Opposite clinical phenotypes of glucokinase disease: Description of a novel activating mutation and contiguous inactivating mutations in human glucokinase (GCK) gene.

Barbetti F; Cobo Vuilleumier N; Dionisi Vici CToni SCiampalini PMassa ORodriguez Bada PColombo CLenzi LGarcia Gimeno MABermudez Silva FJRodriguez de Fonseca FBanin PAledo JCBaixeras ESanz PCuesta Munoz AL

首页> 外文期刊>Molecular Endocrinology >Opposite clinical phenotypes of glucokinase disease: Description of a novel activating mutation and contiguous inactivating mutations in human glucokinase (GCK) gene.

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Opposite clinical phenotypes of glucokinase disease: Description of a novel activating mutation and contiguous inactivating mutations in human glucokinase (GCK) gene.

机译：Opposite clinical phenotypes of glucokinase disease: Description of a novel activating mutation and contiguous inactivating mutations in human glucokinase (GCK) gene.

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Glucokinase is essential for glucose-stimulated insulin release from the pancreatic beta-cell, serving as glucose sensor in humans. Inactivating or activating mutations of glucokinase lead to different forms of glucokinase disease, i.e. GCK-monogenic diabetes of youth, permanent neonatal diabetes (inactivating mutations), and congenital hyperinsulinism, respectively. Here we present a novel glucokinase gene (GCK)-activating mutation (p.E442K) found in an infant with neonatal hypoglycemia (1.5 mmol/liter) and in two other family members suffering from recurrent hypoglycemic episodes in their childhood and adult life. In contrast to the severe clinical presentation in the index case, functional studies showed only a slight activation of the protein (relative activity index of 3.3). We also report on functional studies of two inactivating mutations of the GCK (p.E440G and p.S441W), contiguous to the activating one, that lead to monogenic diabetes of youth. Interestingly, adult family members carrying the GCK pE440G mutation show an unusually heterogeneous and progressive diabetic phenotype, a feature not typical of GCK-monogenic diabetes of youth. In summary, we identified a novel activating GCK mutation that although being associated with severe neonatal hypoglycemia is characterized by the mildest activation of the glucokinase enzyme of all previously reported.

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《Molecular Endocrinology》 |2009年第12期|1983-1989|共7页
作者
Barbetti F; Cobo Vuilleumier N; Dionisi Vici CToni SCiampalini PMassa ORodriguez Bada PColombo CLenzi LGarcia Gimeno MABermudez Silva FJRodriguez de Fonseca FBanin PAledo JCBaixeras ESanz PCuesta Munoz AL;
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Bambino Gesu Pediatric Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Rome, Italy.;

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正文语种英语
中图分类内分泌腺疾病及代谢病;
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Opposite clinical phenotypes of glucokinase disease: Description of a novel activating mutation and contiguous inactivating mutations in human glucokinase (GCK) gene.

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