PATN1 coat pattern modifier (PATN1)
Palouse ponies, Appaloosas and other spotted and varnish roan horses with the Lp gene can have vastly different white markings to one another. In horses positive for Lp, the PATN1 gene is strongly associated with patterns showing large amounts of white such as leopard or near-leopard markings.
While the PATN1 is strongly associated with large amounts of white, it is not thought to cause the markings.
Horses that are not positive for Lp can be tested for PATN1. It does not affect their colour, but may be useful if you are hoping for a beautifully marked spotted foal.
Gene or region and technical reference
Gene: RFWD3 (marker). Reference: Holl et al. (2015)
n. Test developed using manufactured DNA, animal controls.
PATN1. Test developed using manufactured DNA, animal cases.
The PATN1 gene is associated with more white patterning in horses that are also positive for Lp.