Twilight’s Story

Twilight’s Legacy: Advancing Health Through Equine Genetics

In 2006–2007, scientists achieved a major milestone by sequencing the complete DNA of a horse named Twilight, a Thoroughbred mare from Dr. Douglas Antczak’s herd at the Baker Institute for Animal Health. This breakthrough opened the door to powerful discoveries. Horses share more than 90 genetic diseases with humans, making them an important partner in advancing health for both species. Even more remarkable, nearly half of horse chromosomes closely match human chromosomes—allowing researchers to translate findings across species more effectively than ever before. By mapping the horse genome, scientists are improving the understanding and treatment of conditions such as lameness, lung disease, reproductive challenges, and immune disorders. Today, Twilight’s DNA continues to support research efforts around the world—driving discoveries that benefit both animals and people.