New techniques for genetic engineering are not as precise as claimed

Cattle are being genetically engineered using gene-editing tools to not grow horns. But according to newly published research by experts at the US Food and Drug Administration (FDA), gene-editing errors in the genome of these cattle are often being overlooked (see abstract below).

The animals were genetically engineered by the biotech company Recombinetics. The company also filed a patent on the genetically engineered cattle. The cattle have for some years been hyped as a positive application of new genetic engineering techniques and a boon for animal welfare, since these GM cattle will not need to be de-horned. However, it appears to have so far gone unnoticed that the gene-editing has resulted in major unintended outcomes.

Unintended effects

The gene editing scissors (nucleases) used in this case are known as TALENs, a method frequently described as highly precise, and indeed, no off-target genetic changes were detected by the developers of these hornless cattle at Recombinetics.