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Native American myopathy
Native American myopathy (NAM) is a neuromuscular disorder characterized by weakness, arthrogryposis, kyphoscoliosis, short stature, cleft palate, ptosis and susceptibility to malignant hyperthermia during anesthesia.
NAM is reported exclusively in Native American Indians (Lumbee Indian population of North Carolina). Within this population, the prevalence of NAM is estimated at approximately 1:5,000.
The NAM locus has been localized to 12q13.13-14.1.
The disease is transmitted in an autosomal recessive manner.