• DNA Profiling & 
    Parentage Verification
    We offer DNA profiling which can be used to confirm parentage or the identity of your horse.
    Find out how
  • Genetic Diagnostic Testing
    We offer testing for known mutations that cause genetic disorders. This can be used to prevent the birth of a foal affected by one of these disorders.
    Find out how
  • Coat Colour &
    Pattern Testing
    Our coat colour or pattern testing can be used as an aid for selection to produce a foal of a particular colour.
    Find out how
  • Infectious Disease Testing
    The EGRC is currently executing a trial of PCR detection of the pre-breeding panel pathogens. This service is for veterinarians only.
    Find out how

Dominant White W10

W10 is one of the many mutations of the KIT gene that cause the Dominant White phenotype.

Alternate names

Dominant White 10, White spotting W10



Breeds known to carry this mutation

Quarter Horses related to the founder GQ Santana, born in 2000.

Inheritance pattern

Autosomal dominant


W10 causes its carriers to have a significant amount of white, ranging from a spotting pattern with extensive white on the face and legs, to the horse being completely white.

Interpretation of results

n/n: Horse does not carry the W10 mutation

W10/n: Horse carries one copy of the W10 mutation and will have a significant amount of white in its coat. It will pass the W10 mutation on to approximately half of its offspring.

W10/W10: Horse carries two copies of the W10 mutation. Please note that this is a theoretical genotype, and no horse has been identified as carrying two W10 mutations. It is suspected that embryos carrying two W10 mutations are not viable and die early in the pregnancy.


Haase et al. Seven novel KIT mutations in horses with white coat colour phenotypes. Animal Genetics 2009; 40:623-629. doi:10.1111/j.1365-2052.2009.01893.

Powered by © 2023 Racing Australia Limited (ACN 105 994 330)