🏥 USMLE Exam Prep

A young child is diagnosed with Duchenne muscular dystrophy. This X-linked recessive disorder is caused by a mutation in the gene encoding which protein?

A Collagen
B Dystrophin
C Fibrillin-1
D Spectrin

✓ Correct Answer: Option B

Duchenne muscular dystrophy is caused by mutations in the DMD gene, which encodes dystrophin, a crucial protein for maintaining the structural integrity of muscle fibers. Its absence leads to progressive muscle degeneration.

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