We screened 685 subjects from Southern Italy for a promoter polymorphism of
the UDP-glucuronosyltransferase (UGTA1) gene tightly linked to Gilbert's s
yndrome (CS), consisting in the insertion of a TA repeat in the TATA box. T
he frequency of the polymorphism was 0.387 which is similar to the frequenc
ies reported for other investigated populations of different ethnic backgro
unds and is consistent with the antiquity of this polymorphism.