The function of ENSG00000161217 (PCYT1A, phosphate cytidylyltransferase 1A, choline) is as follows. Catalyzes the key rate-limiting step in the CDP-choline pathway for phosphatidylcholine biosynthesis. {ECO:0000269|PubMed:10480912, ECO:0000269|PubMed:30559292, ECO:0000269|PubMed:7918629}.