What causes polydactyl Maine Coon cats?

-

We know that the Maine Coon is predisposed to polydactyly. The Maine Coon cat breed is famous for cats having more than the usual number of toes. In fact, it wasn't until very recently that the polydactyl Maine Coon was accepted by The International Cat Association (TICA). Polydactyl Maine Coons are not accepted by the Cat Fanciers' Association (CFA) as at the date of this post.

Polydactyl MC
Polydactyl MC. Image in public domain.

RELATED: Polydactylism was deliberately bred out of the Maine Coon.

A study report on SAGE Journals regarding: 'Genetic heterogeneity of polydactyly in Maine Coon cats', concluded that "polydactyly in Maine Coon cats is inherited as an autosomal dominant trait with incomplete penetrance and variable expressivity and this trait is characterised by genetic heterogeneity in the Maine Coon breed".

RELATED: Polydactyl cat record holders 2022.

It might be helpful the break that information down a bit if we can. "Polydactyly" is another word for polydactylism. "Autosomal" means not sex-linked. In other words polydactylism affects males and females. "Dominant" means a dominant version of a gene; a particular variant of a gene, which for a variety of reasons, expresses itself more strongly, by itself, than any other version of the gene. The word 'trait' means characteristic. They could have said 'autosomal dominant mutated gene'. That might have been better actually.

The phrase "incomplete penetrance" means that when some cats carry the gene they might not be polydactyl cats. It is sometimes called reduced penetrance. That is my understanding. The phrase "variable expressivity" means that polydactyly or polydactylism is very variable in the way it shows itself in terms of the number of toes polydactyl cats have and the shape of the feet. It affects the bones of the feet to different degrees.

Comments

Post a Comment

Please share your Maine Coon experiences.

Popular posts from this blog

The extreme Maine Coon face

-
Image
This is an example of extreme breeding. This is a Maine Coon but this cat is an extreme and rare example of this breed. This is not the way they look normally. This face is almost like an aggressive robot with the piercing eyes and the huge muzzle.  Or like a lion's head. The head looks enormous and very heavy. It looks unreal. But it also looks very impressive.  And purchasers like impressive-looking domestic cats. But this not the face of a Maine Coon that wins cat show competitions as it does not fit the breed standard as accurately as the more moderate winners (see below).  In fact, the CFA standard is clear in that the cat should have a balanced appearance although this cat was not bred under the CFA breed standard as I understand it (see below).  Click here for more on the kind of MC which wins at shows . Maine Coon selectively breed to have an extreme face. Image in the public domain. And the Maine Coon is meant to be a large cat, the largest domestic cat breed and there
Read more

Eerie picture of a Maine Coon sitting like a human on a chest of drawers

-
Image
This is a slightly scary picture according to those who've seen it. One social media user said it was the devil and "If I walked into a room and saw that, I would assume some shit is about to go down". There is a ghostly stillness and sinister feeling about the image. 'Eerie' is a better description. This attractive cat appears to be completely at ease and comfortable sitting on top of a chest of bedroom drawers. The lighting from below (deliberate?) enhances the eerie effect. It seems possible that this is a photo-edited image but if so, it has been done with great skill. However, I don't think this is Photoshopped. Rethink: to be honest, the more I look at the picture, the more I feel that this is a photo-edited image. It is just too unnatural to be real. Although some domestic cats get themselves into some very strange positions. Maine Coon calmly sitting just like a human on a chest of drawers. Picture source unclear. Image deemed to be in the public d
Read more

Black smoke Maine Coon Richie with a black face and diamond eyes

-
Image
Black smoke Maine Coon Richie with a black face and diamond eyes. Photo: Instagram. OMG, this is a Maine Coon with an amazing face. His full name is "Richie du Mont d’Even". I think he has a black smoke coat which has created this black face with the assistance of other genes (polygenetic influence?) and ears with piercing, diamond eyes. This is a very special cat. Richie looked very interesting but relatively plain as a kitten. Image: Instagram. His paws are balls of fluff. He has a mane that goes over his head like a halo. He's angelic and other-worldly. The lynx tips on the end of his ears are smoky grey which makes them stand out. They are a bit like the opposite to the black lynx tips of the wild caracal.  He lives in France with his human: Adriana Piraino. He was born on 7th November 2020. He is still very young. They say Maine Coons reach adulthood at around the age of 4. He is going to be enormous as well. Richie with Adriana. Photo: Instagram Richie was bred b
Read more