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Clinical features in female carriers

Authoring team

Dystrophin mutations may have clinically detectable effects on female carriers. The most common feature is a proximal myopathy, which may be severe. Mild abnormalities are seen on muscle biopsy, EMG or CK measurement in over 80% of carriers.

Females may be severely affected because:

  • they have an XO genotype (Turner's syndrome)
  • Lyonisation results in asymetrical X chromosome inactivation

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