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Compound Heterozygosity for the Common Sulfonylurea Receptor Mutations Can Cause Mild Diazoxide-Sensitive Hyperinsulinism

Department of Pediatrics, Sheba Medical Center, The Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel

Daniel Lubin, MD

Department of Neonatology, Sheba Medical Center, The Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel

Dalit Modan-Moses, MD

Department of Pediatrics, Sheba Medical Center, The Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel

Jacob Quint, MD

Department of Neonatology, Sheba Medical Center, The Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel

Benjamin Glaser, MD

Department of Endocrinology and Metabolism, The Hebrew University, Hadassah Medical Center, Jerusalem, Israel

Joseph Meyerovitch, MD

Department of Pediatrics, Sheba Medical Center, The Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Pediatric Endocrinology Outpatient Clinics, Pediatric Division, Chaim Sheba Medical Center, Tel Hashomer 52621, Israel

Persistent hyperinsulinemic hypoglycemia of infancy (PHHI) is a disorder characterized by dysregulation of insulin secretion and prolonged hypoglycemia. Mutations in the genes of both subunits of the P-cell KATP channel, Kir 6.2 (potassium channel) and SUR1 (sulfonylurea receptor) have been associated with the autosomal recessive form of this disorder. It was previously demonstrated that patients harboring SURI mutations often do not respond well to diazoxide. A patient is reported of compound heterozygosity for the 2 most common mutations previously reported to be associated with PHHI in Ashkenazi Jews; splice mutation of intron 32 (3993-9G->A) and deletion of phenylalanine at position 1388. Relatively low glucose utilization (<10 mg/kg/min) was needed to maintain blood glucose concentrations. In addition, treatment with diazoxide was highly effective. We suggest that diazoxide unresponsiveness is not always present in patients with SURI mutations and that the probable cause of the milder phenotype in this compund heterozygote state is the splice mutation.

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				M. J. DUNNE, K. E. COSGROVE, R. M. SHEPHERD, A. AYNSLEY-GREEN, and K. J. LINDLEY Hyperinsulinism in Infancy: From Basic Science to Clinical Disease Physiol Rev, January 1, 2004; 84(1): 239 - 275. [Abstract] [Full Text] [PDF]