Gene-edited beagles Bailey and Alfie produced

Kindred Companion Sciences said on August 5 that it had produced two beagles, Bailey and Alfie, with a gene edit designed to remove Can f 1, a major dog allergen. The New York-based company said the dogs were born in September 2024 and were created using CRISPR-Cas9 editing followed by somatic cell nuclear transfer. A peer-reviewed paper indexed by PubMed reported that saliva and hair-dander testing found no detectable Can f 1 in the edited dogs. Matt Walker, the company’s chief executive, told multiple outlets he has dog allergies and has lived with Bailey without his usual symptoms. ### What exactly was changed in Bailey and Alfie? The CRISPR Journal paper, listed on PubMed as “Targeted Genetic Knockout of Can f 1, the Major Allergen in Dogs,” said researchers introduced a frameshift mutation in exon 1 of the Can f 1 gene. The study said that edit was intended to stop production of the protein, which is found in dog saliva and hair-dander and is a common trigger for allergic reactions. (investor.wedbush.com) Kindred Companion Sciences said the two edited animals are female beagles named Alfie and Bailey. Business Wire’s version of the company announcement said whole-genome sequencing found no detectable off-target edits across the sites analyzed, and veterinary exams showed normal growth and development. (pubmed.ncbi.nlm.nih.gov) ### Why did researchers target Can f 1? PubMed records from earlier allergy research describe Can f 1 as a major dog allergen, and a classic study found it accounted for about half of IgE binding capacity in dog hair and dander extracts. More recent breed-comparison research indexed on PubMed also found that so-called hypoallergenic breeds did not show lower Can f 1 levels in hair and coat samples than comparison breeds. (investor.wedbush.com) FOX 5 New York said the work was presented as a different approach from marketing dogs as hypoallergenic because they shed less. The station reported that Bailey and Alfie were described as lacking a primary allergy-causing protein rather than simply producing less hair. ### How were the dogs produced? The study abstract on PubMed said researchers edited dog skin cells with CRISPR-Cas9 and then used somatic cell nuclear transfer to produce the puppies. (pubmed.ncbi.nlm.nih.gov) New Scientist reported that the team first modified skin cells from a female beagle, screened for the desired change, and then cloned those cells before transferring embryos to a surrogate. (fox5ny.com) Associated Press coverage, carried by ABC News and NBC News, said Walker’s company created Bailey and Alfie using CRISPR and that the dogs were born in September 2024. AP also reported that Walker said the result left him feeling “a mix of relief and awe and gratitude that it worked.” ### Does this mean the dogs are allergy-free for everyone? (pubmed.ncbi.nlm.nih.gov) The paper’s abstract said skin-prick testing in one sensitized individual showed a reaction to control dog extracts but no detectable response to extracts from the edited dogs. That is an early signal, not a broad clinical result, because the published test described one sensitized person rather than a larger trial. (abcnews.com) NBC News and AP both reported that outside experts said years of follow-up would be needed before people could expect commercial availability. Arthur Caplan, a bioethicist at New York University’s Grossman School of Medicine, told AP the work could expand pet ownership for allergic people, while also raising questions about adoption of shelter animals. (pubmed.ncbi.nlm.nih.gov) ### What happens next? Kindred Companion Sciences said it hopes to test the approach in additional dogs and service animals and eventually breed allergy-reduced lines beyond beagles. The company announcement said the publication in The CRISPR Journal was meant to document the initial proof of concept, while AP and NBC reported that long-term health monitoring and broader testing in people with dog allergies would still be needed. (ksnt.com) (investor.wedbush.com)