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• W4297099914 abstract "ABSTRACT Acetyl-CoA is a central metabolite used for lipid synthesis in the cytosol and histone acetylation in the nucleus, among other pathways. The two major precursors to acetyl-CoA in the nuclear-cytoplasmic compartment are citrate and acetate, which are processed to acetyl-CoA by ATP-citrate lyase (ACLY) and acyl-CoA synthetase short-chain 2 (ACSS2), respectively. While some evidence has suggested the existence of additional routes to nuclear-cytosolic acetyl-CoA, such pathways remain poorly defined. To investigate this, we generated cancer cell lines lacking both ACLY and ACSS2. Unexpectedly, and in contrast to observations in fibroblasts, ACLY and ACSS2 double knockout (DKO) cancer cells remain viable and proliferate, maintain pools of cytosolic acetyl-CoA, and are competent to acetylate proteins in both cytosolic and nuclear compartments. Using stable isotope tracing, we show that both glucose and fatty acids feed acetyl-CoA pools and histone acetylation in DKO cells. Moreover, we provide evidence for the carnitine shuttle and carnitine acetyltransferase (CrAT) as a substantial pathway to transfer two-carbon units from mitochondria to cytosol independent of ACLY. Indeed, in the absence of ACLY, glucose can feed fatty acid synthesis in a carnitine responsive and CrAT-dependent manner. This work defines a carnitine-facilitated route to produce nuclear-cytosolic acetyl-CoA, shedding light on the intricate regulation and compartmentalization of acetyl-CoA metabolism" @default.
• W4297099914 created "2022-09-27" @default.
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• W4297099914 date "2022-09-26" @default.
• W4297099914 modified "2023-10-14" @default.
• W4297099914 title "The carnitine shuttle links mitochondrial metabolism to histone acetylation and lipogenesis" @default.
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• W4297099914 doi "https://doi.org/10.1101/2022.09.24.509197" @default.
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