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GTR Home > Conditions/Phenotypes > Congenital myopathy 22A, classic

Congenital myopathy 22A, classic

Summary

Classic congenital myopathy-22A (CMYO22A) is an autosomal recessive muscle disorder characterized by onset of muscle weakness in utero or soon after birth. Early features may include fetal hypokinesia, breech presentation, and polyhydramnios. Affected individuals are born with severe hypotonia and require respiratory and feeding assistance. Those who survive the neonatal period show a 'classic' phenotype of congenital myopathy with delayed motor development, difficulty walking, proximal muscle weakness of the upper and lower limbs, facial and neck muscle weakness, easy fatigability, and mild limb contractures or foot deformities. Some have persistent respiratory insufficiency; dysmorphic facial features may be present (Zaharieva et al., 2016). For a discussion of genetic heterogeneity of congenital myopathy, see CMYO1A (117000). [from OMIM]

Genes See tests for all associated and related genes

  • Also known as: CMS16, CMYO22A, CMYP22A, HOKPP2, HYKPP, HYPP, NAC1A, Na(V)1.4, Nav1.4, SkM1, SCN4A
    Summary: sodium voltage-gated channel alpha subunit 4

Clinical features

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Imported from Human Phenotype Ontology (HPO)

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