Metabolism Writes the Epigenome: Metabolite-Encoded Malignancy in Oral Squamous Cell Carcinoma

Oral squamous cell carcinoma (OSCC) is increasingly recognized as a malignancy in which genetic alterations alone are insufficient to explain disease initiation and progression. Instead, coordinated interactions between cellular metabolism and epigenetic regulation have emerged as central drivers of OSCC pathogenesis. While metabolism and epigenetics were traditionally viewed as parallel processes, growing evidence indicates that metabolic intermediates directly regulate chromatin-modifying enzymes, thereby linking metabolic flux to transcriptional control. Metabolites such as acetyl-CoA, S-adenosylmethionine, α-ketoglutarate, NAD⁺, and lactate function as essential cofactors for epigenetic modifications, enabling dynamic coupling of metabolic states with chromatin architecture. OSCC provides a unique context for studying this interplay due to chronic exposure to tobacco, areca nut, alcohol, hypoxia, and inflammation within the oral microenvironment. This review integrates recent findings demonstrating how glycolytic reprogramming, mitochondrial dysfunction, altered onecarbon metabolism, and lipid-derived acetyl-CoA production drive epigenetic remodeling in OSCC. We highlight lactate-mediated signaling, disrupted α-ketoglutarate–succinate balance, and metabolite-dependent regulation of histone acetyltransferase activity at oncogenic loci. Furthermore, we introduce the concept of metabolite-encoded epigenetic memory, wherein metabolic perturbations establish heritable epigenetic states that sustain malignant transcriptional programs beyond the initiating stress. Finally, we discuss therapeutic strategies targeting the metabolic–epigenetic interface, including combinatorial epigenetic and immunotherapeutic approaches, and the potential of metabolite and chromatin signatures as biomarkers for precision medicine in OSCC.