What is OHd in Scottish cats? - briefly
"OHd in Scottish cats refers to a specific gene mutation that causes dilution of coat color, resulting in a distinctive blue-gray hue in their fur."
What is OHd in Scottish cats? - in detail
The term "OHd" in relation to Scottish cats refers to the genetic condition known as Oculocutaneous Hypopigmentation Disorder (OHd). This disorder affects the pigmentation of both the eyes and skin, leading to a distinctive appearance among affected cats.
Scottish cats, particularly those of the Scottish Fold breed, are predisposed to this condition due to their unique genetic makeup. Oculocutaneous Hypopigmentation Disorder is caused by a mutation in the TYRP1 gene, which plays a crucial role in melanin production. Melanin is the pigment responsible for the color of skin and eyes, as well as hair. When this gene is affected, it results in reduced or absent melanin, leading to various degrees of hypopigmentation.
In Scottish cats with OHd, this manifests as blue eyes and a lighter coat color compared to their unaffected littermates. The extent of the hypopigmentation can vary, with some cats showing only slight changes while others may have significantly reduced pigmentation. This condition is typically apparent from birth or shortly thereafter, making it noticeable during the kitten stage.
It's important to note that OHd does not adversely affect the health of Scottish cats beyond their distinctive appearance. The condition is purely cosmetic and does not cause any functional impairments. However, breeders and cat enthusiasts should be aware of this genetic trait when planning matings or selecting kittens for show purposes.
Genetic testing is available to identify carriers of the OHd mutation, which can help in responsible breeding practices. By understanding and managing this condition, breeders can ensure that Scottish cats continue to thrive while maintaining their unique characteristics.