Stepwise emergence of azole, echinocandin and amphotericin B multidrug resistance in vivo in Candida albicans orchestrated by multiple genetic alterations

Rasmus Hare Jensen, Karen Marie Thyssen Astvad, Luis Vale Silva, Dominique Sanglard, Rene Jørgensen, Kristian Fog Nielsen, Estella Glintborg Mathiasen, Ghazalel Doroudian, David Scott Perlin, Maiken Cavling Arendrup*

*Corresponding author

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review


Objectives: The objective of this study was to characterize the underlying molecular mechanisms in consecutive clinical Candida albicans isolates from a single patient displaying stepwise-acquired multidrug resistance. Methods: Nine clinical isolates (P-1 to P-9) were susceptibility tested by EUCAST EDef 7.2 and Etest. P-4, P-5, P-7, P-8 and P-9 were available for further studies. Relatedness was evaluated by MLST. Additional genes were analysed by sequencing (including FKS1, ERG11, ERG2 and TAC1) and gene expression by quantitative PCR (CDR1, CDR2 and ERG11). UV-spectrophotometry and GC-MS were used for sterol analyses. In vivo virulence was determined in the insect model Galleria mellonella and evaluated by log-rank Mantel-Cox tests. Results: P-1+P-2 were susceptible, P-3+P-4 fluconazole resistant, P-5 pan-azole resistant, P-6+P-7 pan-azole and echinocandin resistant and P-8+P-9 MDR. MLST supported genetic relatedness among clinical isolates. P-4 harboured four changes in Erg11 (E266D, G307S, G450E and V488I), increased expression of ERG11 and CDR2 and a change in Tac1 (R688Q). P-5, P-7, P-8 and P-9 had an additional change in Erg11 (A61E), increased expression of CDR1, CDR2 and ERG11 (except for P-7) and a different amino acid change in Tac1 (R673L). Echinocandin-resistant isolates harboured the Fks1 S645P alteration. Polyene-resistant P-8+P-9 lacked ergosterol and harboured a frameshift mutation in ERG2 (F105SfsX23). Virulence was attenuated (but equivalent) in the clinical isolates, but higher than in the azole- and echinocandin-resistant unrelated control strain. Conclusions: C. albicans demonstrates a diverse capacity to adapt to antifungal exposure. Potentially novel resistance-inducing mutations in TAC1, ERG11 and ERG2 require independent validation.

TidsskriftJournal of Antimicrobial Chemotherapy
Udgave nummer9
Sider (fra-til)2551-2555
Antal sider5
StatusUdgivet - sep. 2015
Udgivet eksterntJa

Bibliografisk note

Funding Information:
This work was supported by Gilead (Research Grant IX-DK-131-0286) and a Research Grant (2013) from the European Society of Clinical Microbiology and Infectious Diseases (ESCMID) to R. H. J.

Publisher Copyright:
© The Author 2015.

Citer dette