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02-21-2012, 03:21 PM
Speed Gene Makes Picking Racehorses a Safer Bet By Jason Gale A speed gene in horses is enabling thoroughbred owners to sort would-be sprinters from plodders from just a teaspoonful of the galloperıs blood. Scientists at University College Dublin matched the genetic code of 179 race winners with performance on the track to identify variants of the muscle mass-regulating myostatin gene that predict a horseıs optimum racing distance The research is the first known characterization of a gene contributing to a specific athletic trait in thoroughbreds, the authors said in the study, published Jan. 20 in the Public Library of Science Journal. Commercialization of the test may alter the course Public Library of Science Journal. Commercialization of the test may alter the course of a multibillion-dollar industry whose breeding practices have remained little changed for centuries, the researchers said"Breeders currently rely on combining successful bloodlines together, hoping that the resulting foal will contain that winning combination of genes", said Emmeline Hill 36, a geneticist at the university and the studyıs lead author. Whether those winning genes have or have not been inherited could only be surmised by observing the racing and breeding success of a horse over an extended period of years. The research was funded by Science Foundation Ireland, according to the study."For 1,000 euros ($1,400), owners may submit a 5-milliliter sample of their horseıs blood to Hills Equinome lab to test whether the animal has inherited a specific myostatin mutation conferring speed for short-distance races, staying power for middle distances or stamina for longer events over 2.1 kilometers (1.3 miles)", she middle distances or stamina for longer events over 2.1 kilometers (1.3 miles)", she said yesterday in a telephone interview Equinome was co-founded in 2009 by Hill and Jim Bolger, an Irish racehorse trainer and breeder, to commercialize the gene test and pursue research on horse and breeder, to commercialize the gene test and pursue research on horse performance genetics. The company plans to begin offering the test at the end of January, according to a university statement. The test results, returned in about three weeks, also will help breeders make better-informed decisions on which mares to mate with which stallions, and tell whether a foal has a genetic predilection for early maturity, advantageous for racing as a 2- year-old, she said. maturity, advantageous for racing as a 2- year-old, she said"It takes out a lot of the guesswork and minimizes the risk of any future investment you may have for that horse", Hill said, adding that training and racing strategies also nfluence success on the track. "This is a test for what your horse will be good at, not how good he will be." Hillıs research follows the completion three years ago of the Horse Genome Project n which more than 100 scientists in 20 countries collaborated to define the DNA in which more than 100 scientists in 20 countries collaborated to define the DNA sequence of the domestic horse. The knowledge is enabling scientists to better understand the genetic aspects of equine physiology and disease."In humans, more than 200 genes have been associated with athletic performance traits", Hill said. "Scientists expected many genes would contribute to overal traits", Hill said. "Scientists expected many genes would contribute to overall performance in horses, so it was unusual that a single gene, myostatin, was so influential", she said. nfluential", she said"Myostatin mutants are associated with so-called double muscling in cattle, mice and humans", said David Adelson, chair of the Center for Bioinformatics and Computational Genetics at the University of Adelaide in South Australia, who helped map the equine and bovine genomes. He wasnıt involved in Hills study."The variant they have identified could have an influence on racing performance, especially with respect to performance in sprints", Adelson said in an e-mail today."Efforts to identify genes linked to speed across the horse genome havenıt been successful so far, and gene-association studies in other species havenıt been able to narrow down to a handful the number of genes connected with certain quantitative narrow down to a handful the number of genes connected with certain quantitative traits such as height and weight", he said"Undoubtedly someone will try to cash in on this result with a genetic test, but ultimately the proof will come from repeated tests of association in other horse populations", Adelson said"Racehorse breeders will probably want to see more evidence of the advantage before embracing the approach", said billionaire Australian retailer Gerry Harvey, before embracing the approach", said billionaire Australian retailer Gerry Harvey, who runs more than 300 Thoroughbred brood mares at Baramul stud at Widden Valley, about 300 kilometers northwest of Sydney."I would be interested, but skeptical because of all the different theories that have come up over the years", Harvey, chairman of Harvey Norman Holdings Ltd., said in a telephone interview today. "They have got to do the practical side, and it will be many years before they have an answer." Hill and colleagues found that horses with the myostatin gene combination designated as C/C are better suited to fast, short races; those with the C/T variation tend to compete better over middle distances; and T/T animals have more stamina. C/ C and C/T were more successful as racehorses at 2 years old, earning an average of 5.5 times more prize money than T/T horses at that age, the authors said For bettors, the genetic information isnıt likely to yield any advantage anytime soon"This information is for owners only", Hill said. "If anyone wants to reveal the genetic type of their horse, then thatıs at their discretion."