Science
A Crispr Calf Is Born. It’s Definitely a Boy – WIRED
UC Davis scientists spent years editing a sex-determining gene into bovine embryos. In April, Cosmo arrived—and his DNA reveals how far the field has to go.
They went back and redesigned their Crispr system, using the updated map to steer their edits clear of any essential genes. Then they tried it with embryos again. This time, it worked. But by now it was the summer of 2018; nearly three years had passed. The project was way behind schedule. They had to ask the USDA for an extension on their grant. The long series of setbacks had Owen feeling pretty despondent, wishing hed never tried his hand at Crispring cattle. His recent success with editing t…
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