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ISSN: 2161-1041

Hereditary Genetics: Current Research
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Case Report

Case Of Severe Unconjugated Hyperbilirubinemia In A Neonate Heterozygous For Gilbert Syndrome

Rebecca Abell1*, Berrin Monteleone2 and Anupama Chawla1

1Pediatric Gastroenterology, Hepatology, and Nutrition, Stony Brook Long Island Children’s Hospital, Stony Brook, NY, USA

2Pediatric Genetic and Metabolic Diseases, Stony Brook Long Island Children’s Hospital, Stony Brook, NY, USA

*Corresponding Author:
Rebecca Abell
Pediatric Gastroenterology, Hepatology,and Nutrition
Stony Brook Long Island Children’s Hospital, Stony Brook, NY, USA
Tel: 1-631-444-8115
Fax: 1-631-444-6045
E-mail: [email protected]

Received date: March 06, 2012; Accepted date: July 26, 2012; Published date: July 28, 2012

Citation: Abell R, Monteleone B, Chawla A (2012) Case of Severe Unconjugated Hyperbilirubinemia in a Neonate Heterozygous for Gilbert Syndrome. Hereditary Genet 1:114. doi: 10.4172/2161-1041.1000114

Copyright: © 2012 Abell R, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

We present an unusual case of unconjugated hyperbilirubinemia in a 6 day old infant. The bilirubin peaked at 20.1/ 0.6 mg/dL. A work-up for a hemolytic process or metabolic disorder was negative. Crigler-Najjar was suspected. Phenobarbital was given for 3 days with no significant change in bilirubin level. He was discharged home after 20 days of phototherapy with a bilirubin of 3.1/0.4 mg/dL. Five months later, his bilirubin was 0.2 mg/dL. His genetic testing came back positive for a heterozygous mutation for Gilbert Syndrome. In the UGT1A1 gene he had the following mutations: heterozygous *28 (TA 6/7) (c. 40-39insTA), heterozygous *60 (c-3275T>G), and heterozygous *93 (c.- 3152G>A). This result is consistent with a carrier state for unconjugated hyperbilirubinemia and may be associated with mild to moderate hyperbilirubinemia. The relevance of this haplotype of polymorphisms to hyperbilirubinemia in the neonate has not been established. Gilbert syndrome is the most common hereditary cause of increased bilirubin but is typically associated with mild hyperbilirubinemia, around 3 mg/dL. In the homozygous state, diminished bilirubin glucuronidation is observed but it is questionable if the same amount of decreased activity can be seen in the heterozygous state. It has been proposed that when additional mutations exist in conjunction with a heterozygous state, neonatal hyperbilirubinemia is more pronounced. We believe that unexplained unconjugated hyperbilirubinemia should raise the suspicion of a UGT1A1 gene mutation and should prompt genetic testing. Gilbert syndrome should be added to the differential of severe unconjugated hyperbilirubinemia in the neonate

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