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W20 white markings (W20)

Summary

W20 is a version of the KIT gene that is thought to cause relatively subtle white markings such as a blaze and socks - and sometimes even less white. It has a white-increasing effect when it is inherited in combination with other white marking genes, particularly sabino 1 and the other W genes.

W20 has been found in a very wide range of horse breeds. The following are just some of the horse and pony breeds where some individuals have tested positive to W20: Thoroughbreds, Welsh Ponies, Quarter Horses, Appaloosas, Warmbloods, Gypsy horses, Clydesdales, Noriker, Miniature Horses... the list goes on.

If your horse has a blaze and one or more socks, or perhaps a few white belly spots that have not been explained by other white marking genes, test for W20 as well as sabino 1.

Gene or region and technical reference

Gene: KIT (causative). Reference: Hauswirth et al. (2013)

Reported alleles

n. Test developed using animal controls.

W20. Test developed using animal cases.

Panels: groups of tests that are often ordered together

This test is in the Arabian health & colour panel.

This test is in the full colour panel.

This test is in the Gypsy health & colour panel.

This test is in the Miniature health & colour panel.

This test is in the patterns panel.

This test is in the QH health & colour panel.


horse

Fred, a Warmblood, is homozygous for W20. He has four socks, a blaze, a belly splash and birdcatcher spots.

Order tests

There is a one-off sample processing fee of $40 per animal plus the cost of your tests.

How many animals are you testing? Discount or society code:


Pedigree

$33 DNA profile ... more


Panels


Colour panels

$40 Dilutions panel ... more

$120 Full colour panel ... more

$70 Patterns panel ... more


Panels by breed

$115 Arabian health & colour ... more

$50 Arabian health panel ... more

$40 Friesian health & colour ... more

$120 Gypsy health & colour ... more

$50 Miniature ACAN panel ... more

$250 Miniature health & colour ... more

$160 QH health & colour ... more

$90 QH health panel ... more


Good moves


Gaited horses

$9 Lateral gait marker ... more


Good looks


Coat colour

$9 Agouti (bay factor) (agouti) ... more

$9 Red/black ... more


Coat pattern

$9 Frame overo/lethal white syndrome (OLWS) ... more

$9 Grey/melanoma ... more

$9 Lp/Appaloosa/night blindness (CSNB) ... more

$9 PATN1 coat pattern modifier (PATN1) ... more

$9 Roan marker ... more

$9 Sabino 1 ... more

$9 Splashed white 1/deafness (SW1) ... more

$9 Splashed white 2/deafness (SW2) ... more

$9 Splashed white 3/deafness (SW3) ... more

$9 Tobiano ... more

$9 W13 dominant white (W13) ... more

$9 W20 white markings (W20)

$9 W22 dominant white (W22) ... more

$9 W25 dominant white (W25) ... more

$9 W26 dominant white (W26) ... more

$9 W27 dominant white (W27) ... more


Good health


Paint horses

$9 Splashed white 3/deafness (SW3) ... more


Good looks


Colour dilution

$9 Champagne ... more

$9 Cream ... more

$9 Dun and d1 (nd1) (dun/d1) ... more

$9 Pearl ... more

$9 Taffy/silver/eye abnormalities (MCOA/silver) ... more


Good health


Multiple breeds

$14 Foal immunodeficiency syndrome (FIS) ... more

$14 Fragile foal syndrome (FFS) ... more

$9 Frame overo/lethal white syndrome (OLWS) ... more

$9 Grey/melanoma ... more

$9 Lp/Appaloosa/night blindness (CSNB) ... more

$14 Polysaccharide storage myopathy 1 (PSSM1) ... more

$9 Splashed white 1/deafness (SW1) ... more

$9 Taffy/silver/eye abnormalities (MCOA/silver) ... more


Pure- and part-bred Akhal-Tekes

$14 Naked foal syndrome (NFS) ... more


Pure- and part-bred Arabians

$14 Cerebellar abiotrophy (CA) ... more

$14 Lavender foal syndrome (LFS) ... more

$14 Occipitoatlantoaxial malformation (OAAM) ... more

$14 Severe combined immune deficiency (SCID) ... more


Pure- and part-bred Connemaras

$14 Hoof wall separation disease (HWSD) ... more


Pure- and part-bred Friesians

$14 Friesian dwarfism ... more

$14 Hydrocephalus ... more


Pure- and part-bred Miniature horses

$14 D1 form of Miniature dwarfism (D1) ... more

$14 D2 form of Miniature dwarfism (D2) ... more

$14 D3 form of Miniature dwarfism (D3) ... more

$14 D4 form of Miniature dwarfism (D4) ... more

$140 Skeletal atavism (SA) ... more


Pure- and part-bred Quarter Horses and Paints

$14 Glycogen branching enzyme deficiency (GBED) ... more

$14 Hereditary equine regional dermal asthenia (HERDA) ... more

$14 Hyperkalaemic periodic paralysis (HYPP) ... more

$14 Immune mediated myositis (IMM) ... more

$14 Malignant hyperthermia (MH) ... more

$9 Splashed white 2/deafness (SW2) ... more


Pure- and part-bred Saddlebreds

$14 Junctional epidermolysis bullosa (JEB2) ... more

Tests can be in the list more than once when the gene in question has more than one effect. It is OK to select the same test once or more than once, the price is the same.