Gary and Shaggy, two domestic cat siblings, are the first cats reported with molecularly characterized Marfan syndrome. Their case shows that a condition associated with the human FBN1 gene can also affect cats, but it does not show how common the condition is in felines or establish a screening test for other cats.
What researchers observed in Gary and Shaggy
The September 2026 report describes two siblings whose signs involved more than one body system. Cornell’s College of Veterinary Medicine said the cats had unusually long limbs as kittens. Later examinations identified abnormalities in structures of the eyes and enlargement of the aorta, the major artery carrying blood away from the heart. The combination led researchers to investigate Marfan syndrome, a connective-tissue disorder best known in people.
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That combination matters because it connected outwardly noticeable features with findings in the eyes and cardiovascular system. The report is a clinical and genetic account of these two cats, not a survey of feline health.
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What the FBN1 finding means
The researchers linked the cats’ condition to a homozygous hypomorphic splice-region variant in FBN1. This gene encodes fibrillin-1, a protein involved in connective tissue. “Homozygous” means Gary and Shaggy each had two copies of the altered variant; “splice-region” refers to a part of the gene involved in processing its RNA instructions.
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The variant was described as disrupting RNA processing while retaining partial function. In other words, it did not eliminate all normal activity. Cornell’s account says that remaining function is consistent with the siblings surviving into adulthood despite having two altered copies. The case does not establish how the same variant, or other FBN1 variants, would affect different cats.
How the feline finding differs from the human comparison
Both the feline report and human Marfan syndrome involve FBN1, but the inheritance details reported here should not be conflated. Cornell says one altered copy can cause Marfan syndrome in humans; Gary and Shaggy each had two copies of their particular variant.
| Comparison | What is reported |
|---|---|
| Human Marfan syndrome | Cornell’s 2026 account says one altered FBN1 copy can cause the condition. The specific feline variant is not established as typical of human cases. |
| Gary and Shaggy | Both siblings had two copies of a homozygous hypomorphic splice-region variant in FBN1. |
Cornell’s 2026 account gives an estimate of about 1 in 4,000 people with Marfan syndrome. That is a human estimate, not a measure of how many cats have the condition.
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What this case does—and does not—tell cat owners
The report establishes a notable finding in two related cats. It does not establish feline prevalence, the usual course of the condition in cats, or how likely another cat with long limbs or eye or aortic abnormalities is to have Marfan syndrome. Those signs alone should not be treated as a diagnosis.
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Nor does the report set out a standard diagnostic pathway or treatment for feline patients. A veterinarian is the appropriate person to assess an individual cat’s signs and decide whether further evaluation is needed.
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Cornell senior author Dr. Jacquelyn Evans said the findings may help veterinarians recognize similar cases and provide a foundation for improved veterinary diagnostics. Cornell also described genetic tests as a possible future application. These are potential benefits of the work, not an announcement that a feline FBN1 test is currently available or a recommendation to screen cats.
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