GDPD5 (Glycerophosphodiester Phosphodiesterase Domain Containing 5) is a gene involved in lipid metabolism, particularly in breaking down glycerophosphodiesters into glycerol phosphate and alcohol. This activity supports membrane component turnover and regulates intracellular signalling. GDPD5 plays a role in lipid signalling pathways, with potential implications for metabolic and cardiovascular health.