The U.S. Department of Agriculture (USDA) has said it doesn't need to regulate the cultivation and sale of a genetically modified mushroom because the organism in question doesn't contain any foreign DNA.
The decision is the first of its kind regarding an organism modified using CRISPR — a relatively new gene-editing technique that's better known for its applications modifying human embryos than vegetables. Unlike older methods used to create GMOs, CRISPR doesn't insert DNA from viruses and bacteria into target organisms to create its intended affects, and for this reason, the gene-edited mushroom doesn't fall under the USDA's regulatory framework.
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