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The agouti signaling protein interacts with the melanocortin 1 receptor to switch between black and red pigments, creating a banding pattern in individual hairs. Mutations in the agouti signaling protein gene (ASIP) prevent this switch from occurring, resulting in hairs of uniform color.
Agouti coloration genetics. A cat hair showing light and dark bands caused by alternating production of agouti-signaling protein and α-MSH. The agouti gene, the Agouti-signaling protein (ASIP) is responsible for variations in color in many species. Agouti works with extension to regulate the color of melanin which is produced in hairs.
Below is a table of the coat color genes and DNA tests offered by the Veterinary Genetics Laboratory. Non-agouti, aa, cats are solid (self) in color. Tabby patterns are difficult to identify. Gradual replacement of eumelanin with phaeomelanin, in Norwegian Forest cats.
In particular, the Brown Tabby patterns are genetically Black, but the selection of individuals with strong rufousing has produced a rich brown color in the ticked hairs. The mutation that causes solid color is called non-agouti (a/a), and is recessive.
These cats had pale, wide-banded undercoats, rusty tabby markings (even on silvers to some extent), incomplete nose-liner, and a lot of white on the front of their faces and down their throats. They were referred to as “Sunshine” to differentiate them from traditional shaded goldens.
The Agouti gene, also known as the ASIP gene, is one such gene that influences coat color in animals. One of the key functions of the Agouti gene is to regulate the production of melanin, the pigment responsible for determining the color of skin, hair, and eyes.
When a cat has a tabby pattern, the dark markings are made of solid hairs of the base color while the fur in between the markings is composed of agouti hairs. Tabby cats can come in any existing cat colors, such as black, blue, chocolate, lilac, cinnamon, and fawn.
A cat hair showing agouti coloration. A domestic rabbit with agouti coloration. Agouti is a type of fur coloration in which each hair displays two or more bands of pigmentation. [1][2] The overall appearance of agouti fur is usually gray or dull brown, [3] although dull yellow is also possible.
In cats with the agouti variant, different pigments are deposited in the hair shaft during different parts of the growth cycle, producing banded hairs. In non-agouti cats, individual hairs remain one solid, uniform color.
The homozygous recessive genotype when combined with the agouti gene (iiA-), produces tabby coloration, which can vary along a spectrum ranging from a deeply patterned brown tabby, to a lighter "golden tabby", to the very lightly colored shaded or chinchilla golden colors.