NMRK1 (Nicotinamide Riboside Kinase 1): NMRK1 is an enzyme that plays a crucial role in the NAD+ biosynthesis pathway by catalyzing the conversion of nicotinamide riboside to nicotinamide mononucleotide. NAD+ is vital for energy metabolism, DNA repair, and cellular signalling. Through its function in NAD+ production, NMRK1 is essential for maintaining cellular energy balance and genomic stability, with implications for ageing, metabolic disorders, and conditions associated with NAD+ depletion.