Research from St. Petersburg State University shows that all cheetahs contain very similar genomes. Their similarities is one of the reasons that support the fact that the main cause of rapid cheetah population decline and why they persist on dying from viruses. This species had had two major population declines. The first was due to migration, however the time still remains unknown. The scholars came to the consensus that this reasoning explains why cheetah transplants almost always work, due to similar gene structure easily accepting the other's organ. Yet still, some of these genes appear to be broken, proving that they frequently die from viruses that many other feline family members would regularly survive.
http://rbth.com/science_and_tech/2015/12/10/inbreeding-threatens-cheetah-population-with-extinction_549601
http://rbth.com/science_and_tech/2015/12/10/inbreeding-threatens-cheetah-population-with-extinction_549601