U.S. flag

An official website of the United States government

GTR Home > Conditions/Phenotypes > Congenital myopathy 4B, autosomal recessive

Congenital myopathy 4B, autosomal recessive

Synonyms
Nemaline myopathy 1, autosomal dominant or recessive; Nemaline myopathy caused by mutation in the tropomyosin 3 gene

Summary

Congenital myopathy-4B (CMYO4B) is an autosomal recessive disorder of the skeletal muscle characterized by the onset of muscle weakness in infancy or early childhood. The severity and pattern of muscle weakness varies, but most affected individuals show congenital contractures, delayed motor development, hypotonia, generalized muscle weakness, and weakness of the proximal limb muscles and neck muscles, resulting in difficulty walking or inability to walk. Affected individuals have respiratory insufficiency due to muscle weakness, which may be life-threatening. Other common features include myopathic facies, chest deformities, distal joint laxity, and scoliosis. Variable histologic findings on skeletal muscle biopsy are observed, including nemaline rods, type 1 fiber predomination, and centralized nuclei (Tan et al., 1999; Lehtokari et al., 2008). For a discussion of genetic heterogeneity of congenital myopathy, see CMYO1A (117000). [from OMIM]

Available tests

39 tests are in the database for this condition.

Check Related conditions for additional relevant tests.

Clinical tests (38 available)

Molecular Genetics Tests

Research tests

Genes See tests for all associated and related genes

  • Also known as: CAPM1, CFTD, CMYO4A, CMYO4B, CMYP4A, CMYP4B, HEL-189, HEL-S-82p, NEM1, OK/SW-cl.5, TM-5, TM3, TM30, TM30nm, TM5, TPM3nu, TPMsk3, TRK, hscp30, TPM3
    Summary: tropomyosin 3

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.