Researchers corrected the mislabeled rttA gene in the dangerous fungus Aspergillus fumigatus and discovered it acts as a master control switch for sterol production and antifungal drug resistance. When this gene is active, it helps fungi survive azole medications by boosting production of ergosterol, a critical component of fungal cell membranes. This discovery reveals how fungi develop resistance to our frontline antifungal treatments and suggests new ways to combat these life-threatening infections.