drug resistance evolution
Research Article | Ecological and Evolutionary ScienceParallel Evolution of Tobramycin Resistance across Species and EnvironmentsThe rise of antimicrobial resistance is a leading medical threat, motivating efforts to forecast both its evolutionary dynamics and its genetic causes. Aminoglycosides are a major class of antibiotics that disrupt translation, but resistance may occur by a number of mechanisms. Here, we show the repeated evolution of resistance to the aminoglycoside tobramycin in both P....
Research Article | Therapeutics and PreventionPlasmodium falciparum Resistance to a Lead Benzoxaborole Due to Blocked Compound Activation and Altered Ubiquitination or SumoylationBenzoxaboroles are under study as potential new drugs to treat malaria. One benzoxaborole, AN13762, has potent activity and promising features, but its mechanisms of action and resistance are unknown. To gain insights into these mechanisms, we cultured malaria parasites with nonlethal concentrations of AN13762 and generated parasites with varied levels of resistance. Parasites with low-level resistance had mutations in PfPARE, which...
Research Article | Ecological and Evolutionary ScienceA New Lineage of Cryptococcus gattii (VGV) Discovered in the Central Zambezian Miombo WoodlandsCryptococcus gattii is an environmental pathogen that causes severe systemic infection in immunocompetent individuals more often than in immunocompromised humans. Over the past 2 decades, researchers have shown that C. gattii falls within four genetically distinct major lineages. By combining field...
Research Article | Ecological and Evolutionary ScienceGlobal Spread of Mutant PfCRT and Its Pleiotropic Impact on Plasmodium falciparum Multidrug Resistance and FitnessOur study defines the allelic distribution of pfcrt, an important mediator of multidrug resistance in Plasmodium falciparum, in Africa and Asia. We leveraged whole-genome sequence analysis and gene editing to demonstrate how current drug combinations can select different allelic variants of this gene and shape region-specific parasite population structures....
Research Article | Molecular Biology and PhysiologyEvolution of Fluconazole-Resistant Candida albicans Strains by Drug-Induced Mating Competence and Parasexual RecombinationSexual reproduction is an important mechanism in the evolution of species, since it allows the combination of advantageous traits of individual members in a population. The pathogenic yeast Candida albicans is a diploid organism that normally propagates in a clonal fashion, because heterozygosity at the mating type locus (MTL) inhibits mating between cells....
- Research ArticleThe Birth and Demise of the ISApl1-mcr-1-ISApl1 Composite Transposon: the Vehicle for Transferable Colistin Resistance
A comprehensive analysis of all intact mcr-1 sequences in GenBank was used to identify a region on the chromosome of a novel Moraxella species with remarkable homology to the canonical mcr-1 structure and that likely represents the origin of this important gene. These data also demonstrate that all mcr-1 structures lacking one or both flanking ISApl1 were formed from ancestral composite...