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Genetic factors are implicated in pathogenesis of neonatal hyperbilirubinemia. In this nested case-control study, we determined 1) frequency of thymine-adenine (TA)n promoter polymorphism and Gly71Arg mutation in uridine diphosphoglucuronate-glucuronosyltransferase 1A1 (UGT1A1) gene in neonates &gt; or =35-wk gestation presenting with bilirubin levels &gt; or =18 mg/dL and controls, 2) interaction among (TA)n promoter polymorphism, glucose-6-phosphate dehydrogenase (G6PD) gene mutations, and peak bilirubin. The number of TA repeats was assessed by PCR-single-strand conformation polymorphism (SSCP) analysis and Gly71Arg mutation by PCR-RFLP. Fifty samples of both mutations were verified with DNA sequencing. One hundred twenty-seven neonates were enrolled (77 hyperbilirubinemics, 50 controls). The incidence of (TA)n polymorphism was higher in babies with hyperbilirubinemia [89.6% vs. 50%, OR 8.63 (95% CI, 3.2-24.1)]. Gly71Arg mutation was not found either in hyperbilirubinemics or controls. A novel polymorphism (Ala72Pro) at codon position 72 of exon 1 was detected in all 50 samples (21 hyperbilirubinemics, 29 controls), which were sequenced. Presence of variant (TA)n promoter (adjusted OR, 10.6; 95% CI, 3.3-34.2), G6PD deficiency (adjusted OR, 20.6; 95% CI, 3.6-117.3), and history of jaundice in sibling requiring phototherapy (adjusted OR, 12.6; 95% CI, 1.1-141.6) were independent risk factors for bilirubin levels &gt; or =18 mg/dL.

UGT1A1 Gene Polymorphisms in North Indian Neonates Presenting with Unconjugated Hyperbilirubinemia