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• W2496574811 abstract "Abstract The majority of low-grade and secondary high-grade gliomas carry heterozygous hotspot mutations in cytosolic isocitrate dehydrogenase 1 ( IDH1 ) or the mitochondrial variant IDH2 . These mutations mostly involve Arg132 in IDH1 and Arg172 or Arg140 in IDH2. Whereas IDHs convert isocitrate to alpha-ketoglutarate (α-KG) with simultaneous reduction of NADP + to NADPH, these IDH mutants reduce α-KG to D-2-hydroxyglutarate (D-2-HG) while oxidizing NADPH. D-2-HG is a proposed oncometabolite, acting via competitive inhibition of α-KG-dependent enzymes that are involved in metabolism and epigenetic regulation. However, much less is known about the implications of the metabolic stress, imposed by decreased α-KG and NADPH production, for tumor biology. We here present a novel heterozygous IDH1 mutation, IDH1 R314C , which was identified by targeted next generation sequencing of a high grade glioma from which a mouse xenograft model and a cell line were generated. IDH1 R314C lacks isocitrate-to-α-KG conversion activity due to reduced affinity for NADP + and differs from the IDH1 R132 mutants in that it does not produce D-2-HG. Because IDH1 R314C is defective in producing α-KG and NADPH, without concomitant production of the D-2-HG, it represents a valuable tool to study the effects of IDH1-dysfunction on cellular metabolism in the absence of this oncometabolite." @default.
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• W2496574811 date "2016-07-27" @default.
• W2496574811 modified "2023-09-27" @default.
• W2496574811 title "Identification of a novel inactivating mutation in Isocitrate Dehydrogenase 1 (IDH1-R314C) in a high grade astrocytoma" @default.
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• W2496574811 doi "https://doi.org/10.1038/srep30486" @default.
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