Agouti is found on chromosome A3.Ī major exception to the solid masking of the tabby pattern exists: the O allele of the O/o locus is epistatic over the aa genotype. As a result, the non-agouti genotype (aa) is solid and has no obvious tabby pattern (sometimes a suggestion of the underlying pattern, called "ghost striping", can be seen, especially in bright slanted light on kittens and on the legs, tail and sometimes elsewhere on adults). The non-agouti or "hypermelanistic" allele, a, does not initiate this shift in the pigmentation pathway and so homozygotes aa have pigment production throughout the entire growth cycle of the hair-along its full length. The wild-type A produces the agouti shift phenomenon, which causes hairs to be banded with black and an orangish/reddish brown, this revealing the underlying tabby pattern (which is determined by the T alleles at the separate tabby gene). The Agouti gene, with its dominant A allele and recessive a allele, controls the coding for agouti signaling protein (ASIP Q865F0). This is probably related to the phenomenon known as "tarnishing" in silvers. These cats resemble shaded or tipped goldens, but are genetically shaded or tipped silvers.
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