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