Gene-edited crops should be subject to the same stringent regulations as conventional genetically modified organisms (GMOs), Europe’s highest court ruled today.

The decision, by the Court of Justice of the European Union (ECJ) in Luxembourg, is a major setback for proponents of gene-edited crops, including scientists. They had hoped that organisms created using new, precise gene-editing technologies such as CRISPR–Cas9 would be exempted from existing European law that has limited the planting and sale of GM crops.

Instead, the ECJ ruled that crops created using these technologies are subject to a 2001 directive. The directive was developed based on older breeding techniques and imposes high hurdles for developing GM crops for food.

“It is an important judgment, and it’s a very rigid judgment,” says Kai Purnhagen, a legal scholar at Wageningen University and Research in the Netherlands who specializes in European and international law. “It means for all the new inventions such as CRISPR–Cas9 food, you would need to go through the lengthy approval process of the European Union.”

That is likely to hinder investment in crop research using these tools in the EU, says Purnhagen. “From a practical perspective, I don’t think this will be at all of interest for business. So they will move somewhere else.,” he says Purnhagen.

The ruling is “tremendously disappointing”, says Nigel Halford, a crop geneticist at Rothamstead Research in Harpenden, UK. “It’s a real hit to the head,” he says. Gene-editing techniques will still be used as a research tool inif developing crops, he adds, but he doubts that companies in Europe will have much appetite to develop them. “They are not going to invest in a technology they see not having any commercial application,” Halford says.

DNA changes

The 2001 EU directive behind today’s decision concerns the intentional release GMOs into the environment — and was aimed at organisms into which entire genes, or long stretches of DNA, had been inserted. The directive provides an exemption to organisms whose genomes were modified using mutagenesis techniques, such as irradiation, which introduces changes to an organism’s DNA but doesn’t add foreign DNA..

In 2016, the French government asked the ECJ to interpret the directive in light of new plant-breeding techniques that have since emerged.

Many plant breeders and scientists contend that gene-editing techniques such as CRISPR–Cas9 should be considered mutagenesis just like irradiation, and thus exempt from the directive, because they involve changes to DNA and not the insertion of foreign genes. But people opposed to GMOs contend that the deliberate nature of alterations made through gene-editing means they should fall under the directive — which has been used to limit widespread planting of GM crops and effectively ban their sale.

In January, an advocate-general with the court, Michal Bobek, issued a 15,000-word opinion that had both sides claiming it wasissued a 15,000-word opinion that had both sides claiming it was partly in their favour . He said that gene-edited crops do constitute GMOs, under the original directive, but also that organisms modified using technologies discovered since 2001 — such as gene editing — could be exempted, so long as the don’t contain DNA from other species or artificial DNA.

But in its ruling, the ECJ determined that only mutagenesis techniques that have “conventionally been used in a number of applications and have a long safety record are exempt from those obligations.” Organisms made using mutatagenesis techniques developed after 2001 — including gene editing — are not exempt from the directive.

“This will have a chilling effect on research, in the same way that GMO legislation has had a chilling effect for 15 years now,” says Stefan Jansson, a plant physiologist at the Umeå University in Sweden. Gene-edited crops will not vanish from European research labs, but he worries funding to develop them could dry up. “If we cannot produce things that society finds helpful, then they will be less likely to fund us.”

Jansson also has practical concerns with the ruling. He developed a ‘CRISPR’ cabbage that he has consumed, and which was growing in his home garden as he spoke to Nature. “I took a photo yesterday and I took another after the ruling. It’s still the same plant. Yesterday it wasn’t a GMO, and now it’s a GMO. I’m a bit curious what I have to do. Do I have to remove it?”

Purnhagen says the ruling leaves open a possible loophole, whereby, if gene-editing techniques can be proved as safe as mutagenesis techniques that are exempted from the law, such as irradiation, they too could win an exemption.

But he doubts that researchers and businesses developing gene-edited crops will hold out hope. “I can’t see CRISPR–Cas9 and all these new technologies will be profitable in the European Union. I can’t see this happening. I think this research will move somewhere else.”