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P. Yadav, R. Rajasekharan (2018)
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The precise and controlled regulation of gene expression at transcriptional and post-transcriptional levels is crucial for the eukaryotic cell survival and functions. In eukaryotes, more than 100 types of post-transcriptional RNA modifications have been identified. The N6-methyladenosine (m6A) modification in mRNA is among the most common post-transcriptional RNA modifications known in eukaryotic organisms, and the m6A RNA modification can regulate gene expression. The role of yeast m6A methyltransferase (Ime4) in meiosis, sporulation, triacylglycerol metabolism, vacuolar morphology, and mitochondrial functions has been reported. Stress triggers triacylglycerol accumulation as lipid droplets. Lipid droplets are physically connected to the different organelles such as endoplasmic reticulum, mitochondria, and peroxisomes. However, the physiological relevance of these physical interactions remains poorly understood. In yeast, peroxisome is the sole site of fatty acid β-oxidation. The metabolic status of the cell readily governs the number and physiological function of peroxisomes. Under low-glucose or stationary-phase conditions, peroxisome biogenesis and proliferation increase in the cells. Therefore, we hypothesized a possible role of Ime4 in the peroxisomal functions. There is no report on the role of Ime4 in peroxisomal biology. Here, we report that IME4 gene deletion causes peroxisomal dysfunction under stationary-phase conditions in Saccharomyces cerevisiae; besides, the ime4Δ cells showed a significant decrease in the expression of the key genes involved in peroxisomal β-oxidation compared to the wild-type cells. Therefore, identification and determination of the target genes of Ime4 that are directly involved in the peroxisomal biogenesis, morphology, and functions will pave the way to better understand the role of m6A methylation in peroxisomal biology.
Current Genetics – Springer Journals
Published: Oct 17, 2017
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