Permanent neonatal diabetes and enteric anendocrinosis associated with biallelic mutations in NEUROG3

Citation metadata

Authors: Oscar Rubio-Cabezas, Jan N. Jensen, Maria I. Hodgson, Ethel Codner, Sian Ellard and Palle Serup
Date: Apr. 2011
From: Diabetes(Vol. 60, Issue 4)
Publisher: American Diabetes Association
Document Type: Report
Length: 3,297 words

Main content

Abstract :

OBJECTIVE--NEUROG3 plays a central role in the development of both pancreatic islets and enteroendocrine cells. Homozygons hypomorphic missense mutations in NEUROG3 have been recently associated with a rare form of congenital malabsorptive diarrhea secondary to enteroendocrine cell dysgenesis. Interestingly, the patients did not develop neonatal diabetes but childhood-onset diabetes. We hypothesized that null mutations in NEUROG3 might be responsible for the disease in a patient with permanent neonatal diabetes and severe congenital malabsorptive diarrhea. RESEARCH DESIGN AND METHODS--The single coding exon of NEUROG3 was amplified and sequenced from genomic DNA. The mutant protein isoforms were functionally characterized by measuring their ability to bind to an E-box element in the NEUROD1 promoter in vitro and to induce ectopic endocrine cell formation and cell delamination after in ovo chicken endoderm electroporation. RESULTS--Two different heterozygous point mutations in NEUROG3 were identified in the proband [c.82G T (p.E28X) and c.404T C (p.L135P)], each being inherited from an unaffected parent. Both in vitro and in vivo functional studies indicated that the mutant isoforms are biologically inactive. In keeping with this, no enteroendocrine cells were detected in intestinal biopsy samples from the patient. CONCLUSIONS--Severe deficiency of neurogenin 3 causes a rare novel subtype of permanent neonatal diabetes. This finding confirms the essential role of NEUROG3 in islet development and function in humans.

Source Citation

Source Citation
Rubio-Cabezas, Oscar, et al. "Permanent neonatal diabetes and enteric anendocrinosis associated with biallelic mutations in NEUROG3." Diabetes, vol. 60, no. 4, Apr. 2011, pp. 1349+. Accessed 30 Nov. 2022.

Gale Document Number: GALE|A253543859