Case report identifies new putative DMD variant in a cat
Bottom line
A new case report in Animals describes an adult male cat with X-linked dystrophin-deficient muscular dystrophy linked to a newly reported, putatively pathogenic variant in the DMD gene. The cat presented with chronic tongue protrusion, dysphagia, marked muscle hypertrophy, persistently high creatine kinase activity, and a history of anesthesia-associated rhabdomyolysis. Muscle biopsy showed a dystrophic phenotype, immunofluorescence found absent dystrophin protein, and whole-genome sequencing identified a novel missense DMD variant, c.2207T>C (p.Gln736Arg), that the authors considered the most likely cause of disease. The report adds to a very small but growing list of genetically characterized feline dystrophinopathies. (mdpi.com)
Why it matters: For veterinary professionals, the case is a reminder that feline muscular dystrophy can show up as chronic dysphagia, tongue protrusion, generalized or regional muscle hypertrophy, and markedly increased CK, rather than as simple weakness alone. It also reinforces the practical diagnostic value of combining histopathology, dystrophin staining, and genomic testing in cats with suspected inherited myopathies, especially because anesthesia and invasive procedures may carry added risk in affected patients with a history of rhabdomyolysis. Prior feline reports have identified promoter deletions, nonsense variants, and a Becker-type missense variant in DMD, so this latest case further expands the known molecular spectrum and may help clinicians and pathologists interpret future atypical presentations. (mdpi.com)
What to watch: Whether this variant is confirmed in additional cats, incorporated into feline variant databases, or eventually supports broader diagnostic panels for inherited feline myopathies. (mdpi.com)
A case report published on April 21, 2026, in Animals adds a new entry to the short list of genetically characterized feline dystrophinopathies: an adult male cat with X-linked muscular dystrophy and a putative DMD missense variant. The cat’s clinical picture included chronic tongue protrusion, dysphagia, muscle hypertrophy, markedly increased CK activity, and prior rhabdomyolysis associated with anesthesia, with follow-up pathology and molecular testing supporting dystrophin-deficient muscular dystrophy. (mdpi.com)
That matters because feline dystrophin-deficient muscular dystrophy is uncommon, but it isn’t entirely new. Earlier reports described domestic shorthair cats with large DMD deletions, and more recent work has identified additional feline DMD variants, including a nonsense variant in a Maine Coon line, a separate nonsense variant in another cat, and a Becker-type missense variant associated with a milder course. OMIA now lists multiple feline Duchenne-type DMD variants, underscoring that the condition is genetically heterogeneous even if it remains rare in practice. (omia.org)
In the new report, the diagnostic case was built from several layers rather than sequencing alone. According to the journal abstract, clinical pathology showed markedly increased CK activity, muscle histopathology was consistent with a dystrophic phenotype, and immunofluorescent staining demonstrated absence of dystrophin protein. Whole-genome sequencing then identified two candidate variants, with the authors concluding that the novel DMD missense change, c.2207T>C (p.Gln736Arg), best explained the phenotype. That combination of clinical signs, tissue-level confirmation, and genomic analysis is important in a disease category where single-case reports can otherwise leave uncertainty about causality. (mdpi.com)
The broader research context also points to why investigators keep paying attention to these cats. Prior feline DMD papers have emphasized that molecular confirmation can improve diagnosis, help avoid unnecessary diagnostic drift, and may reduce risk when clinicians are considering procedures such as muscle biopsy under general anesthesia in cats vulnerable to rhabdomyolysis. Researchers have also noted that naturally occurring feline and canine dystrophinopathies can serve as translational models for human Duchenne and Becker muscular dystrophy, particularly as mutation-specific therapies, exon-skipping approaches, and gene therapy continue to evolve in human medicine. (pmc.ncbi.nlm.nih.gov)
There doesn’t appear to be broad outside commentary on this specific April 2026 case yet, which isn’t unusual for a single feline case report. Still, the authorship itself brings relevant expertise: G. Diane Shelton has long been associated with veterinary neuromuscular pathology, and the paper also connects to the 99 Lives precision-medicine ecosystem that has helped expand feline variant discovery. Funding and related support cited in recent feline DMD work include EveryCat Health Foundation and the 99 Lives Project, reflecting the way rare feline genetic disorders are increasingly being worked up through collaborative sequencing networks rather than isolated pathology alone. (mdpi.com)
Why it matters: For practicing veterinarians, the practical lesson is diagnostic recognition. Cats with dystrophin-deficient muscular dystrophy may present with hypertrophy, dysphagia, abnormal tongue carriage, and high CK, which can push differentials toward inflammatory, metabolic, or structural disease if inherited myopathy isn’t considered early. The anesthesia-associated rhabdomyolysis history in this case is especially relevant for clinicians planning sedation, biopsy, advanced imaging, or dental procedures in cats with unexplained myopathic signs. As feline genomic medicine becomes more accessible, pairing phenotype, biopsy findings, dystrophin staining, and targeted or whole-genome testing may become a more realistic pathway in referral settings. (mdpi.com)
The report also expands the known allelic spectrum of feline DMD disease. Earlier feline cases included gross deletions and nonsense variants that more cleanly fit Duchenne-type loss-of-function patterns, while a previously reported missense variant was associated with Becker-type disease. A new putative missense variant tied to absent dystrophin staining and a clinically significant phenotype suggests there may be more genotype-phenotype variation in cats than the sparse literature has captured so far. That could have downstream implications for prognosis, counseling of pet parents, and eventually for how feline genetic testing panels are curated. (mdpi.com)
What to watch: The next step is replication, whether through additional case reports, functional work that strengthens pathogenicity evidence for this specific variant, or inclusion in curated feline disease-variant resources such as OMIA and precision-medicine databases tied to the 99 Lives project. (omia.org)