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Locus Information: C locus

Inheritance: autosomal recessive

→ Only animals with two copies of the Pearl factor (sun/sun) or animals with one copy “Sunshine” in combination with one copy “Cream” (Cr/sun) show the Sunshine dilution.

General Information:

  • Sunshine is a dilution factor.
  • Dilution affects coat as well as mane and tail.
  • Phenotype is very similar to the Pearl dilution.
  • Causal mutation affects the same gene as the Cream mutation.
  • Recently found in a Standardbred x Tennessee Walking Horse cross.

Possible Genotypes:

Genotype: Effect:
N/N No Sunshine mutation.
N/sun One copy of the Sunshine variant → the horse does not show the diluted coat color.
sun/sun Two copies of the Sunshine variant → the horse does show the Sunshine dilution. Phenotype is supposed to be similar to Pearl dilution.
Cr/sun One copy of the Sunshine variant with one copy of the Cream variant → the horse shows a phenotype similar to a horse with two copies of Cream (Cr/Cr).


Test Information: This test detects a single base pair change in the SLC45A2 gene.

Holl et al. A candidate gene approach identifies variants in SLC45A2 that explain dilute phenotypes, pearl, and sunshine, in compound heterozygote horses. Anim Genet 50(3):271-274, 2019

Further Information are available at: Online Mendelian Inheritance in Animals.

Test #: H229

Samples: Blood, Hair

Price: 35 € (net)

Time required: 10-14 days

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