ELI5: What diseases could CRISPR help cure?

CRISPR could help cure diseases where something is broken in our body's instructions, like a typo in a cookbook.

Imagine your body is like a house, and your DNA is like the instruction manual for building and maintaining that house. Sometimes, there's a typo in the manual. This typo can cause parts of the house to be built wrong, or not work properly. These "typos" are genetic mutations, and they can cause diseases.

CRISPR is like a tiny pair of molecular scissors that can find these typos in the instruction manual (DNA) and cut them out. Then, sometimes, the body can repair the DNA correctly, or scientists can even insert the correct instructions.

Here are some examples of diseases CRISPR could potentially help cure:

• Sickle cell anemia: Imagine a blood cell is supposed to be round like a donut. In sickle cell anemia, there's a typo in the instruction manual, so the blood cell becomes shaped like a crescent moon, which can cause problems. CRISPR could fix that typo.
• Cystic fibrosis: This disease causes thick mucus to build up in the lungs and other organs. It's like having sticky glue instead of normal lubricants in your body. CRISPR could potentially correct the genetic defect that causes this problem.
• Huntington's disease: This is a brain disorder that affects movement, thinking, and mood. It's like a part of your brain is slowly shutting down because of a typo in the instruction manual. CRISPR could target and correct that typo.
• Some cancers: Cancer happens when cells grow out of control. Sometimes, this is caused by typos in the instruction manual that tell the cells to keep growing even when they shouldn't. CRISPR could potentially fix these typos and stop the cancer from growing.