The function of PITPNC1 (phosphatidylinositol transfer protein cytoplasmic 1, ENSG00000154217) is as follows. [Isoform 1]: Catalyzes the transfer of phosphatidylinositol (PI) and phosphatidic acid (PA) between membranes (PubMed:10531358, PubMed:22822086). Binds PA derived from the phospholipase D signaling pathway and among the cellular PA species, preferably binds to the C16:0/16:1 and C16:1/18:1 PA species (PubMed:22822086). . [Isoform 2]: Catalyzes the transfer of phosphatidylinositol between membranes. .