MTHFD2 (Methylenetetrahydrofolate Dehydrogenase 2): MTHFD2 is an enzyme that plays a crucial role in the mitochondrial one-carbon metabolic pathway. It is vital for nucleotide biosynthesis, methylation reactions, and amino acid balance. MTHFD2 is highly expressed in rapidly dividing cells, including cancer cells, where it aids the production of purines and thymidylate, essential for DNA replication and repair. Its function in cellular metabolism and proliferation highlights its significance in growth and development, and its selective expression in tumours makes it a potential therapeutic target.