Researchers at Cornell University have identified the first known cases of Marfan syndrome in cats, originating from two brothers with unusually long legs. Gary and Shaggy, as kittens, exhibited notably elongated limbs, prompting a series of examinations including eye tests and imaging that revealed structural abnormalities and an enlarged aorta. This led veterinarians to suspect Marfan syndrome, a rare inherited disorder primarily known for affecting humans.
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Marfan syndrome impacts approximately 1 in 4,000 individuals and weakens the connective tissue throughout the body, affecting blood vessels, ligaments, and ocular structures. The findings regarding Gary and Shaggy were published in the September 19 issue of Scientific Reports, providing a unique opportunity for researchers at Cornell's College of Veterinary Medicine and Baker Institute for Animal Health to explore this syndrome in cats.
The study involved collaboration between clinicians and geneticists from Cornell, Ghent University in Belgium, the University of Pennsylvania, and the Schwarzman Animal Medical Center in New York City. Through detailed clinical assessments and genetic sequencing, the research team identified FBN1, the gene responsible for producing fibrillin-1, a crucial connective tissue protein, as the source of the condition.
Notably, while humans typically require just one altered copy of FBN1 to develop Marfan syndrome, both Gary and Shaggy inherited two affected copies, which is rare and usually leads to a severe impairment of normal fibrillin-1 production. However, the researchers discovered that the specific mutation in the brothers partially disrupted gene function, allowing them to reach adulthood despite the presence of the double variant.
Dr. Jacquelyn Evans, a senior author on the study, noted the potential impact of these findings in helping veterinarians recognize similar cases in the future. She emphasized the collaborative effort involved, from the observation by pet owners to the interdisciplinary work that led to identifying the specific mutation.
This case also highlights the importance of considering connective tissue disorders across species. When multiple skeletal, ocular, and cardiovascular issues appear in a single patient, it suggests a broader differential diagnosis approach may be necessary. The advancements in genetic sequencing previously restricted to human medicine are becoming increasingly applicable in veterinary cases, as demonstrated by Gary and Shaggy's situation.
Source: Cornell University College of Veterinary Medicine and the Baker Institute for Animal Health. Report originally by Teresa Griffin.