The function of PITPNA (phosphatidylinositol transfer protein alpha, ENSG00000174238) is as follows. Catalyzes the transfer of phosphatidylinositol (PI) and phosphatidylcholine (PC) between membranes (PubMed:10531358, PubMed:14962392, PubMed:15522822, PubMed:18636990, PubMed:22822086). Shows a preference for PI and PC containing shorter saturated or monosaturated acyl chains at the sn-1 and sn-2 positions (PubMed:15522822, PubMed:22822086). Preference order for PC is C16:1 > C16:0 > C18:1 > C18:0 > C20:4 and for PI is C16:1 > C16:0 > C18:1 > C18:0 > C20:4 > C20:3 (PubMed:22822086). {ECO:0000269|PubMed:10531358, ECO:0000269|PubMed:14962392, ECO:0000269|PubMed:15522822, ECO:0000269|PubMed:18636990, ECO:0000269|PubMed:22822086}.