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anatomical human body with closeup of sickle cells

On a picturesque fall day a few years ago, I opened the mailbox and took out an envelope as thick as a Bible that would change my life. The package was from Vertex Pharmaceuticals, and it contained a consent form to participate in a clinical trial for a new gene-editing drug to treat sickle cell disease.

A week prior, my wife and I had talked on the phone with Haydar Frangoul, an oncologist and hematologist in Nashville, Tennessee, and the lead researcher of the trial. He gave us an overview of what the trial entailed and how the early participants were faring. Before we knew it, my wife and I were flying to the study site in Nashville to enroll me and begin treatment. At the time, she was pregnant with our first child.

I’d lived with sickle cell my whole life—experiencing chronic pain, organ damage, and hopelessness. To me, this opportunity meant finally taking control of my life and having the opportunity to be a present father.

The drug I received, called exa-cel, could soon become the first CRISPR-based...