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An ABCC8 Nonsense Mutation Causing Neonatal Diabetes Through Altered Transcript Expression.

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Recessive loss-of-function mutations in ABCC8 cause neonatal diabetes by altering K-ATP channel function. This unexpected finding expands the known spectrum of mutations linked to neonatal diabetes.

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Area of Science:

  • Endocrinology
  • Molecular Genetics
  • Ion Channel Physiology

Background:

  • The pancreatic ATP-sensitive K+ (K-ATP) channel, composed of Kir6.2 (KCNJ11) and SUR1 (ABCC8) subunits, is crucial for insulin secretion.
  • Gain-of-function mutations in KCNJ11 or ABCC8 cause neonatal diabetes, while loss-of-function mutations lead to congenital hyperinsulinism.

Observation:

  • Two unrelated Vietnamese patients presented with neonatal diabetes.
  • Unexpectedly, these patients harbored recessively inherited, loss-of-function mutations (ABCC8 p.Glu747*) in the ABCC8 gene.

Findings:

  • A homozygous nonsense mutation in ABCC8 (p.Glu747*) was identified, leading to the absence of full-length SUR1 mRNA.
  • Alternative splicing resulted in a transcript lacking exon 17, altering K-ATP channel function.
  • Patients responded successfully to sulfonylurea treatment, indicating enhanced K-ATP channel sensitivity to Mg-ADP/ATP.

Implications:

  • This study reports the first instance of an ABCC8 nonsense mutation causing a gain-of-channel function, leading to neonatal diabetes.
  • These findings broaden the understanding of K-ATP channel mutations and their diverse clinical manifestations in neonatal diabetes.
  • The results highlight the importance of considering recessive inheritance patterns for K-ATP channelopathies.