Gene therapy basics · USMLE Step 1

Which of the following diseases would be most amenable to gene therapy using ex vivo modification of hematopoietic stem cells?

  1. Retinal dystrophy affecting photoreceptor cells
  2. Spinal muscular atrophy affecting motor neurons
  3. Inherited blood disorders such as β-thalassemia
  4. Osteoarthritis of the weight-bearing joints
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Correct answer: Inherited blood disorders such as β-thalassemia

Inherited blood disorders are well suited to ex vivo gene therapy: hematopoietic stem cells are removed, genetically corrected in culture, and reinfused to restore normal blood cell production.

Difficulty: Medium Question 13 of 21

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