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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallGary and Shaggy, domestic cat littermates, are the first cats reported with a molecularly characterized case of Marfan syndrome. Veterinarians suspected the rare connective tissue disorder after finding unusually long limbs, displaced lenses in both eyes, and dilation of the aortic root; genetic and RNA analyses then identified a shared FBN1 variant associated with the cats’ signs.
What diagnosis did Gary and Shaggy receive?
The cats were diagnosed with Marfan syndrome, a connective tissue disorder. Cornell University College of Veterinary Medicine described them as the first reported cats whose case was molecularly characterized. The study was published in Scientific Reports on September 19, 2026; Cornell announced the finding on September 22, 2026. Cornell’s report and the published study describe a case involving two littermates, not evidence that the condition is widespread in cats.
How did veterinarians identify the condition?
Clinical signs raised suspicion
Unusually long limbs were an early clue. Examinations also found bilateral lens luxation, meaning the lenses in both eyes had moved out of their normal positions, and dilation of the aortic root, the beginning of the main artery leaving the heart. Together, these findings prompted veterinarians to consider Marfan syndrome. Appearance alone would not establish the diagnosis.
Genetic and RNA results supported it
Whole-genome sequencing found the same homozygous splice-region variant in both cats: FBN1 XM_023255387.2:c.2678-3C>A. FBN1 encodes fibrillin-1, a structural protein important to connective tissue. In an affected cat, RNA sequencing found that exon 22 was skipped in 73% of transcripts. The variant disrupted normal splicing, but did not stop it entirely: some normally spliced transcript remained.
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Although both copies of the gene carried the variant, the researchers describe the cats as functionally heterozygous because some normal transcript was still produced. That distinction helps explain why the molecular result was not simply an all-or-nothing loss of normal gene activity.
What does this finding establish—and what does it not?
- It establishes a documented feline case: the report combines clinical findings with molecular evidence in two cats.
- It does not establish how common Marfan syndrome is in cats: a two-cat case report cannot provide a feline prevalence estimate.
- The human figure is not a cat statistic: Cornell says Marfan syndrome affects about 1 in 4,000 people. That estimate applies to people and should not be transferred to cats.
- It does not establish a standard feline diagnostic protocol or treatment plan: the cited report documents these cats’ evaluation, not a general care guideline.
- It does not announce an available feline genetic test: Cornell says the finding may help veterinarians recognize similar cases and could support diagnostic development in the future.
Senior author Dr. Jacquelyn Evans, assistant professor in Cornell’s Department of Biomedical and Translational Sciences and at the Baker Institute for Animal Health, said the findings “may help veterinarians recognize similar cases in the future.”
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What should cat owners take away?
Long limbs by themselves do not mean a cat has Marfan syndrome. Gary and Shaggy’s diagnosis rested on a combination of examination findings and molecular analysis. If a cat has unusual physical features or a veterinary concern involving the eyes or heart, an owner should discuss those observations with a veterinarian rather than infer a diagnosis from appearance or assume that a feline test is routinely available.
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