:0002411","is_excluded":true,"label":"Myokymia","onset_id":null,"reference":"PMID:10914677","source_release":"2026-06-23"},"sourceGroups":["published"]}],"referenceLabels":{},"references":{"causeHtml":"","identityNote":"MONDO cross-references identify native condition entries. Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"Mutations in the ATP2A1 gene cause Brody myopathy. The ATP2A1 gene provides instructions for making an enzyme called sarco(endo)plasmic reticulum calcium-ATPase 1 (SERCA1). The SERCA1 enzyme is found in skeletal muscle cells, specifically in the membrane of a structure called the sarcoplasmic reticulum. This structure plays a major role in muscle contraction and relaxation by storing and releasing positively charged calcium atoms (calcium ions). When calcium ions are transported out of the sarcoplasmic reticulum, muscles contract; when calcium ions are transported into the sarcoplasmic reticulum, muscles relax. The SERCA1 enzyme transports calcium ions from the cell into the sarcoplasmic reticulum, triggering muscle relaxation.
ATP2A1 gene mutations lead to the production of a SERCA1 enzyme with decreased or no function. As a result, calcium ions are slow to enter the sarcoplasmic reticulum and muscle relaxation is delayed. After exercise or strenuous activity, during which the muscles rapidly contract and relax, people with Brody myopathy develop muscle cramps because their muscles cannot fully relax.
","key":"forms","title":"What causes Brody myopathy?"},{"bodyHtml":"In some people with Brody myopathy, exercise leads to the breakdown of muscle tissue (rhabdomyolysis). The destruction of muscle tissue releases a protein called myoglobin, which is processed by the kidneys and released in the urine (myoglobinuria). Myoglobin causes the urine to be red or brown.
Source: MedlinePlus Genetics
","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"brody-myopathy","sourceDocuments":[{"name":"Brody myopathy","reviewed":"2012-01","sections":{"causes":{"fetchedAt":"2026-10-20T20:19:58.209992+00:00","label":"Causes","pageSha256":"e7eee48f23f81292eb5cdcd90871ab5e95133a0077bbd50cf440f6e74f8c3f8e","sourceUrl":"https://medlineplus.gov/genetics/condition/brody-myopathy/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/brody-myopathy"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. Feature values below retain their original sources and patient groups.","title":"Brody myopathy"},"schemaVersion":1}