UGT1A1 Gene (GILBERT

Gilbert’s syndrome is a common, benign inherited liver disorder caused by reduced activity of the UGT1A1 enzyme, which impairs bilirubin conjugation. It leads to mild, intermittent unconjugated hyperbilirubinemia and occasional jaundice, often triggered by fasting, illness, stress, or dehydration. Most people are asymptomatic and need no treatment; diagnosis is by blood tests showing elevated unconjugated bilirubin and sometimes genetic testing.

Gilbert's syndrome is caused by reduced activity of the UGT1A1 gene, which encodes the enzyme UDP‑glucuronosyltransferase 1A1. Commonly a promoter TA repeat variant (UGT1A1*28) or other UGT1A1 mutations decrease bilirubin conjugation, leading to mild unconjugated hyperbilirubinemia. It’s usually inherited with variable penetrance and is generally benign, with jaundice triggered by stress or fasting.

The genetic test detects variants in the UGT1A1 gene, especially the promoter TA-repeat insertion (UGT1A1*28, seven repeats) and other coding changes. Testing uses PCR-based fragment analysis, targeted genotyping, or sequencing to confirm reduced UGT1A1 activity when unconjugated hyperbilirubinemia suggests Gilbert syndrome. Results can confirm diagnosis and guide genetic counseling; many cases remain clinically diagnosed.

Gilbert’s syndrome is a common, mild inherited condition causing intermittent unconjugated bilirubin elevation due to reduced UGT1A1 activity, producing mild jaundice during stress, fasting, or illness. COVID-19 can trigger higher bilirubin and transient jaundice in affected people, but it usually doesn’t cause serious liver damage or worse outcomes. Management is supportive: treat COVID, avoid fasting/dehydration, monitor liver tests and inform clinicians.

Avoid prolonged fasting or crash diets, dehydration and excessive alcohol — these commonly raise bilirubin in Gilbert’s. Also limit grapefruit/grapefruit juice and be cautious with herbal supplements (for example, St. John’s wort) or foods that alter liver metabolism. Maintain regular meals, good hydration and avoid rapid weight loss; check with your clinician before starting new supplements or unusual diets.

Gilbert’s syndrome is a common, mild genetic liver condition causing intermittent mild unconjugated jaundice. It usually produces no serious health problems, requires no treatment, and does not shorten life expectancy. Jaundice can appear during illness, fasting, or stress. Most people need only reassurance; avoiding certain drugs and informing clinicians is advised.