Table 1.

Clinical phenotypes resulting from mutations in the dystrophin gene

• Duchenne muscular dystrophy

• Becker muscular dystrophy

• X-linked dilated cardiomyopathya,b

• Retinal neurotransmission defectb

• Mental retardationb

• Psychiatric disturbancesb

^aCan manifest without any musculoskeletal manifestation.

^bUsually present with Duchenne or Becker muscular dystrophy or both.