Cells at San Diego Zoo lead to cloning of endangered horse

National & World News

This Sept. 1, 2020 photo provided by San Diego Zoo Global shows Kurt, a tiny horse who is actually a clone. Little Kurt looks like any other baby horse as he frolics playfully in his pen. But the 2-month-old, dun-colored colt was created by fusing cells taken from an endangered Przewalski’s horse at the San Diego Zoo in 1980. The cells were infused with an egg from a domestic horse that gave birth to Kurt two months ago. The baby boy was named for Kurt Benirschke, a founder of the San Diego Zoo’s Frozen Zoo, where thousands of cell cultures are stored. Scientists hope he’ll help restore the Przewalski’s population, which numbers only about 2,000. (Christine Simmons/San Diego Zoo Global via AP)

SAN DIEGO (AP) — Little Kurt looks like any other baby horse as he frolics playfully in his pen. He isn’t afraid to kick or head-butt an intruder who gets in his way and, when he’s hungry, dashes over to his mother for milk.

But 2-month-old Kurt differs from every other baby horse of his kind in one distinct way: He’s a clone.

The rare, endangered Przewalski’s horse was created from cells taken from a stallion that had sat frozen at the San Diego Zoo for 40 years before they were fused with an egg from a domestic horse.

With the egg’s nucleus removed, ensuring Kurt would be basically all Przewalski’s horse, they were implanted in the mare who would become his mom on Aug. 6.

The result, officials say, was the world’s first cloned Przewalski’s horse.

Scientists have cloned nearly two dozen kinds of mammals, including dogs, cats, pigs, cows and polo ponies. In 2018, researchers in China created monkeys for the first time using the cloning techniques that produced Dolly the sheep.

The zoo sees Kurt’s birth as a milestone in efforts to restore the population of the horse also known as the Asiatic Wild Horse or Mongolian Wild Horse. The small, stocky animals (they stand only about 4 to 5 feet tall at the withers) are believed extinct in the wild and number only about 2,000 in zoos and wildlife habitats. Their limited gene pool puts them at a reproductive disadvantage.

“This colt is expected to be one of the most genetically important individuals of his species,” Bob Wiese, chief life sciences officer at San Diego Zoo Global, which operates the zoo, said in a statement. “We are hopeful that he will bring back genetic variation important for the future of the Przewalski’s horse population.”

Although only 2 months old, Kurt’s birth was made possible in 1980 when cells were taken from a 5-year-old stallion and put in deep freeze at San Diego’s Frozen Zoo facility. His father died in 1998.

Kurt was named for Kurt Benirschke, who played a key role in founding the Frozen Zoo with its extensive research program and cell cultures.

“A central tenet of the Frozen Zoo, when it was established by Dr. Benirschke, was that it would be used for purposes not possible at the time,” said Oliver Ryder, director of genetics at San Diego Zoo Global.

The zoo worked in collaboration with the California conservation group Revive & Restore and the Texas-based company ViaGen Equine in creating Kurt.

He was born at a veterinary facility in Texas where he’ll continue to live with his mother for most likely another year.

Eventually he’ll be integrated into the zoo’s Przewalski’s horse population, where it’s hoped someday he’ll become a father himself.

Przewalski’s horses take their official name from Russian explorer Nikolai Przewalski, who found a skull and hide of one and shared it with a Russian museum.

At one time they ranged throughout Europe and Asia, according to the Smithsonian’s National Zoo and Biology Conservation Institute. Encroaching human population and livestock eventually pushed them out of Europe and east to parts of Asia like the Gobi Desert. Outside of zoos, they exist today only in reintroduction sites in Mongolia, China, and Kazakhstan.

According to the Smithsonian, they are the only true wild horses left in the world. The institute maintains wild horse herds in North America and Australia don’t count because they are the ancestors of escaped domesticated horses.

Copyright 2020 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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