ERG11 Mutations Cause Miconazole Resistance in Yeast
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- University of Illinois Urbana-Champaign isolated yeast from dogs with recurrent otitis externa, sequenced their ERG11 gene, and linked specific amino‑acid changes to reduced miconazole susceptibility.
- Researchers built a phylogenetic tree of the isolates, revealing three genetic clusters that corresponded to distinct ERG11 mutation patterns.
- Phylogenetic analysis showed that a particular amino‑acid substitution in the Erg11 protein was present in strains that failed to respond clinically to miconazole.
- Amino acid substitution made the yeast less responsive to miconazole but more vulnerable to the longer‑tailed azole posaconazole in laboratory assays.
- Authors recommend using short‑tailed azoles such as miconazole or clotrimazole as first‑line therapy, reserving medium‑ and long‑tailed agents (ketoconazole, posaconazole) for recurrent or non‑responsive cases.
- Study was published in Veterinary Dermatology and involved collaboration with the University of Otago in New Zealand to test drug‑protein interactions.
Why it matters: Veterinarians gain a clearer roadmap for selecting antifungals, reducing reliance on broad‑spectrum drugs and slowing resistance, while dogs benefit from more effective therapy. Pharmaceutical stewardship improves as clinicians reserve stronger azoles for refractory cases, curbing unnecessary drug pressure and preserving future treatment options.
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