MTAP (Methylthioadenosine Phosphorylase): MTAP is an enzyme involved in the methionine salvage pathway, recycling methylthioadenosine generated during polyamine synthesis. It plays a key role in nucleotide and polyamine metabolism, supporting cell growth and differentiation. Loss of MTAP is common in several cancers and is linked to poor prognosis, making it a potential therapeutic target due to its importance in metabolic pathways essential for cell survival.