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Greying
Test number: 8159 (this test number replaces the old 8159H)
Gene: STX17 Price: £ 66.00 (including VAT)
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Description |
Grey / Greying
The Grey phenotype in horses causes progressive fading of hair colour. Foals are born with standard colour, but as they become older, they lose pigmentation and their hair colour changes to silver (grey), white, or appear like 'flea-bitten.' and by the age of 6-8 the horse becomes almost white. Importantly, the skin's colour is unaltered. The gray gene does not affect skin or eye colour, so grey horses typically have dark skin and eyes, as opposed to the unpigmented pink skin of true white horse
The Grey gene is dominant, which means that if a horse has the Grey phenotype, one of its parents must also have the Grey gene.
The gray gene (G) is an autosomal dominant gene, therefore, a horse which has only one copy of the gray allele, even if it has a gene for another coloring, will always become gray. If a gray horse is homozygous (GG), meaning that it has a gray allele from both parents, it will always produce gray offspring. However, if a gray horse is heterozygous (Gg), meaning it inherits one copy of the recessive gene (g), that animal may produce offspring who are not gray (depending on what color gene an offspring inherits from its other parent). A gray horse must have at least one gray parent. It is now possible to determine whether a horse is homozygous or heterozygous for gray ot if the horse does not carry the gene at all. This is useful to know whether a non gray foal will become gray or not and since, graying is increases the risk of developing melanoma, this test is particularly useful.
Gray is caused by a mutation in the STX17 gene which is known to increase the risk for melanoma in horses; About 75% of grey horses over 15 years of age have a benign form of melanoma that in some cases develops into a malignant melanoma.
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Trait of Inheritance |
Greying with age in horses is an autosomal dominant trait, associated with loss of hair pigmentation, melanoma and vitiligo-like depigmentation
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Inheritance : AUTOSOMAL
DOMINANT
trait
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Sample Requirements |
Hair Sample from mane with roots (approx 30 hairs) or 1 ml whole blood in EDTA tube.
How to obtain a viable hair sample
Pull around 30 hairs from the mane of the horse with the roots (in faols hair from the tail maybe taken). Wrap the hairs around your finger or a comb, as close as possible to the skin to ensure you obtain the hair roots. Keep dry, put in a bag, label the bag with the horse name, test (s) required. Place in an envelope and send back to us together with the order form. Broken or cut off hair will not be accepted.
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Price
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£ 66.00 (including VAT)
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See also: |
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Coat Colour chestnut (Red Factor)
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Appaloosa Pattern 1 (PATN-1) *
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Tobiano (Tobiano Spttings) / (Paint, Pinto, Tinker)
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Coat Colour Champagne
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Sabino -1
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Dominant white (GQ Santana dominant white W5, W10, W13, W20 and W22)*
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Dun Zygosity
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Leopard complex
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Pearl
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Roan Zygosity*
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Splashed white (SW1 , SW2 , SW3 and SW4)
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Coat Colour black / Bay (Agouti)
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Camarillo White - W4
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Curly Coat
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Coat colour Sunshire Dilution / Dilute
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Mushroom
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Silver Coat Colour Dilution / MCOA
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Brindle 1 (BR1) (irregular vertical striped pattern )
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Splashed white (SW5 , SW6) *
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Bundle: Basic Coat Colour (Agouti + Red Factor / Chestnut )
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Bundle: Dilutions Coat Colour (Cream, Champagne, Dun Zygosity, Silver, Pearl)
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Bundle: White Patterns Coat Colour (LWO, Leopard complex, Appaloosa Pattern, Tobiano, Splashed White, Sabino)
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Snowdrop dilution
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Incontinentia Pigmenti (IP)
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Coat Colour Cream / Dilution / Dilute
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