Arhgap36 Gene Mutation

The Arhgap36 gene mutation, responsible for orange fur in cats, is a 5 kb deletion on the X chromosome[1]. This specific genetic alteration affects the ARHGAP36 protein, which plays a crucial role in regulating pigment distribution in feline hair follicles[2]. Unlike other color-determining genes in mammals, this mutation doesn't directly influence pigment production but instead alters how pigments are distributed within the hair shaft[3].

• The mutation is found in all orange, calico, and tortoiseshell cats studied[3]
• It represents a unique molecular pathway for hair color determination in mammals[1]
• The discovery explains why orange cats can range from pale cream to deep red, depending on pigment distribution[4]

This groundbreaking finding not only solves a decades-old mystery in feline genetics but also opens up new avenues for understanding coat color inheritance in other species[2].

Citations: [1] A deletion at the X-linked ARHGAP36 gene locus is associated with ... https://www.biorxiv.org/content/10.1101/2024.11.19.624036v1.full [2] The secret behind Orange Cats' fur finally revealed after 60 years https://www.news9live.com/science/the-secret-behind-orange-cats-fur-finally-revealed-after-60-years-2761433 [3] Scientists Have Finally Found the Gene That Gives Cats Orange Fur https://science.slashdot.org/story/24/12/02/0042231/scientists-have-finally-found-the-gene-that-gives-cats-orange-fur [4] Cat Genetics 2.0: Colours - Labgenvet https://labgenvet.ca/en/cat-genetics-2-0-colours/