Novel ABCC8 (SUR1) gene mutations in Asian Indian children with congenital hyperinsulinemic hypoglycemia.

Abstract

Congenital hyperinsulinemic hypoglycemia (HI) is a heterogeneous genetic disorder of insulin secretion characterized by persistent hypoglycemia, most commonly associated with inactivating mutations of the β-cell ATP-sensitive K(+) channel (K(ATP) channel) genes ABCC8 (encoding SUR1) and KCNJ11(encoding Kir6.2). This study aimed to screen the mutations in the genes associated with congenital HI in Asian Indian children. Recessive mutations of these genes cause hyperinsulinism that is unresponsive to treatment with channel agonists like diazoxide. Dominant K(ATP) mutations have been associated with diazoxide-responsive disease. The KCNJ11, ABCC8, GCK, HNF4A, and GLUD1 genes were analyzed by sequence analysis in 22 children with congenital HI. We found 10 novel mutations (c.1delA, c.61delG, c.267delT, c.619-629delCCCGAGGACCT, Gln444*, Leu724Pro, Ala847Thr, Trp898*, IVS30-2A>C, and Leu1454Arg) and two known mutations (Gly111Arg and Arg598*) in the ABCC8 gene. This study describes novel and known ABCC8 gene mutations in children with congenital HI. This is the first large genetic screening study on HI in India and our results will help clinicians in providing optimal treatment for patients with hyperinsulinemia and in assisting affected families with genetic counseling.

• Authors: Suresh Jahnavi, Varadarajan Poovazhagi, Sekar Kanthimathi, Kandasamy Balamurugan, Dhanasekaran Bodhini, Jaivinder Yadav, Vandana Jain, Rajesh Khadgawat, Mahuya Sikdar, Ayurchelvan Bhavatharini, Ashok Kumar Das, Tanvir Kaur, Viswanathan Mohan, Venkatesan Radha
• Journal: Annals of human genetics (Ann Hum Genet) Vol. 78 Issue 5 Pg. 311-9 (Sep 2014) ISSN: 1469-1809 [Electronic] England
• PMID: 25117148 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2014 John Wiley & Sons Ltd/University College London.

Chemical References

• ABCC8 protein, human
• C-Peptide
• Insulin
• Sulfonylurea Receptors
• Diazoxide

Topics

• Asian People (genetics)
• Base Sequence
• C-Peptide (blood)
• Congenital Hyperinsulinism (epidemiology, genetics, pathology)
• Diazoxide
• Humans
• India (epidemiology)
• Insulin (blood)
• Molecular Sequence Data
• Mutation (genetics)
• Sequence Analysis, DNA
• Sulfonylurea Receptors (genetics)