Hyperinsulinism of the newborn

Area of Science:

• Endocrinology
• Genetics
• Pediatrics

Background:

• Neonatal hyperinsulinism (HI) is a critical condition causing persistent hypoglycemia in newborns due to pancreatic beta-cell dysfunction.
• It is the most common cause of persistent neonatal hypoglycemia, often requiring difficult treatments like pancreatectomy to prevent brain damage.

Purpose of the Study:

• To review recent advancements in understanding the pathophysiology of neonatal hyperinsulinism.
• To highlight the genetic basis and modes of transmission for HI.
• To discuss the implications of these findings for clinical management and genetic counseling.

Main Methods:

• Review of recent scientific literature on neonatal hyperinsulinism.
• Analysis of genetic mutations associated with the disease, including KATP channel, glucokinase, and glutamate dehydrogenase genes.
• Discussion of inheritance patterns (autosomal recessive and dominant) and focal vs. diffuse disease.

Main Results:

• Most HI cases result from recessive mutations in KATP channel genes (SUR1 or Kir6.2).
• Novel genetic causes include activating mutations in glucokinase (autosomal dominant) and glutamate dehydrogenase (GLUD-1) associated with hyperammonemia.
• HI can be transmitted as autosomal recessive or dominant traits, with focal pancreatic involvement described.

Conclusions:

• Understanding the genetic heterogeneity of HI aids therapeutic decisions and genetic counseling.
• Despite progress, the metabolic origin remains unknown in approximately 50% of cases.
• Continued research is crucial for a comprehensive understanding and improved management of neonatal hyperinsulinism.