Genomic, Transcriptomic And Physiological Analyses Of Silver-Resistantsaccharomyces Cerevisiaeobtained By Evolutionary Engineering
YEAST(2020)
Abstract
Silver is a non-essential metal used in medical applications as an antimicrobial agent, but it is also toxic for biological systems. To investigate the molecular basis of silver resistance in yeast, we employed evolutionary engineering using successive batch cultures at gradually increased silver stress levels up to 0.25-mM AgNO(3)in 29 populations and obtained highly silver-resistant and genetically stableSaccharomyces cerevisiaestrains. Cross-resistance analysis results indicated that the silver-resistant mutants also gained resistance against copper and oxidative stress. Growth physiological analysis results revealed that the highly silver-resistant evolved strain 2E was not significantly inhibited by silver stress, unlike the reference strain. Genomic and transcriptomic analysis results revealed that there were mutations and/or significant changes in the expression levels of the genes involved in cell wall integrity, cellular respiration, oxidative metabolism, copper homeostasis, endocytosis and vesicular transport activities. Particularly the missense mutation in theRLM1gene encoding a transcription factor involved in the maintenance of cell wall integrity and with 707 potential gene targets might have a key role in the high silver resistance of 2E, along with its improved cell wall integrity, as confirmed by the lyticase sensitivity assay results. In conclusion, the comparative physiological, transcriptomic and genomic analysis results of the silver-resistantS. cerevisiaestrain revealed potential key factors that will help understand the complex molecular mechanisms of silver resistance in yeast.
MoreTranslated text
Key words
adaptive laboratory evolution,evolutionary engineering,Saccharomyces cerevisiae,silver resistance,stress resistance,whole-genome sequencing
AI Read Science
Must-Reading Tree
Example
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined