Most pigs in the US are confined to factory farms where they can be afflicted by a nasty respiratory virus that kills piglets. The illness is called porcine reproductive and respiratory syndrome, or PRRS.
A few years ago, a British company called Genus set out to design pigs immune to this germ using CRISPR gene editing. Not only did they succeed, but its pigs are now poised to enter the food chain following approval of the animals this week by the U.S. Food and Drug Administration.
The pigs will join a very short list of gene-modified animals that you can eat. It’s a short list because such animals are expensive to create, face regulatory barriers, and don’t always pay off. For instance, the US took about 20 years to approve a transgenic salmon with an extra gene that let it grow faster. But by early this year its creator, AquaBounty, had sold off all its fish farms and had only four employees—none of them selling fish.
Regulations have eased since then, especially around gene editing, which tinkers with an animal’s own DNA rather than adding to it from another species, as is the case with the salmon and many GMO crops.
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But there is still a way to go before gene-edited bacon appears on shelves in the US. Before it makes its sales pitch to pig farms, Genus says, it needs to also gain approval in Mexico, Canada, Japan and China which are big export markets for American pork.
Culbertson says gene-edited pork could appear in the US market sometime next year. He says the company does not think pork chops or other meat will need to carry any label identifying it as bioengineered. “We aren’t aware of any labelling requirement,” Culbertson says.
https://www.technologyreview.com/2025/05/02/1116059/the-us-approves-crispr-pigs-for-food/