Monogenic hyperinsulinemic hypoglycemia: current insights into the pathogenesis and management

Area of Science:

• Pediatric Endocrinology
• Medical Genetics
• Molecular Biology

Background:

• Hyperinsulinism (HI) is the primary cause of persistent hypoglycemia in children, potentially leading to developmental delays and neurological damage.
• Understanding the molecular basis of HI has advanced significantly, with nine known causative genes identified.
• Inactivating KATP channel mutations represent the most common and severe form of HI, presenting as focal or diffuse disease.

Purpose of the Study:

• To review the genetic causes of hyperinsulinism and their clinical implications.
• To highlight diagnostic strategies for timely recognition of hyperinsulinism.
• To discuss current management approaches, including surgical interventions and advanced imaging techniques.

Main Methods:

• Review of genetic mutations associated with hyperinsulinism, including KATP channel, GDH, and GK.
• Description of diagnostic procedures such as critical sample analysis and glucagon stimulation tests.
• Evaluation of treatment strategies, including diazoxide trials, pancreatectomy, and 18F-DOPA PET scans for lesion localization.

Main Results:

• Mutations in genes like KATP, GDH, and GK are key genetic drivers of hyperinsulinism.
• Diagnostic tests can identify HI, and response to diazoxide can indicate KATP channel defects.
• 18F-DOPA PET scans offer high sensitivity and specificity in differentiating focal from diffuse disease and localizing lesions.

Conclusions:

• Prompt diagnosis and understanding the genetic basis of hyperinsulinism are crucial for preventing severe outcomes in children.
• Distinguishing between focal and diffuse disease is essential for surgical management, with pancreatectomy offering a cure for focal forms.
• Advances in genetic understanding and imaging technologies like 18F-DOPA PET scans are improving management and outcomes for children with hyperinsulinism.