Hairless Kitten from Siamese X Siamese

[Katnic]

HI, I recently acquired a hairless kitten from Siamese X Siamese. There are no out crosses to other hairless breeds. We live in a small community in which the Sphynx is relatively new and very rare and have no Peterbalds in our province.
I've shown his picture to breeders and they are ruling out a Sphynx lineage threw his body type and facial feature, lack of duvet on the bridge of his nose etc. He looks exactly like a bald Peterbald with Siamese points. There was 3 kittens in the litter- 2 bald and one with fur but very very lightly on the underside.
I am wondering if anybody has heard of or seen this mutation and what was the life expectancy, possible health issues......??? Should this gene be preserved if genetic testing is sound?