White patterning in horses is known as Dominant White or White. Los patrones dominantes en blanco son variables, desde manchas mínimas tipo Sabino hasta caballos completamente blancos. El color de los ojos de los caballos blancos dominantes es marrón. Hay alrededor de 20 mutaciones diferentes identificadas que están asociadas con patrones blancos, todas las mutaciones se encuentran en el gen KIT. A excepción de W20, la mayoría de las mutaciones blancas dominantes conocidas surgieron recientemente y están restringidas a líneas específicas dentro de razas. La prueba Color de Capa Blanco Dominante 1 (P591) analiza la mutación conocida como W18 en el gen KIT. Esta prueba detecta dos variantes (alelos). El alelo W18 es dominante. Una o dos copias del alelo W18 dan como resultado caballos que muestran cierto grado de manchas blancas, pero el patrón específico no se puede predecir. El alelo N es recesivo y no tiene efecto en el color básico.
The Coat Colour Dominant White 1 test encloses the following results, in this scheme the results of the Coat Colour Dominant White 1 test are shown in combination with the possible results for the tests that determine the basic Coat Colour (Coat Colour Chestnut and Coat Colour Agouti test):
|
Result Dominant White 1 |
Result Chestnut + Agouti |
Coat Colour |
Descripción |
|---|---|---|---|
|
N/N |
e/e + A/A, A/a or a/a
|
Chestnut, Sorrel
|
Not Dominant White. The basic colour chestnut/sorrel is not modified unless modified by other colour modifying genes. It can only pass on allele N to its offspring. |
|
N/N |
E/E or E/e + A/A or A/a |
Bay, Brown |
Not Dominant White. The basic colour bay/brown is not modified unless modified by other colour modifying genes. It can only pass on allele N to its offspring. |
|
N/N |
E/E or E/e + a/a |
Black |
Not Dominant White. The basic colour black is not modified unless modified by other colour modifying genes. It can only pass on allele N to its offspring. |
|
N/W18 |
e/e + A/A, A/a or a/a
|
Chestnut/sorrel with Dominant White pattern |
Dominant White pattern. One copy of the W18 allele. The horse will display some degree of white spotting but the specific pattern cannot be predicted, unless modified by other colour modifying genes. It can pass on either allele N or W18 to its offspring. |
|
N/W18 |
E/E or E/e + A/A or A/a |
Brown/bay with Dominant White pattern |
Dominant White pattern. One copy of the W18 allele. The horse will display some degree of white spotting but the specific pattern cannot be predicted, unless modified by other colour modifying genes. It can pass on either allele N or W18 to its offspring. |
|
N/W18 |
E/E or E/e + a/a |
Black with Dominant White pattern |
Dominant White pattern. One copy of the W18 allele. The horse will display some degree of white spotting but the specific pattern cannot be predicted, unless modified by other colour modifying genes. It can pass on either allele N or W18 to its offspring. |
|
W18/W18 |
e/e + A/A, A/a or a/a |
Chestnut/sorrel with Dominant White pattern |
Dominant White pattern. Two copies of the W18 allele. The horse will display some degree of white spotting but the specific pattern cannot be predicted, unless modified by other colour modifying genes. It can only pass on allele W18 to its offspring. |
|
W18/W18 |
E/E or E/e + A/A or A/a |
Brown/bay with Dominant White pattern |
Dominant White pattern. Two copies of the W18 allele. The horse will display some degree of white spotting but the specific pattern cannot be predicted, unless modified by other colour modifying genes. It can only pass on allele W18 to its offspring. |
|
W18/W18 |
E/E or E/e + a/a |
Black with Dominant White pattern |
Dominant White pattern. Two copies of the W18 allele. The horse will display some degree of white spotting but the specific pattern cannot be predicted, unless modified by other colour modifying genes. It can only pass on allele W18 to its offspring. |