Gene – Pain In The Bud

When Professor Hiroyuki Sasaki retired, he wasn’t done with science. He just wanted to use it to better understand his cats.

The Japanese geneticist raised more than $73,000 from Japanese and international cat lovers and put together a team, including partners from the US. Then he began the hard work of scrutinizing feline DNA to find out why some cats are orange, and why most all-orange cats are male while virtually all calico and tortoiseshell cats, whose coats have splotches of orange, are female.

It turns out there’s no genetic instruction telling the fur to take on an orange pigment — it’s the absence of a segment of DNA, which governs pigment production, that does it.

In other words, ginger cats are mutants.

Most fully-orange cats are male because the mutation removes the DNA segment in the X chromosome. As males have X and Y chromosomes, they only need the mutation in the single X chromosome for their coats to express in that shade.

Lots of cat lovers swear that coat color and temperament are connected.

Females have an XX chromosomal arrangement, so they need the mutation in both chromosomes to turn tangerine. If the mutation only shows up in one chromosome, you get patches of the color instead of a consistent coat.

That explains why 80 percent of ginger cats are male, and why only one in 3,000 calicos and tortoiseshells are male. A male cat would need an extra X chromosome, XXY, to be born with a calico or tortoiseshell coat. One of the side effects, however, is sterility.

Scientists estimate only one in a thousand male calicos/tortoiseshells can reproduce and pass their unique mutations on.

It’s not just coat color either. The mutation impacts skin and eye color, which is why a ginger cat might have a pink nose compared to the terracotta shade of a void cat or a silver tabby.

Are orange cats really more friendly and silly?

So how does this relate to temperament, and the many people who attest to a particular personality associated with orange cats? Some people say ginger tabbies are more loyal, affectionate and social than cats of other coat colors, but they’re also more prone to doing boneheaded things.

The stereotypes have picked up steam online, where people often share memes depicting orange felines as earnestly derpy, but they may be on to something — or at least, it can’t be ruled out until we know more.

Ginger cats are not the sharpest claw on the paw, according to popular memes.

Because of the missing piece of genetic code, a specific gene, ARHGAP36, isn’t “expressed.” Like so many genes, scientists don’t fully understand everything ARHGAP36 impacts, or how alterations can lead to unexpected changes elsewhere.

“Many cat owners swear by the idea that different coat colours and patterns are linked with different personalities,” Sasaki told the BBC. “There’s no scientific evidence for this yet, but it’s an intriguing idea and one I’d love to explore further.”

Header image via Pexels

In 1961, a shepherd named William Ross found a barn cat with a curious feature: instead of the upright, swiveling, satellite dish ears of a normal feline, this cat’s ears were floppy and shapeless, resting atop her head like a tiny knitted cap.

Ross took the cat home and named her Susie. Susie gave birth to a litter of kittens with the same floppy ears, and it all gets a bit murky from there, with a dozen variations of the story online claiming it was Ross himself or a neighbor who “created” the breed.

Regardless of who it was, the floppy ears were transformed from an abnormal feature into the unmistakable characteristic of a breed, and the Scottish Fold was born.

The cute cats quickly caught on and were officially recognized in competitions by 1971.

Now they’re more in vogue than ever. They’re the preferred pets of music superstars Taylor Swift and Ed Sheeran, who regularly feature photos and videos of their Scottish Folds in social media posts. People across the world are buying them, and they routinely appear in “best breed” lists online, lauded for being cuddly and docile in addition to adorable.

Ed Sheeran with his Scottish Fold cat. Credit: Ed Sheeran/Instagram

But they’ve also been banned by the same cat fancy groups that initially welcomed them, they’re prohibited outright in some countries, and animal welfare groups are begging people to stop emulating celebrities by buying them.

That’s because the same deformity that gives Scottish Folds their distinctive ears is also responsible for weak and brittle cartilage and bones elsewhere in the body, which results in lifelong pain and disability.

According to the RSPCA:

“The disease is evident on x-rays of cats from as young as seven weeks of age. Serious abnormalities in joints and bone growth lead to arthritis (painful, swollen joints), short, abnormally thick, and inflexible tails, spinal abnormalities and short, stiff legs. The welfare impacts of Scottish Fold Osteochondrodysplasia can be severe in terms of pain and inability to perform natural behaviours, as these cats can be lame, walk with an abnormal gait, can be reluctant to engage in normal movements such as walking or jumping, and can even become completely crippled.

There is no cure for this progressive condition.”

Sadly, the deformities and resulting pain may be the reason Scottish Folds are considered docile and cuddly: they may simply be in too much pain to move or protest when their humans hug them or pick them up.

Ross and Turner didn’t know it in 1961, but the folded ears and brittle cartilage were the result of a genetic mutation. It wasn’t until 2016 that a group of American and Australian scientists found a mutation in a single gene, TRPV4, was responsible for weak cartilage and bones, leading to the deformities highlighted by the RSPCA in the passage above, as well as “progressive joint destruction.” The condition is called osteochondrodysplasia.

Taylor Swift and Scottish Fold cat — Swift’s cats have appeared in her music videos, feature prominently in her online posts, and were photographed in her arms for her 2024 post announcing she was supporting Vice President Kamala Harris in November’s presidential election.

Cats Protection, a UK charity, raised the issue in 2024, warning that Scottish Folds were becoming even more popular, with breeders struggling to meet high demand. The group issued a public statement asking cat lovers and Swift fans to avoid buying Scottish Folds. Scottish Folds are equally popular in the US, spurring resistance from stateside animal welfare groups as well.

The Governing Council of Cat Fancy, which registers breeds in the UK — and no longer recognizes Scottish Folds — was even more direct.

“We strongly advise members of the public not to try to acquire cats of this breed,” Steve Crow, chairman of Cat Fancy’s governing board, told The Guardian.