Cause: mutations in dystrophin gene, x-linked inheritance, and is present at birth
Symptoms:
Symptoms:
- Frequent falls
- Difficulty getting up from a lying or sitting position
- Trouble running and jumping
- Waddling gait
- Large calf muscles
- Learning disabilities
Duchenne: age of onset (4-6 years)
- severe, progressive muscle degeneration
- loss of ability to walk by age 9-12
- death by 14-20 of respiratory failure/cardiomyopathy
Becker: age of onset (after 16)
- milder form than Duchenne; muscle pain, dilated cardiomyopathy