ISSN: 1308-5727 | E-ISSN: 1308-5735
Volume: 16 Issue: 1 Year: 2024
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Turkish Society for Pediatric Endocrinology and Diabetes
A Novel KCNJ11 Mutation Associated with Transient Neonatal Diabetes [J Clin Res Pediatr Endocrinol]
J Clin Res Pediatr Endocrinol. 2018; 10(2): 175-178 | DOI: 10.4274/jcrpe.5166

A Novel KCNJ11 Mutation Associated with Transient Neonatal Diabetes

Evangelia Gole1, Stavroula Oikonomou1, Sian Ellard2, Elisa De Franco2, Kyriaki Karavanaki1
1University of Athens, 2nd Department of Pediatrics, “P&A Kyriakou” Children’s Hospital, Diabetes and Metabolism Unit, Athens, Greece
2University of Exeter Medical School, Institute of Biomedical and Clinical Science, Exeter, United Kingdom

Neonatal diabetes mellitus (NDM) is a rare type of monogenic diabetes that presents in the first 6 months of life. Activating mutations in the KCNJ11 gene encoding for the Kir6.2 subunit of the ATP-sensitive potassium (KATP ) channel can lead to transient NDM (TNDM) or to permanent NDM (PNDM). A female infant presented on the 22nd day of life with severe hyperglycemia and ketoacidosis (glucose: 907mg/dL, blood gas pH: 6.84, HCO3: 6 mmol/L). She was initially managed with intravenous (IV) fluids and IV insulin. Ketoacidosis resolved within 48 hours and she was started on subcutaneous insulin injections with intermediate acting insulin NPH twice daily requiring initially 0.75-1.35 IU/kg/d. Pre-prandial C-peptide levels were 0.51 ng/mL (normal: 1.77-4.68). Insulin requirements were gradually reduced and insulin administration was discontinued at the age of 10 months with subsequent normal glucose and HbA1c levels. C-peptide levels normalized (pre-prandial: 1.6 ng/mL, postprandial: 2 ng/mL). Genetic analysis identified a novel missense mutation (p.Pro254Gln) in the KCNJ11 gene. We report a novel KCNJ11 mutation in a patient who presented in the first month of life with a phenotype of NDM that subsided at the age of 10 months. It is likely that the novel p.P254Q mutation results in mild impairment of the KATP channel function leading to TNDM.

Keywords: Neonatal diabetes, KCNJ11, hyperglycemia, transient

Evangelia Gole, Stavroula Oikonomou, Sian Ellard, Elisa De Franco, Kyriaki Karavanaki. A Novel KCNJ11 Mutation Associated with Transient Neonatal Diabetes. J Clin Res Pediatr Endocrinol. 2018; 10(2): 175-178
Manuscript Language: English
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