25/03/2025
Here are my last two kittens of 2024, both from the stunning Silverstorm Troopers first litter with Silver Sprite. Two beautiful silver girls now happy in their new home in Northern Ireland.
They have exceeded my expectations with crystal clear , completely untarnished coats, and heavily glittered. Not to mention wild type and heads.
One of these girls is extra special (first 7 photos). When she was born I thought she was a smoke (silver Melanistic) as she was so dark, but slowly as weeks passed parts of her body started to lighten until her pattern was revealed .
And what a surprise! One side of her body has big black rosettes and markings merging a little with each other. The other side looks as if silver paint has been spilt over her shoulder and runs the other side of her body so just dots of the black underneath show through.
In discussion with other breeders we decided her highly unusual pattern and colouring may be the result of ‘ Pseudo-melanism’.
Pseudomelanism, is a pigmentation variant where the normal tabby markings (spots, stripes) are unusually dense and merge, resulting in a cat that appears melanistic (solid black).
Pseudomelanism is thought to be a result of intensified tabby markings, not a lack of colour, however the gene that causes it has not yet been identified in domestic cats.
Cats with pseudomelanism can appear almost entirely black, with the exception of potentially some lighter underparts or markings.
She was darker as a kitten but not now so maybe this highly unusual kitten could be the result of Mosaicism?
Mosaicism is it’s caused by a chromosomal mutation in one cell during the embryo’s very early development. The mutation is replicated as that cell divides, and then replicated in the divided cells, and so on, so that when the organism has finished developing into a baby, part of its body contains the mutation while the rest doesn’t. The part of the body with the mutation has a different genetic profile from the rest of the body.
Another suggestion is that she could be a rare Chimera.
With a Chimera you start with two egg cells that should develop into fraternal twins—but for some reason, in those very first hours when each egg cell has only divided a few times, the egg cells fuse together. The cells continue to divide and develop into not two babies, but one that contains the genetic markers for both twins.
Since the resulting single baby has genes for both twins, sometimes it will show physical traits of both , hence her very different sides!