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Locus Information: T locus

Inheritance: incomplete autosomal-dominant

→ Incomplete means that horses with only one copy of the variant (T/n) will show a less pronounced phenotype than horses with two copies of the variant (T/T).

General Information:

  • Big white patches with distinct edges.
  • Usually have a colored head and white patches often reach over back.
  • Tobiano pattern may obscure Frame Overo or other patterns.
  • Horses with two copies of the variant (T/T) usually have an increased amount of white.
  • Although rare, mostly/completely solid horses can be positive for Tobiano.  They may be called “cryptic” or “hidden” Tobianos.
  • Tobiano is found in many different breeds.

Possible Genotypes:

Genotype: Effects:
n/n No Tobiano mutation.
T/n The horse has one copy of the T-variant → pattern with distinct edges and big patches. Commonly colored head (maybe with white markings).
T/T The horse has two copies of the T-variant → pattern with distinct edges, big patches. Very similar to heterozygous (T/n) individuals.


Test information: This test detects a chromosomal inversion near the KIT gene.

Brooks, S.A., Lear, T.L., Adelson, D.L., Bailey, E.: A chromosome inversion near the KIT gene and the Tobiano spotting pattern in horses. Cytogenet Genome Res.,119(3-4):225-30, 2007. Doi: 10.1159/000112065.

Further information is available at Online Mendelian Inheritance in Animals.

Tobiano with “ink spots” or “paw prints”.

Test #: H208

Samples: Blood, Hair

Price: 35 € (net)

Time required: 10-14 days

Examples for Tobiano phenotypes with a bay base color. Other variants may influence the amount of white in this pattern.
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