Insulin gene mutations as cause of diabetes in children negative for five type 1 diabetes autoantibodies.

Abstract:

OBJECTIVE:Heterozygous, gain-of-function mutations of the insulin gene can cause permanent diabetes with onset ranging from the neonatal period through adulthood. The aim of our study was to screen for the insulin gene in patients who had been clinically classified as type 1 diabetic but who tested negative for type 1 diabetes autoantibodies. RESEARCH DESIGN AND METHODS:We reviewed the clinical records of 326 patients with the diagnosis of type 1 diabetes and identified seven probands who had diabetes in isolation and were negative for five type 1 diabetes autoantibodies. We sequenced the INS gene in these seven patients. RESULTS:In two patients whose diabetes onset had been at 2 years 10 months of age and at 6 years 8 months of age, respectively, we identified the mutation G(B8)S and a novel mutation in the preproinsulin signal peptide (A(Signal23)S). CONCLUSIONS:Insulin gene mutations are rare in absolute terms in patients classified as type 1 diabetic (0.6%) but can be identified after a thorough screening of type 1 diabetes autoantibodies.

journal_name

Diabetes Care

journal_title

Diabetes care

authors

Bonfanti R,Colombo C,Nocerino V,Massa O,Lampasona V,Iafusco D,Viscardi M,Chiumello G,Meschi F,Barbetti F

doi

10.2337/dc08-0783

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

123-5

issue

1

eissn

0149-5992

issn

1935-5548

pii

dc08-0783

journal_volume

32

pub_type

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