Sabino-1 (Coat colour pattern Horse)
Horses with the Sabino-1 pattern often have white patches of different sizes with 'indistinct/fringed' borders especially on the head, belly and legs. Many horses have often white ticked hair on the rest of the body (animals with one copy of the gene: Sb1/n). Horses with two copies of the mutation (homozygous) are usually completely white.
Sabino-1 is a special form of White Spotting/Dominant White and is the most common, but not the only mutation causing this spotting pattern. Should a horse show a Sabino-like pattern but does not have an Sb1 mutation, other mutations in the KIT gene, the so-called W-variants, could be responsible.
- White patches of different sizes with indistinct/fringed' borders (especially head, belly and legs).
- Horses with one copy of the mutation (heterozygous) have often white ticked hair (varnish white).
- Horses with two copies of the mutation (homozygous) are usually completely white.
- Sb1 is the most common, but not the only mutation causing this coat pattern.
- Sabino-1 (Sb1) is a special form of White Spotting/Dominant White.
- If a horse shows a Sabino-like spotting pattern but does not have an Sb1 mutation, other mutations in the KIT gene, the so-called W-variants, could be responsible or mutations not yet known.
- Breeds that may have the Sabino-1 coat pattern are: Tennessee Walking Horse, Miniature Horses, Paints, Aztec, Missouri Foxtrotters, Shetland, Spanish Mustang and Pony of the Americas
Locus Information: SB-Locus
This test detects the change of a single basepair in the KIT gene.
Genotype and Lab Report
Inheritance: incomplete autosomal-dominant
→ Incomplete means that animals with only one copy of the variant (Sb1/n) will show a less pronounced phenotype than horses with two copies of the variant (Sb1/Sb1).
n/n = No copy of the Sabino-1-variant
No coat pattern.
Sb1/n = One copy of the Sb1-variant
Pattern with indistinct white patches and/or white on head and legs. Phenotype is very variable.
Sb1/Sb1 = Two copies of the Sb1-variant
Often completely white coat or only small remnants of color (often ears).