The Code Breaker

by Walter Isaacson

But in 2012 Doudna and others figured out a more earth-shattering use: how to turn CRISPR into a tool to edit genes. CRISPR is now being used to treat sickle-cell anemia, cancers, and blindness. And in 2020, Doudna and her teams began exploring how CRISPR could detect and destroy the coronavirus. “CRISPR evolved in bacteria because of their long-running war against viruses,” Doudna says. “We humans don’t have time to wait for our own cells to evolve natural resistance to this virus, so we have to use our ingenuity to do that. Isn’t it fitting that one of the tools is this ancient bacterial immune system called CRISPR? Nature is beautiful that way.”