Can a new CRISPR technique unlock the secrets of how cancer spreads?
Jonathan Weissman’s team watched the cancer cells spread across the doomed mouse. Engineered with a bioluminescent enzyme, they appeared in scans first as a small navy blue diamond lodged near the heart; a week later, as a triangle splayed across the mouse’s upper body, with streaks of green and two distinct bright red hubs of activity. By day 54, the mouse resembled a lava lamp.
The images would have been familiar to any cancer biologist, but they didn’t actually tell you much about what was going on: why the cancer was metastasizing or which cells were responsible. For that, Weissman’s team had designed a new tool. Inside the original navy blue diamond, they had engineered the microbiological equivalent of an airplane’s black box — a “molecular recorder” that, after the mouse’s death, could allow them to extract the cells and wind back intimate footage of a single cancer’s ascent.
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