U.S. flag

An official website of the United States government

GTR Home > Conditions/Phenotypes > Myopathy, myosin storage, autosomal recessive

Myopathy, myosin storage, autosomal recessive

Synonyms
CONGENITAL MYOPATHY 7B, MYOSIN STORAGE, AUTOSOMAL RECESSIVE

Summary

Autosomal recessive myosin storage congenital myopathy-7B (CMYO7B) is a skeletal muscle disorder characterized by the onset of scapuloperoneal muscle weakness in early childhood or young adulthood. Affected individuals have difficulty walking, steppage gait, and scapular winging due to shoulder girdle involvement. The severity and progression of the disorder is highly variable, even within families. Most patients develop respiratory insufficiency, nocturnal hypoventilation, and restrictive lung disease; some develop hypertrophic cardiomyopathy. Additional features include myopathic facies, high-arched palate, scoliosis, and muscle wasting with thin body habitus. Serum creatine kinase may be normal or elevated. Skeletal muscle biopsy shows variable findings, including myosin storage disease, type 1 fiber predominance, centralized nuclei, and multiminicore disease (Onengut et al., 2004; Tajsharghi et al., 2007; Beecroft et al., 2019). For a discussion of genetic heterogeneity of congenital myopathy, see CMYO1A (117000). [from OMIM]

Available tests

45 tests are in the database for this condition.

Check Related conditions for additional relevant tests.

Clinical tests (45 available)

Molecular Genetics Tests

Genes See tests for all associated and related genes

  • Also known as: CMD1S, CMH1, CMYO7A, CMYO7B, CMYP7A, CMYP7B, MPD1, MYHCB, SPMD, SPMM, MYH7
    Summary: myosin heavy chain 7

Clinical features

Help
Imported from Human Phenotype Ontology (HPO)

Show allHide all

IMPORTANT NOTE: NIH does not independently verify information submitted to the GTR; it relies on submitters to provide information that is accurate and not misleading. NIH makes no endorsements of tests or laboratories listed in the GTR. GTR is not a substitute for medical advice. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.