CTP:phosphocholine cytidylyltransferase is the rate-controlling enzyme in phosphatidylcholine biosynthesis and is essential for the survival of eukaryotic cells. The murine cDNA for the cytidylyltransferase was cloned and sequenced. A genomic clone was isolated and the chromosomal location of the Ctpct locus determined by Southern blot hybridization of DNAs from a panel of interspecific backcross progeny derived from matings of [(C57BL/6J × Mus spretus)F1 × C57BL/6J] mice. These data place the Ctpct gene on mouse chromosome 16 between the Smst and Stf-1 genes.
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