In a study involving 100 healthy Caucasians people and 50 Egyptians, researchers investigated the co-occurrence of a TATA box mutation associated with Gilbert’s syndrome (UGT1A1-28) along with other polymorphisms in the UDP-glucuronosyltransferase-1 locus (UGT1A1-6 and UGT1A1-73). Here, UGT1A1 is linked to Gilbert syndrome.