Cornell scientists identify rare human genetic disorder in two unusually long-legged cats
Date:
October 14, 2026
Source:
Cornell University
Summary:
Two unusually long-legged cats have helped scientists uncover the first genetically confirmed cases of Marfan syndrome in domestic felines. Researchers at Cornell University discovered that the brothers carried two altered copies of a gene linked to the rare connective tissue disorder, which can affect the eyes, heart, and blood vessels. Surprisingly, the cats survived into adulthood because their genetic mutation still allowed some normal function.
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Two brothers named Gary and Shaggy have helped Cornell University researchers make a rare genetic discovery. In a study published in Scientific Reports, scientists reported the first molecular characterization of Marfan syndrome in domestic cats, a condition primarily recognized in humans.
Gary and Shaggy first stood out as kittens because of their unusually long limbs. As they grew older, veterinarians also identified abnormalities in their eye structures and an enlarged aorta, the body’s main artery. Together, these symptoms suggested Marfan syndrome, an inherited condition that weakens connective tissues throughout the body. The disorder affects approximately 1 in 4,000 people, but these brothers represented the first known documented feline cases.
The findings provide a foundation for improved veterinary
“The findings provide a foundation for improved veterinary diagnostics,” said senior author Dr. Jacquelyn Evans, assistant professor in the College of Veterinary Medicine and at the Baker Institute for Animal Health. “It can help veterinarians recognize similar cases in the future and may help develop genetic tests.”
Scientists Uncover a Surprising Genetic Twist
To determine what caused the brothers’ unusual symptoms, researchers from multiple disciplines conducted thorough medical examinations and analyzed their DNA. Their investigation identified changes in a gene called FBN1, which provides instructions for producing fibrillin-1. This protein is essential for healthy connective tissue, helping support structures throughout the body, including blood vessels, bones, ligaments, skin, and eyes.
Genetic testing revealed that Gary and Shaggy each had two altered copies of FBN1, having inherited one from each parent. This was especially notable because, in humans, a mutation in just one copy of the gene can be enough to cause Marfan syndrome. Having two altered copies is exceptionally uncommon and can severely disrupt the production of normal fibrillin-1.
Yet the brothers’ genetic changes had an unexpected
Yet the brothers’ genetic changes had an unexpected effect. Further analysis showed that their particular variant did not completely disable the gene. Instead, it interfered with how the gene’s instructions were processed while still allowing some normal activity to continue. That remaining function helps explain why Gary and Shaggy were able to survive into adulthood, even though carrying two copies of such a mutation could otherwise have resulted in a much more severe form of the disorder.
Materials provided by Cornell University. Original Note: Content may be edited for style and length
- Shawna R. Cook, Jessica J. Hayward, Soon Hon Cheong, Linda Impe, Ian R. Porter, Brian Lamendola, Gavin R. Hitchener, Urs Giger, Philip R. Fox, Jacquelyn M. Evans, Bart J. G. Broeckx. A homozygous hypomorphic FBN1 splice region variant in domestic cats with Marfan syndrome. Scientific Reports, 2026; DOI: 10.1038/s41598-026-70702-3
Cornell University. “Cornell scientists identify rare human genetic disorder in two unusually long-legged cats.” ScienceDaily. ScienceDaily, 14 October 2026. <www.sciencedaily.com/releases/2026/10/261013015801.htm>.
Cornell University. (2026, October 14). Cornell scientists identify rare human genetic disorder in two unusually long-legged cats. ScienceDaily. Retrieved October 14, 2026 from www.sciencedaily.com/releases/2026/10/261013015801.htm
Cornell University. “Cornell scientists identify rare human genetic disorder in two unusually long-legged cats.” ScienceDaily. www.sciencedaily.com/releases/2026/10/261013015801.htm (accessed October 14, 2026).
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