Diazoxide-responsive Hyperinsulinemic Hypoglycemia Caused by HNF4A Gene Mutations

Overview

Journal Eur J Endocrinol

Publisher Oxford University Press

Specialty Endocrinology

Date 2010 Feb 19

PMID 20164212

Citations 68

Authors

S E Flanagan

R R Kapoor

G Mali

D Cody

N Murphy

B Schwahn

T Siahanidou

I Banerjee

T Akcay

O Rubio-Cabezas

J P H Shield

K Hussain

S Ellard

Affiliations

Soon will be listed here.

Abstract

Objective: The phenotype associated with heterozygous HNF4A gene mutations has recently been extended to include diazoxide responsive neonatal hypoglycemia in addition to maturity-onset diabetes of the young (MODY). To date, mutation screening has been limited to patients with a family history consistent with MODY. In this study, we investigated the prevalence of HNF4A mutations in a large cohort of patients with diazoxide responsive hyperinsulinemic hypoglycemia (HH).

Subjects And Methods: We sequenced the ABCC8, KCNJ11, GCK, GLUD1, and/or HNF4A genes in 220 patients with HH responsive to diazoxide. The order of genetic testing was dependent upon the clinical phenotype.

Results: A genetic diagnosis was possible for 59/220 (27%) patients. K(ATP) channel mutations were most common (15%) followed by GLUD1 mutations causing hyperinsulinism with hyperammonemia (5.9%), and HNF4A mutations (5%). Seven of the 11 probands with a heterozygous HNF4A mutation did not have a parent affected with diabetes, and four de novo mutations were confirmed. These patients were diagnosed with HI within the first week of life (median age 1 day), and they had increased birth weight (median +2.4 SDS). The duration of diazoxide treatment ranged from 3 months to ongoing at 8 years.

Conclusions: In this large series, HNF4A mutations are the third most common cause of diazoxide responsive HH. We recommend that HNF4A sequencing is considered in all patients with diazoxide responsive HH diagnosed in the first week of life irrespective of a family history of diabetes, once K(ATP) channel mutations have been excluded.

Citing Articles

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