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Clinical characteristics of recessive and dominant congenital hyperinsulinism due to mutation(s) in the ABCC8/KCNJ11 genes encoding the ATP-sensitive potasium channel in the pancreatic beta cell
-
Gönül Öçal
,
Sian Ellard
Published/Copyright:
November 22, 2011
Abstract
Background: Recessive mutations in ABCC8/KCNJ11 of β-cell KATP channel generally cause severe medically unresponsive hyperinsulinemic hypoglycemia (HH). Rarer dominant mutations in these genes have been described that mostly cause milder, medically responsive congenital hyperinsulinism. Rarer dominant mutations in these genes have been described that mostly cause milder, medically responsive congenital hyperinsulinism. To date the phenotype of patients with dominant mutations seems to be different from those with recessive mutations as the majority of patients are responsive to diazoxide therapy. Controversy exists on whether these dominant ABCC8 or KCNJ11 genes mutations predispose to diabetes mellitus in adulthood or not.
Subjects: We report the clinical and genetic characteristics of five patients with neonatal HH, three had recessively inherited KATP channel mutations and two with a dominantly acting mutation. As a result of failure to medical therapy, patients with recessive KATP channel mutations underwent a near total pancreatectomy. Two siblings with a novel dominant mutation showed good response to medical treatment. Although the HH remitted in early infancy, they became diabetic at the prepubertal age. Their mother, maternal aunt and maternal grandfather had the same mutation without any medical history of neonatal HH.
Conclusion: The clinical presentation of our two patients with a dominant ABCC8 mutation was milder than that of patients with the resessive form of the disease as they responded well to medical management.
Received: 2011-7-10
Accepted: 2011-10-24
Published Online: 2011-11-22
Published in Print: 2011-12-01
©2011 by Walter de Gruyter Berlin Boston
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