Gene therapy aims in correcting diseases caused by defective genes. A child is suffering from a disease due to deficiency of ADA enzyme. ADA gene which normally produces the enzyme is missing in the patient. Recommend any two methods to treat the child.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Condition**: The child is suffering from a deficiency of the ADA (Adenosine Deaminase) enzyme, which is crucial for the immune system. The absence of this enzyme leads to Severe Combined Immunodeficiency (SCID), making the child vulnerable to infections.

2. **Identifying Treatment Options**: There are two primary methods to treat ADA deficiency:
- **Bone Marrow Transplantation**: This method involves transplanting healthy bone marrow from a compatible donor. The new bone marrow can produce the ADA enzyme, thus correcting the deficiency.
- **Enzyme Replacement Therapy (ERT)**: In this approach, the missing ADA enzyme is administered to the patient regularly to compensate for the deficiency. This therapy helps manage the symptoms but does not provide a permanent solution.

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