Gene Testing in Sphynx Cats : Why Extensive Gene Testing Is a Responsible Choice—Even If some genes are Not Yet Linked to the Sphynx Breed.

There’s a common assumption in the breeding world that genetic testing should be limited to conditions already documented in the breed you work with. If a gene hasn’t been linked to Sphynx, why test for it?

It sounds logical. But it falls apart the moment you look at what the Sphynx gene pool actually contains.

Sphynx cats don’t have a closed or “pure” genetic background. Ancestry testing consistently shows contributions from breeds including Exotic Shorthairs, Thai cats, Orientals, Egyptian Maus, Ragdolls, Abyssinians, Norwegian Forest Cats, Burmese, Savannahs, and others. These aren’t anomalies — they’re the result of decades of outcrossing used to establish and maintain the breed.

That history has consequences. Genes don’t respect breed labels. A mutation that causes disease in one breed can appear in another if the ancestry overlaps — and in a breed with as many contributing lines as the Sphynx, that overlap is significant.

This is not theoretical. It has happened before, in other species and other breeds.

The DM gene — Degenerative Myelopathy — was initially studied in German Shepherds. Breeders of other breeds dismissed it as irrelevant to their lines. Then it was found across dozens of breeds. Those who had already tested were prepared. Those who hadn’t were caught off guard with affected dogs in their breeding programmes.

PKD — Polycystic Kidney Disease — was considered a Persian problem. Until it appeared in other breeds with Persian ancestry. Again, the breeders who had tested broadly were ahead. The ones who had tested only for “their” breed’s known conditions were not.

The pattern is always the same. A gene is dismissed as irrelevant. Years later, research catches up and proves otherwise. And the breeders who tested early — the ones who were called excessive or unnecessary — turn out to have been the responsible ones.

This is exactly why we test for over 70 genetic markers. Not because every one of them is currently linked to Sphynx. But because the Sphynx gene pool is not isolated, genetic knowledge evolves, and what isn’t a documented concern today can become one tomorrow.

If research eventually identifies a new health link to a specific gene in Sphynx, we will already know where our cats stand. We won’t need to scramble. We won’t need to guess. The data will already be there.

Testing broadly isn’t about doing more for the sake of appearances. It’s about having a complete picture of what your cats carry — the known risks and the ones that haven’t been fully mapped yet. It’s about being prepared rather than reactive.

There is no downside to knowing more about your cats’ genetics. There is no risk in having too much data. The only risk is in having too little — and discovering it too late.

Genetics is not static. It moves forward. Breeding practices should move with it.