Congenital Fiber Type Disproportion
Congenital fiber type disproportion is a type of congenital myopathy. Congenital myopathy refers to a group of muscle disorders that appear at birth or in infancy. Early signs and symptoms of congenital fiber type disproportion include floppiness, limb and facial weakness, and breathing problems. It is a genetic disease caused by mutations in the ACTA1, SEPN1, RYR1 or TPM3 genes. Depending on the gene and mutation involved, congenital fiber type disproportion can be passed through families in an autosomal recessive, autosomal dominant, or X-linked manner.