The Devon Rex's distinctive curly coat is the result of a genetic mutation in the KRT71 gene, which is essential for hair formation. This mutation causes an alteration in the structure of the hair, giving the Devon Rex its characteristic appearance, with tight curls and a unique texture. All Devon Rexes analysed have two copies of this mutation, which means that it is fixed in the breed and determines the curly phenotype. This mutation is specific to the Devon Rex and has not been observed in other rexoid breeds or hairless varieties, highlighting its uniqueness within the breed.
