LC3A (Microtubule-associated protein light chain 3A) belongs to LC3/GABARAP autophagy-protein family. Cytosolic soluble LC3A-I undergoes lipidation to produce LC3A-II, which stably inserts into autophagosomal membranes. LC3A drives autophagosome biogenesis and elongation and represents a bona-fide autophagosome marker. Autophagy induction leads to LC3A-II accumulation, while functional autophagic flux mediates LC3A-II turnover in lysosomes.