Color: Tobiano is a color pattern in which large areas of skin and hair (usually including the back and legs) are white. Some horses may have small pigmented spots in the white areas, called “paw prints” or “ink spots”.
Samples Accepted: Blood, Hair
Locus Information: TO
Test Information: This test detects a chromosomal inversion involving the KIT gene. Tobiano is autosomal dominant, and any animal with one copy of the allele will show the affect. A horse with two copies of the allele may be even more depigmented, and may have small pigmented spots called “paw prints” or “ink spots”.
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 the Online Mendelian Inheritance in Animals website.