GPD1 (Glycerol-3-Phosphate Dehydrogenase 1) is a Protein Coding gene. 2 alternatively spliced human isoforms have been reported. GPD1 is a member of the NAD-dependent glycerol-3-phosphate dehydrogenase family. The encoded protein plays a critical role in carbohydrate and lipid metabolism by catalyzing the reversible conversion of dihydroxyacetone phosphate (DHAP) and reduced nicotine adenine dinucleotide (NADH) to glycerol-3-phosphate (G3P) and NAD+. It also reduces nicotine adenine dinucleotide (NADH) to glycerol-3-phosphate (G3P) and NAD+. Meanwhile, GPD1 and mitochondrial glycerol-3-phosphate dehydrogenase also form a glycerol phosphate shuttle that facilitates the transfer of reducing equivalents from the cytosol to mitochondria. Diseases associated with GPD1 include Hypertriglyceridemia, Transient Infantile, and Myopathy, Distal, 1.