The first litter of puppies born by in vitro fertilization shows promise for conserving endangered canid species, say researchers.
The breakthrough, described in the journal PLOS ONE, also opens the door to using gene-editing technologies to eradicate heritable diseases in dogs and for study of genetic diseases. Canines share more than 350 similar heritable disorders and traits with humans, almost twice the number as any other species.
Scientists transferred 19 embryos to the host female dog, who gave birth to seven healthy puppies, two from a beagle mother and a cocker spaniel father, and five from two pairings of beagle fathers and mothers.
“Since the mid-1970s, people have been trying to do this in a dog and have been unsuccessful,” says Alex Travis, associate professor of reproductive biology in the Baker Institute for Animal Health in Cornell University’s College of Veterinary Medicine.
RARE BREEDS AND SPECIES
The findings have wide implications for wildlife conservation because, Travis says, “We can freeze and bank sperm, and use it for artificial insemination. We can also freeze oocytes, but in the absence of in vitro fertilization, we couldn’t use them. Now we can use this technique to conserve the genetics of endangered species.”
In vitro fertilization allows conservationists to store semen and eggs and bring their genes back into the gene pool in captive populations. In addition to endangered species, this can also be used to preserve rare breeds of show and working dogs.
With new genome editing techniques, researchers may one day remove genetic diseases and traits in an embryo, ridding dogs of heritable diseases. While selecting for desired traits, inbreeding has also led to detrimental genetic baggage. Different breeds are predisposed to different diseases; golden retrievers are likely to develop lymphoma, while Dalmatians carry a gene that predisposes them to blockage with urinary stones.
“With a combination of gene editing techniques and IVF, we can potentially prevent genetic disease before it starts,” Travis says.
Finally, since dogs and humans share so many diseases, dogs now offer a “powerful tool for understanding the genetic basis of diseases,” Travis says.
For successful in vitro fertilization, researchers must fertilize a mature egg with a sperm in a lab to produce an embryo. They must then insert the embryo into a host female at the right time in her reproductive cycle.
The first challenge was to collect mature eggs from the female oviduct. The researchers first tried to use eggs that were in the same stage of cell maturation as other animals, but since dogs’ reproductive cycles differ from other mammals, those eggs failed to fertilize. Through experimentation, graduate student and first author Jennifer Nagashima and colleagues found if they left the egg in the oviduct one more day, the eggs reached a stage where fertilization was greatly improved.
The second challenge was that the female tract prepares sperm for fertilization, requiring researchers to simulate those conditions in the lab. Nagashima and colleague Skylar Sylvester found that adding magnesium to the cell culture properly prepared the sperm.
“We made those two changes, and now we achieve success in fertilization rates at 80 to 90 percent,” Travis says.
The final challenge for the researchers was freezing the embryos. Travis and colleagues delivered Klondike, the first puppy born from a frozen embryo in the Western Hemisphere in 2013. Freezing the embryos allowed the researchers to insert them into the recipient’s oviducts (called fallopian tubes in humans) at the right time in her reproductive cycle, which occurs only once or twice a year.
Coauthors include Nucharin Songsasen, a research scientist at the Smithsonian Conservation Biology Institute, National Zoological Park.
The National Institutes of Health, the Baker Institute for Animal Health, Cornell’s Atkinson Center for a Sustainable Future, and the Smithsonian Institution funded the study.