The Dense pigment gene, D/d, codes for melanophilin ( MLPH A0SJ36), a protein involved in the transportation and deposition of pigment into a growing hair. It has been narrowed down to a 3.5 Mb stretch on the X chromosome in 2009. The precise identity of the gene at the Orange locus is unknown. "Solid" red show cats are usually low contrast ticked tabbies. Orange is epistatic to nonagouti, so all red cats are tabbies. Unidentified "rufousing polygenes" are theorized to be the reason for this variance. Red show cats have a deep orange color, but it can also present as a yellow or light ginger color. Other common names include yellow, ginger, and marmalade. The pelt color commonly referred to as "orange" is scientifically known as red. In one study, less than a third of male calicos had a simple XXY Klinefelter's karyotype, slightly more than a third were complicated XXY mosaics, and about a third had no XXY component at all. One in three thousand tortoiseshell cats are male, making the combination possible but rare- however, due to the nature of their genetics, male tortoiseshells often exhibit chromosomal abnormalities. OO results in orange fur, oo results in fur without any orange (black, brown, etc.), and Oo results in a tortoiseshell cat, in which some parts of the fur are orange and others areas non-orange. Since females have two X chromosomes, they have two alleles of this gene. Males can typically only be orange or non-orange due to only having one X chromosome. The orange allele is O, and is codominant with non-orange, o. This gene is located on the X chromosome. In cats with orange fur, phaeomelanin (red pigment) completely replaces eumelanin (black or brown pigment). The sex-linked red "Orange" locus, O/o, determines whether a cat will produce eumelanin.
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