Prolonged indirect hyperbilirubinemia in a moderately preterm boy with Mediterranean glucose-6-phosphate...

Area of Science:

• Neonatal Medicine
• Clinical Genetics
• Biochemistry

Background:

• Neonatal hyperbilirubinemia is a common condition in newborns.
• Genetic factors, such as glucose-6-phosphate dehydrogenase (G6PD) deficiency and glutathione S-transferase Mu 1 (GSTM1) null mutations, are known risk factors for unconjugated hyperbilirubinemia.
• Uridine diphosphate glucuronosyltransferase 1A1 (UGT1A1) gene mutations are also associated with hyperbilirubinemia.

Observation:

• A 33-week gestation infant with Mediterranean G6PD deficiency and GSTM1*0/*0 genotype presented with prolonged indirect hyperbilirubinemia (PIH).
• The infant showed no signs of hemolysis, infection, or exposure to oxidizing agents.
• The patient's siblings, who lacked UGT1A1 mutations, had varying G6PD and GSTM1 genotypes without a history of neonatal hyperbilirubinemia.

Findings:

• The case suggests a potential link between prematurity, G6PD deficiency, and GSTM1*0/*0 genotype in the development of PIH.
• The absence of UGT1A1 mutations in the affected infant and siblings indicates this gene is not the primary cause in this family.
• The findings point towards a multifactorial etiology for PIH, involving the interplay of genetic predispositions and gestational age.

Implications:

• This case highlights the importance of considering combined genetic and non-genetic factors in assessing the risk of prolonged indirect hyperbilirubinemia.
• Further research is warranted to confirm the role of G6PD deficiency and GSTM1*0/*0 mutations, in conjunction with prematurity, as risk factors for PIH.
• Understanding these combined risk factors can aid in early identification and management of infants at risk for severe hyperbilirubinemia.