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Concept
Gilbert's syndrome
Summary
Gilbert syndrome (GS) is a syndrome in which the liver of affected individuals processes bilirubin more slowly than the majority. Many people never have symptoms. Occasionally jaundice (a slight yellowish color of the skin or whites of the eyes) may occur.
Gilbert syndrome is due to a genetic variant in the UGT1A1 gene which results in decreased activity of the bilirubin uridine diphosphate glucuronosyltransferase enzyme. It is typically inherited in an autosomal recessive pattern and occasionally in an autosomal dominant pattern depending on the type of variant. Episodes of jaundice may be triggered by stress such as exercise, menstruation, or not eating. Diagnosis is based on higher levels of unconjugated bilirubin in the blood without either signs of other liver problems or red blood cell breakdown.
Typically no treatment is needed. Gilbert syndrome is associated with decreased cardiovascular health risks. If jaundice is significant phenobarbital may be used, which aids in the conjugation of bilirubin. Gilbert syndrome affects about 5% of people in the United States. Males are more often diagnosed than females. It is often not noticed until late childhood to early adulthood. The condition was first described in 1901 by Augustin Nicolas Gilbert.
Gilbert syndrome produces an elevated level of unconjugated bilirubin in the bloodstream, but normally has no consequences. Mild jaundice may appear under conditions of exertion, stress, fasting, and infections, but the condition is otherwise usually asymptomatic. Severe cases are seen by yellowing of the skin tone and yellowing of the conjunctiva in the eye.
Gilbert syndrome has been reported to contribute to an accelerated onset of neonatal jaundice. The syndrome cannot cause severe indirect hyperbilirubinemia in neonates by itself, but it may have a summative effect on rising bilirubin when combined with other factors, for example in the presence of increased red blood cell destruction due to diseases such as G6PD deficiency.
Official source
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