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Comprehensive Genetic Testing for Clinical Decision-Making in a Patient With Congenital Hyperinsulinism.

Matthias Begemann1, Johannes Alexander Tobias Boy2, Florian Kraft1

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|December 24, 2025
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Summary

This case study highlights advanced genetic testing for diagnosing diffuse congenital hyperinsulinism (CHI) in a preterm infant. Comprehensive analysis is crucial for tailored treatment and family genetic counseling.

Keywords:
comprehensive geneticcongenital hyperinsulinismlong-read sequencingneonatal hypoglycemiatherapeutic algorithm in CHI

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Area of Science:

  • Genetics
  • Pediatrics
  • Medical Diagnostics

Background:

  • Congenital hyperinsulinism (CHI) is a rare genetic disorder causing persistent hypoglycemia.
  • Autosomal recessive ABCC8 gene mutations are a significant cause of diffuse CHI.
  • Accurate molecular diagnosis is essential for differentiating focal from diffuse forms of CHI.

Purpose of the Study:

  • To present a case study of a preterm newborn with ABCC8 gene-related diffuse CHI.
  • To emphasize the role of advanced genetic testing in achieving molecular diagnosis.
  • To highlight the clinical and genetic complexities of CHI management.

Main Methods:

  • Interdisciplinary clinical management of the patient.
  • Advanced genetic testing, including long-read sequencing, for molecular diagnosis.
  • Differential diagnosis between focal and diffuse CHI forms.

Main Results:

  • Successful molecular diagnosis of autosomal recessive ABCC8 gene-related diffuse CHI.
  • Identification of genetic findings crucial for immediate treatment decisions.
  • Facilitation of genetic counseling regarding recurrence risks and prenatal diagnosis.

Conclusions:

  • Comprehensive genetic analysis is vital for accurate CHI diagnosis and tailored treatment.
  • State-of-the-art genetic technologies integrated with interdisciplinary care improve patient outcomes.
  • Understanding genetic intricacies aids in family counseling and future reproductive planning.