Hyperinsulinism in infancy--genetic aspects

Area of Science:

• Pediatric Endocrinology
• Molecular Genetics
• Metabolic Disorders

Background:

• Hyperinsulinism in infancy (HI) presents diverse clinical, genetic, and histological features.
• Understanding the molecular basis of HI is crucial for diagnosis and therapeutic decisions in pediatric endocrinology.

Purpose of the Study:

• To review the genetic etiologies of hyperinsulinism in infancy.
• To correlate genetic findings with clinical presentation and treatment response.

Main Methods:

• Review of genetic mutations in HI.
• Analysis of genotype-phenotype relationships.

Main Results:

• Genetic causes are identified in 50-60% of HI cases.
• Common mutations include ABCC8 (SUR1) and KCNJ11 (KIR6.2), followed by GLUD1 (GDH).
• GLUD1 mutations are associated with hyperammonemia (HA); GCK mutations are rare and typically mild.

Conclusions:

• Genetic analysis provides valuable information for beta-cell disorders in HI.
• While some mutations (GLUD1, GCK) show milder phenotypes, KATP channel mutations lack clear genotype-phenotype correlations.
• Advances in molecular understanding enhance diagnostic and therapeutic strategies for HI.