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Background  Drug susceptible clinical isolates of  Candida albicans  frequently become highly tolerant to drugs during chemotherapy, with dreadful consequences to patient health. We used RNA sequencing (RNA-seq) to analyze the transcriptomes of a CDR (Candida Drug Resistance) strain and its isogenic drug sensitive counterpart.    Results  RNA-seq unveiled differential expression of 228 genes including a) genes previously identified as involved in CDR, b) genes not previously associated to the CDR phenotype, and c) novel transcripts whose function as a gene is uncharacterized. In particular, we show for the first time that CDR acquisition is correlated with an overexpression of the transcription factor encoding gene  CZF1 .  CZF1  null mutants were susceptible to many drugs, independently of known multidrug resistance mechanisms. We show that  CZF1  acts as a repressor of β-glucan synthesis, thus negatively regulating cell wall integrity. Finally, our RNA-seq data allowed us to identify a new transcribed region, upstream of the  TAC1  gene, which encodes the major CDR transcriptional regulator.    Conclusion  Our results open new perspectives of the role of Czf1 and of our understanding of the transcriptional and post-transcriptional mechanisms that lead to the acquisition of drug resistance in  C. albicans , with potential for future improvements of therapeutic strategies.

RNA sequencing revealed novel actors of the acquisition of drug resistance in Candida albicans