#color restriction

[amber-tortoiseshell]

Temperature-sensitive colors

The temperature-sensitivity of certain cat colorations is a spectacular phenomenon. Different parts of the cat will show different shades, since the efficiency of pigment production now depends on the local temperature, so it works better on the extremities than on the body.

Here's a picture of the heat emmission pattern of a cat, and next to it a photo of a colorpoint kitty:

Source: this video

It really is similar, isn't it?

You can follow this effect on kittens: before they are born, they bath in the even warmth of the womb, so first they’re evenly white colored, then quickly start to gain their marks: first only on the nose, the ears and the tail, only later a full mask and darker legs.

The development of Best Angel's Fernando, a black point mitted ragdoll:

Mink and sepia cats also do this, but they are darker at every given point then their pointed equivalents.

Meowmar’s Hel, black sepia burmese:

This temperature sensitivity works on adult cats, too: if a cat loses some of its fur for some reason, and later it grows back, it’ll be noticeably darker then the surrounding area, because the naked skin means the temperature is lower there.

This cat from messybeast had a leg injury that needed surgery, so now he wears pants until the next molt.

An interesting question is whether the karpati pattern is temperature-based or not. It often called "reverse colorpoint", because the most whitish areas are suspiciusly the same as on colorpoints: limbs, face, ears. It also changes most in the first months - however the direction of the change is the same: they born light and darken with age.

The development of Pablo Grey Heart, a black karpati transylvanian cat (he's one of the lighter kittens I believe):

[sparrowminder]

So, mocha cats...we know mocha lives on the C locus with other color restriction genes, but is it temperature sensitive like Siamese-style color restriction (cs) and Burmese-style color restriction (cb)? I've noticed that they tend to have darker nose ridges but beyond that, they seem like their own beast.

I have noticed that the pattern on mocha cats, with a darker nose bridge and ears, does look an awful lot like the general pattern on point/mink/sepia kittens. So I would guess that mocha still has a bit to do with temperature sensitivity. It's just that instead of the pigment machine being some degree of nonfunctional on the body and totally functional on the extremities, mocha seems to make it partially functional on the body and...very slightly more functional at the extremities.

It is also worth noting that there are C locus mutations in other animals that don't have anything to do with temperature sensitivity, so that doesn't have to be what's going on, a pure dilution effect is possible. But I think given the patterning that may be a possible explanation!

[amber-tortoiseshell]

Great summary! A few notes, sorry if i'm too hung up on details:

As far as I know, the pigment itself doesn't change in points, it's still the same eumelanin (or phaeomelanin), just less concentrated. Seal is just the name of the color, the phenotype. There's no seal pigment.

In these recent years, we had a couple more documented colorpoint dogs! (interestingly with different mutations)

image source

i'm not sure those sheeps you mentioned are actually temperature-dependant colorpoints? They don't have any documented TYR mutations, and they are born with already dark faces and legs, not pure white like pointed cats. I think this just a phenotypically similar coloration.

(image source)

Isn't frosty point = nonextension+chinchilla? I mean chinchilla IS the same gene as himalayan, but it's not temperature-sensitive, so not strictly what the original post is about. Or do i get it mixed up?

[canisalbus]

Happy non chocolate cake day.

.

[artsyhamster]

Calypso knows how to throw a party

[amber-tortoiseshell]

If the siblings in the background are pointed, then both parents must carry the siamese allele. Pointed x full color carrying burmese (cscs×Ccb) won't give cscs kits.

Adding the burmese allele to a _cs×_cs pairing means at least one of the parents has to be mink - probably the tortie point, a seal mink with white isn't likely to be called simply 'tuxedo'.

This is a blue tortie tabby mink, it's pretty close to a pointed.

So in this case the pairing is mink × full color carrying pointed - cbcsxCcs.

Another possibility is the kittens actually having different fathers, one of them carrying the siamese, the other the burmese allele.

Hey tumblr, help me with my mom's REALLY WEIRD kitten! Mom's a dilute tortie-point, dad's a moggie tuxedo. WHAT THE HECK IS THIS COLOURATION? Other two are normal point kittens, one looking to be either a blue snowshoe or a lilac snowshoe, depending on how dark he gets, and an apricot point, respectively.

@talesfromtreatment @pangur-and-grim I know the two of you do some cat coat and genetic weirdness things, so if you see this, help a body out please?

[medicalunprofessional]

wunderbar !

[lgbtqtext]

Requested by aroace-anomaly

[linnaealyn]

[eggsistential-breakdown]

in-laws! in-laws! in-laws! in-laws! in-laws!

Big fan of when people don't get along

Used these color palettes by @ultrainfinitepit, probably could have picked ones with better contrast but ngl also picked them based on names. All are based on scenes from Reincarnation Blues and Something Borrowed, Something Blues

Specific color palettes and textless versions under the cut

[amber-tortoiseshell]

how can you tell the difference between a mink/sepia and just a really dark seal?? is it only based on eye color or are there other signs

Oh, i'm actually planning to write a proper post about this in the future, but here's a short observation:

Yes, eye color is a great clue, probably the best, but my amateur advice for adult seals: look at the neck. Even a very dark point will usually have a light, creamish-white "collar" and/or "apron".

For minks and sepias, in my experience the area is either uniform with the body (which can be pretty pale, especially for younger animals!), or only lightens up to a soft brown, not to almost white.

[furiarossa]

Danny Phantom's title cards are absolutely iconic, so we dig the idea of making one (or more) if we get fake episode ideas! This is the one for Mad Science, an hypothetical episode that would introduce and center around our Doctor Mad Plasmius.

(Little trivia, we wanted a prevalence of blues and greens to homage the old movie posters for Frankenstein, one of those stories that hold high the flag of mad science! The part that took the longest for the card was settling for only one cheesy tagline. So many possible puns...). 

[Oh, and a lot more of our Danny Phantom fanarts: Here’s our tag]

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[unspuncreature]

You’re fulfilling your destiny, Anakin.

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[my-autism-adhd-blog]

Autism & ARFID

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[sparkling12]

I'm curious, in general do we prefer Poison Ivy with Green Skin or Nah?

oh reblog for more responses please lol

[gemharvest]

The bigender flag makes for such a soft palette ughhhh.. I love it.

@ochrearia 🥺👉👈........