35kD pulmonary surfactant associated protein, 35kD pulmonary surfactant-associated protein, Alveolar proteinosis protein, COLEC4, Collectin 4, Collectin-4, FLJ50593, FLJ51913, FLJ61144, FLJ77898,, FLJ79095, FLJ99559, MGC133365, MGC198590, OTTHUMP00000019928, OTTHUMP00000019929, OTTHUMP00000019930, OTTHUMP00000019931, PSAP, PSP A, PSP-A, PSPA, pulmonary surfactant -associated protein, 35KD, pulmonary surfactant apoprotein PSP-A, pulmonary surfactant associated protein A1, Pulmonary surfactant-associated protein A1, SFTA1_HUMAN, SFTP1, SFTPA1, SFTPA1B, SP A, SP A1, SP-A, SP-A1, SPA, SPA1, surfactant protein A1, surfactant protein A1 variant AB'D' 6A2, surfactant protein A1 variant AB'D' 6A3, surfactant protein A1 variant AB'D' 6A4, surfactant protein A1 variant ACD' 6A2, surfactant protein A1 variant ACD' 6A3, surfactant protein A1 variant ACD' 6A4, surfactant protein A1 variant AD' 6A, surfactant protein A1 variant AD' 6A2, surfactant protein A1 variant AD' 6A3, surfactant protein A1 variant AD' 6A4, surfactant protein A1B, surfactant, pulmonary associated protein A1A, surfactant, pulmonary associated protein A1B, surfactant-associated protein, pulmonary 1

This gene encodes a lung surfactant protein that is a member of a subfamily of C-type lectins called collectins. The encoded protein binds specific carbohydrate moieties found on lipids and on the surface of microorganisms. This protein plays an essential role in surfactant homeostasis and in the defense against respiratory pathogens. Mutations in this gene are associated with idiopathic pulmonary fibrosis. Alternate splicing results in multiple transcript variants.