An enzyme that catalyzes the synthesis of UDPgalactose from UTP and galactose-1-phosphate. It is present in low levels in fetal and infant liver, but increases with age, thereby enabling galactosemic infants who survive to develop the capacity to metabolize galactose. EC 2.7.7.10.

Synonyms: UTP-Hexose-1-Phosphate Uridylyltransferase Galactosephosphate Uridylyltransferase Uridylyltransferase, Galactosephosphate Galactose 1 Phosphate Uridyltransferase UTP:alpha-D-hexose-1-phosphate uridylyltransferase EC 2.7.7.10 Pyrophosphorylase, UDP Galactose Uridylyltransferase, UTP-Hexose-1-Phosphate UTP Hexose 1 Phosphate Uridylyltransferase Galactose Pyrophosphorylase, UDP Galactose-1-Phosphate Uridyltransferase Uridyltransferase, Galactose-1-Phosphate UDP Galactose Pyrophosphorylase