Why Creating ‘Hypoallergenic Cats’ With Gene Editing Is A Bad Idea

On paper, the promise of “hypoallergenic cats” sounds great.

For the first time, people who love cats but are allergic to the furry little guys would be able to open up their homes to them. More cat lovers and more homes for cats is always a good thing, right?

Maybe not in this case.

The quest to create cats who do not trigger allergies depends on CRISPR gene editing, a method that allows scientists to edit, delete and replace sections of the genome. In this case, Virginia-based biotech company InBio wants to edit the genome of domestic felines to block Fel d 1 (Felis domesticus allergen I), a protein produced in cat saliva and in tiny subdermal exocrine glands, which secrete the protein via the same ducts that allow a cat’s fur to grow out from its skin.

Since cats are fastidious neat freaks and groom themselves constantly, the Fel d 1-carrying saliva is applied to their coats several times a day. When it dries, it contaminates a cat’s living space by flaking off the fur as dander or by shedding.

That’s why people who are allergic to cats can suffer symptoms like sneezing, itching and watery eyes not only from petting them, but also from spending time in homes where cats live.

What does Fel d 1 do, and why do cats need it?

The problem is that no one knows why cats produce Fel d 1 and what purpose it serves. Other proteins, like Fel d 4 found in pheromones and Fel d 2, help cats communicate by scent and prevent certain fluids from leaving the bloodstream, respectively.

Take a look at this quote from Nicole Brackett, a geneticist at InBio: (The emphasis on certain words is ours)

“The gene sequences don’t appear to be that well conserved over the course of evolution, which suggest things about whether or not the gene is essential,” Brackett told BioSpace, a life sciences publication. “An essential gene, one that would be required for survival or viability, generally doesn’t change much over evolution, and we’re seeing change between the exotic and domestic cat that suggests that maybe those sequences are not conserved, and maybe the protein is not essential.”

While we understand scientists have to be circumspect, especially regarding research that breaks new ground, that’s a lot of hedging and a lot of uncertainty. (It’s also not clear if Brackett is comparing domestic feline Fel d 1 levels to wild cats — felis sylvestris and lybica — wild felids in general, or hybrids like Bengals and Savannah cats, which are more commonly called exotics.)

cute cat lying on pillow
Credit: cottonbro/Pexels

The team members developing the allergen gene edit assume Fel d 1 doesn’t have a critical function because individual domestic cats and other species of felids may produce different quantities of the protein.

But that’s a huge assumption, and it’s also presumptuous to assume we humans would know whether the gene edits have a major impact on felines. After all, we still don’t always know when cats are in pain or the reasons for many of their behaviors, and we don’t know what sort of cascade effect can be triggered by shutting down the production of a protein.

The race to make cats hypoallergenic

Companies see a huge opportunity for profit in the cat allergy alleviation market. Last year, Purina announced to much fanfare the availability of a new kind of cat food the company claimed would drastically reduce allergens after about three weeks of putting kitties on the new grub.

The claims haven’t been independently verified, and most press coverage is either credulous or consists of marketing masquerading as news coverage, like this advertisement from Purina that is presented like a news story in USA Today.

Back when a company called HypoCat announced it had conducted successful trials of a “vaccine” that would “neutralize’ Fel d 1, we spoke with immunologist Kamal Tirumalai, who pointed out that humans making such profound changes to companion animals for the sake of human convenience “passes neither the scientific nor the moral smell test.”

Like others, Tirumalai said she worried about unintended consequences.

“A vaccine given to cats to reduce their allergenicity for humans burdens them unnecessarily when human allergy to cats is primarily a human problem and should have a human solution in the form of reducing people’s cat allergies,” Tirumalai told PITB at the time. “Cats are perfect as they are. Why should they be the ones forced to change in order to be accommodated by a human whose immune system happens to have a problem with one of their proteins? This solution just doesn’t pass the moral smell test.”

HypoCat uses an injection to “induce anti-Fel d 1 antibodies in the cat,” while the CRISPR technique would snip the relevant DNA out entirely.

“Come now, let us not be absurd. Do you really think a designer kitten could be as handsome as I am?” Credit: Big Buddy

So far, Brackett and her colleagues have deleted one of two cat cells that produce Fel d 1 in samples in a petri dish, and have not made any changes to live animals. The experiments yielded a “55 percent knockout rate” for the Fel d 1 allergen, Brackett said, “which we were really happy with.”

Designer kittens: Gattaca for cats

If subsequent attempts are successful and the company sees commercial promise in editing feline genes, the process could be used to create “designer kittens” or to alter the genomes of existing cats. Brackett told Smithsonian magazine that the goal is to accomplish the latter.

But if it turns out the edits don’t work for existing cats, or the designer kitten trend becomes a thing, there’s another major moral concern similar to the objections to cat cloning. If people buy designer kittens, they’re not opening their homes to the millions of cats who need them.

Manipulating feline DNA isn’t a novel idea. A decade ago, a research team spliced genes from jellyfish using a different method to create cats who glow in UV light as part of a study into feline immunodeficiency virus (FIV).

Ultimately it comes down to what we’re willing to do for the sake of our own convenience. At a time when declawing has finally been outlawed in two states and dozens of cities, and people are more conscientious than ever with regard to their pets, do we want to risk their health so we don’t have to pop a few Benadryl?

13 thoughts on “Why Creating ‘Hypoallergenic Cats’ With Gene Editing Is A Bad Idea”

    1. I do owe that to Kamala, who was kind enough to read the HypoCat study in detail and explain some of the science behind it to me. I’m comfortable reading behavioral studies, studies from the soft sciences and even stuff like astrophysics, but immunology, gene editing and such is way beyond me as a lay person.

      Gene editing scares me precisely because scientists are messing with things they don’t fully understand, and we have no idea how it will impact cats to literally delete snippets of genetic code. Even if we understood the function of Fel d 1, I wouldn’t support it.

      Liked by 1 person

      1. I looked at a UK report of this study, which mentioned in passing that only 15% of humans have this type of cat allergy. It does make more sense to fix the humans than the cats.

        Remember that physicians used to believe that human sickle cell trait should be eliminated until they learned of its sizable protective effect against malaria. (Sickle cell *disease* does cause serious blood problems.)

        Liked by 1 person

      2. The prospect of gene editing reminds me of human sickle-cell trait. Although the disease can produce serious results, once medical experts learned that the trait was protective against malaria, scientists stopped trying to eliminate it.

        Please excuse if this post is a duplicate.

        Liked by 1 person

  1. What will they think of next?? Robot Catss???
    Mee BellaSita Mum iss allergick to catss butt shee has had catss since shee was 12 yeerss old. An now shee iss old lady an has mee! Sumtimess shee takess sum Aunty Hissytamine butt mostlee not….
    Shee sayss catss are werth a bit of sneezin an wheezin! 😉
    **purrss** BellaDharma =^..^=

    Liked by 2 people

    1. A Japanese company sells robot cats. I wrote a story about it a while ago…they’re very, very weird, almost like furry pillows with tails that give a haptic, purring-like feedback when they’re petted. Although maybe there’s really a market for them there, where people live right on top of each other and it’s not always possible to have pets. That’s also why cat cafes do so well there.


      1. Other manufacturers produce robot cats that respond with several cat-like behaviors to touch. The cats are quite meaningful to people with dementia, nursing home and hospital residents, et al.

        Liked by 1 person

      2. That makes sense, since unfortunately you cannot have cats in a hospital or similar setting. It’s a shame because pets do so much to help people heal but I get why they can’t be there.


  2. I should have expected something like this, as humans in general CANNOT LEAVE WELL ENOUGH ALONE, period. Someone convinced us that we are GODS, and as such are entitled to alter ANYTHING that we choose, especially LIVING BEINGS. I am an Animal Rights Activist, and I am constantly being assaulted by EVIL HUMANS THAT CARE FOR NO ONE EXCEPT THEMSELVES. Anyone that declaws a Cat, should be after their own declawing, tossed aside to {attempt}, to survive.

    My views on Animal cruelty, neglect, abuse, and MURDER, are undoubtedly extreme, however, this issue is itself EXTREME and in my opinion should be dealt with in kind.

    I LOVE ALL OF YOU ANIMALS MORE THAN 99.9% of humans. I would literally trade my life to save you.

    Liked by 1 person

  3. I think they should tamper with human genes to change the people who are allergic to cats. They can “alter the genomes of existing [people].”
    I’m sure that they would make huge profits from this. And once they successfully snip and clip human gene sequences, they can sell the technology to the military, and we’ll be off to the race

    Liked by 1 person

    1. Maybe it’s happening in China or another country where research isn’t regulated or the authorities look the other way on sketchy projects. Wasn’t the rumored “humanzee” embryo experiment conducted in a Chinese lab?


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s