The Hog1 positive regulated YCT1 gene expression under cadmium tolerance of budding yeast.

Cadmium (Cd) is a heavy metal that is the cause of irreversible hazards to living organisms. Cadmium ions can induce the phosphorylation of MAPKs pathway molecules such as Hog1 and Slt2, but downstream effectors and potential activation pathways are still unclear. In this study, the RNA-seq data analysis in Cd-stressed yeast was performed to predict and screen the signal transduction pathway and the potential effect molecules regulated by MAPKs. Based on differentially expressed genes and Venn diagrams, 31 genes regulated by Hog1p and two genes induced by Slt2p, which related to carbohydrate metabolism, oxidative damage, DNA replication stress and detoxification, were characterized under Cd exposure to yeast. A cysteine-specific transporter (Yct1) modulated by Hog1 was confirmed via RNA-seq results. Meanwhile, we tested the Cd-sensitivity, intracellular Cd concentrations and β-galactosidase assay, and results indicated that the hypersensitivity of the hog1 mutant to Cd was partly abrogated in YCT1 gene deletion, induction of YCT1 was dependent on Hog1 and its transcription factors, and Yct1p would be epistatic to the Hog1p in Cd-tolerance. The investigation of the transcriptome of MAPKs under Cd stress provided valuable information for future molecular studies of Cd-tolerance.

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