Partial ABCC8 gene deletion mutations causing diazoxide-unresponsive hyperinsulinaemic hypoglycaemia.

Abstract:

:Inactivating mutations in the pancreatic beta cell ATP-sensitive potassium (K(ATP) ) channel genes are identified by sequencing in approximately 80% of patients with diazoxide-unresponsive hyperinsulinaemic hypoglycaemia (HH). Genetic testing is clinically important as the mode of inheritance of a K(ATP) channel mutation(s) provides information on the histological subtype. For example in patients with a single paternally inherited mutation a focal lesion is possible and once confirmed, the patient can undergo a curative lesionectomy. By contrast, recessive inheritance indicates diffuse disease, which requires near-total pancreatectomy, if medical management is unsuccessful. We investigated ABCC8 and KCNJ11 gene dosage in 29 probands from a cohort of 125 with diazoxide-unresponsive HH where sequencing did not provide a genetic diagnosis. We identified heterozygous partial ABCC8 deletions in four probands. In two cases with focal pancreatic disease, a paternally inherited deletion was found. Two other probands with diffuse pancreatic disease were compound heterozygotes for a deletion and a recessively acting mutation that had been identified by sequencing. Family member studies confirmed compound heterozygosity for the deletion and the missense mutation in two affected siblings of one proband. Heterozygous deletions of the ABCC8 gene are a rare, but important cause of diazoxide-unresponsive HH. Dosage analysis should be undertaken in all patients when sequencing analysis does not confirm the genetic diagnosis as confirmation of the mode of inheritance can guide clinical management and will provide important information regarding recurrence risk.

journal_name

Pediatr Diabetes

journal_title

Pediatric diabetes

authors

Flanagan S,Damhuis A,Banerjee I,Rokicki D,Jefferies C,Kapoor R,Hussain K,Ellard S

doi

10.1111/j.1399-5448.2011.00821.x

subject

Has Abstract

pub_date

2012-05-01 00:00:00

pages

285-9

issue

3

eissn

1399-543X

issn

1399-5448

journal_volume

13

pub_type

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