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Review Question - QID 213849

Crigler-Najjar Syndrome Introduction Hereditary unconjugated hyperbilirubinemia QID: 213849 (M1.OMB.1)
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QID 213849 (Type "213849" in App Search)
A 3-day-old boy is brought to the emergency department after his parents thought he was excessively tired at home. Specifically, they say he sleeps significantly more than he did at birth, and his extremities are limp when he is picked up. He was born at home and did not appear to have any gross deformities at that time. On presentation, he is found to be lethargic and hypotonic. Physical exam reveals yellowing of the skin and labs are obtained as follows:

Alanine aminotransferase (ALT): 14 U/L
Aspartate aminotransferase (AST): 12 U/L
Alkaline phosphatase: 32 U/L
Total bilirubin: 24 mg/dL
Direct bilirubin: 2.3 mg/dL
Hemoglobin: 14.1 g/dL

What is the most likely cause of this patient's disorder?
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