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A Paint Horse Owner's Guide to Demystifying the Genetics Of 083-088-GeneticSeries_Part1 Modifi ed: December 10, 2015 10:58 AM Files:Publications:PHJ:01.16 Journal:01.16-Sent to Rip:083-088-GeneticSeries_Part1.indd APHA FILE PHOTO A Paint Horse owner’s guide to demystifying Genetics IQ the genetics of spott ing patt erns. Part 1 of 2 By IRENE STAMATELAKYS efore DNA testing became com- it’s challenging to keep up with the latest be thought of as strings of genes—the mon—before we downloaded developments. building blocks in all living organisms Bforms and pulled mane hairs and With that in mind, the Paint Horse that determine visible traits, like hair received results via email—Paint Horse Journal has developed a two-part series color, and non-visible traits, like blood breeders relied on collective wisdom and to increase your genetics IQ. For nov- type. A horse has 64 chromosome pairs, trial and error in their quest to produce ices, we’ll bring you up to speed on the inheriting half from the sire and half those all-so-desirable colored foals. Breed- essentials. For genetics buff s, we’ll shed from the dam. ers needed to experiment for years before light on some of the latest developments Each gene has an address—a spe- confi rming a horse was a good, great or and challenges facing researchers and cifi c site on a specifi c chromosome. poor color producer. Foaling time brought breeders. And for everyone, we’ll attempt We call this address a locus, with the lots of pleasant surprises, along with some to answer the question, “How can these plural being loci. Quite often, geneti- disappointment and occasional heartache. genes enhance my Paint Horse breeding cists use the locus name to refer to a While the arrival and development of program?” gene. And when a gene comes in diff er- DNA testing has eliminated a lot of the ent forms, those variations are called guesswork, many of us have a limited Genetics Jargon alleles. understanding of the tools science has to Before we get into spotting specif- For example, the Tobiano locus has off er. Others have a good handle on Paint ics, let’s start with some basic genet- two alleles: a tobiano allele (TO) and a Horse genetics, but advances and discov- ics terminology you probably learned non-tobiano allele (n). Either can occur at eries are happening at such a fast rate that in biology class. Chromosomes can the Tobiano locus, but each chromosome PAINT HORSE JOURNAL | JANUARY 2016 83 083-088-GeneticSeries_Part1 Modifi ed: December 10, 2015 10:58 AM Files:Publications:PHJ:01.16 Journal:01.16-Sent to Rip:083-088-GeneticSeries_Part1.indd can only carry one allele. Because chro- A recessive gene is only expressed with how we think that gene should look The Dominant Whites mosomes come in pairs, a horse carries in the homozygous state. Overo Lethal phenotypically. All of these mutations are found on two alleles at a particular locus. White Syndrome, for example, is a Now that you’ve reviewed the lingo, the KIT gene, located on Chromosome The Dominant Whites If a gene is dominant, like Tobiano, recessive condition; none of the known let’s take a look at the known mutations 3. Researchers named them Dominant Position on the horse only needs one copy of the allele spotting patterns are fully recessive. responsible for Paint Horse spotting pat- White, although horse breeders might Name KIT Gene Breed from one parent to have a tobiano spot- Finally, phenotype is what some- terns: “The Big Six” and “The Dominant use other terms to describe the patterns. Dominant White 1 (W1) Exon 15 Franches-Montagnes Horse: White horses ting pattern. For instance, a heterozygous thing looks like on the outside—for our Whites.” It’s important to note that these The alleles are dominant, meaning a trace back to Cigale, a mare foaled in 1957 tobiano (n/TO) has one Tobiano allele; a purposes, that’s the outward expres- genes do not determine whether or not horse only needs to inherit one copy Dominant White 2 (W2) Exon 2 Thoroughbred: White horses trace back homozygous tobiano (TO/TO) has two. sion of a white spotting pattern in Paint skin cells can produce melanin, which of the mutation to produce phenotypes to KY Colonel, a chestnut with extensive white markings, foaled in 1946. Some genes are incompletely domi- Horses. Genotype refers to the horse’s is a class of pigment that’s responsible that range from slightly increased face nant. This means that heterozygotes genetic makeup. Sometimes a horse can for the dark color of skin, hair and more. and leg markings to sabino-like to com- Dominant White 3 (W3) Exon 4 Arabian: Spotted horses trace back to R Khasper, a near-white stallion foaled in 1996. do not look the same as homozygotes. carry a spotting pattern gene, but not Rather, these genes infl uence the migra- pletely white. We’ve bolded the entries Dominant White 4 (W4) Exon 12 Camarillo White Horse: White horses Sabino 1 is one example, which we’ll express it in a way that’s consistent tion of melanocytes (melanin pigment- for three Dominant White genes known trace back to Sultan, a stallion foaled in 1912. describe later. producing cells) in the embryo. to exist in the Paint Horse breed, and Dominant White 5 (W5) Exon 15 Thoroughbred: Horses trace back to show examples of each below. (see photo at left ) Puchilingui, a stallion foaled in 1984 with a sabino-like coat pattern, and his offspring. Dominant White 6 (W6) Exon 5 Thoroughbred: Identifi ed in a single white The Big Six horse. Dominant White 5 (W5) Dominant White 7 (W7) Intron 2 Thoroughbred: Identifi ed in a partially white fi lly. Dominant White 8 (W8) Intron 15 Icelandic Horse: Identifi ed in a partially white horse with mottled phenotype. Dominant White 9 (W9) Exon 12 Holsteiner: Identifi ed in a completely white horse. Dominant White 10 (W10) Exon 7 Paint/Quarter Horse: Horses trace back (see photo at left ) to GQ Santana, a stallion foaled in 2000, CASSIDY COBARR CASSIDY COBARR CASSIDY COURTESY LAUREN BORK LAUREN COURTESY and his offspring; expression ranges from nearly all-white to horses with face/leg white and belly spots. Dominant White 11 (W11) Intron 19 South German Draft Horse: Identifi ed in a DON TROUT completely white stallion and three white offspring. Dominant White 10 (W10) Dominant White 12 (W12) Exon 3 Thoroughbred: Identifi ed in a single horse with sabino-like pattern. Dominant White 13 (W13) Intron 17 Quarter Horse/Peruvian Paso: Identifi ed in a crossbred family with two white animals. Dominant White 14 (W14) Exon 17 Thoroughbred: Identifi ed in a completely white horse. Dominant White 15 (W15) Exon 10 Arabian: Identifi ed in a single horse with partial depigmentation. Dominant White 16 (W16) Exon 7 Oldenburg: Identifi ed in a family with three almost completely white horses. Dominant White 17 (W17) Exon 12 Japanese Draft Horse: Identifi ed in a com- pletely white horse with one blue eye. KELLY GRAPHICS LLC KELLY Dominant White 18 (W18) Intron 8 Swiss Warmblood: Identifi ed in a single Dominant White 20 (W20) horse with extended white speckled areas. CASSIDY COBARR CASSIDY SUSANNA COURTESY MARINELLI COURTESY BAR K 2 RANCH BAR COURTESY Dominant White 19 (W19) Exon 8 Part-Bred Arabian: Horses have bald faces, extended white legs and irregular belly spots. Dominant White 20 (W20) Exon 14 Multiple Breeds: Very common mutation; (see photo at left ) incomplete dominant trait. Markings might include a wide blaze, leg markings and small belly spots. Has a subtle effect on depig- mentation with a stronger effect on bays than sorrels. Living homozygotes have been found and tend to have more white. Dominant White 21 (W21) Exon 17 Icelandic Horse: Identifi ed in a single horse with a sabino-like pattern. COURTESY KRISTEN MEYERS KRISTEN COURTESY PAINT HORSE JOURNAL | JANUARY 2016 85 083-088-GeneticSeries_Part1 Modified: December 10, 2015 10:58 AM Files:Publications:PHJ:01.16 Journal:01.16-Sent to Rip:083-088-GeneticSeries_Part1.indd One of the biggest challenges facing researchers and Paint Horse breeders alike is the nomenclature of spotting patterns. CASSIDY COBARR COBARR CASSIDY GAIL SHAW CASSIDY COBARR COBARR CASSIDY The only completely dominant white spotting gene isTobiano , which means a horse only It stands to reason that homozygosity increases the amount of While many Splash White carriers might look phenotypically similar, the needs one copy of the gene to inherit the trait. white markings—that seems to be the case for this 2015 cropout three known genes are very different. Hello Big Chex, a 2012 chestnut overo colt by A Splash Of Silver (QH) and out of Dun Gone Classy (QH). stallion by Big Chex To Cash and out of Custom Princess (QH), carries a Both parents are n/SW1 and minimally colored; this loud colt car- single copy of the SW1 gene and is negative for other known white-spotting ries two copies of the Splash White 1 gene. patterns. The Nomenclature a dominant form of white spotting, which Nightmare ranges from extended face and leg mark- Color Genetics One of the biggest challenges fac- ings to a completely white coat. mutation. But other W mutations vary talk to horse people, and they call it some- ing researchers and Paint Horse breed- Researchers decided to call the gene greatly in their expression—not all look thing entirely different.” Bookshelf ers alike is the nomenclature of spotting Sabino 1 for two reasons, Samantha like GQ Santana; they can range from a patterns.
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