Defective ABCC8 does not form functional KATP channels, causing hyperinsulinemic hypoglycemia

Stable Identifier
R-HSA-5683113
Type
Reaction [transition]
Species
Homo sapiens
Compartment
plasma membrane
ReviewStatus
5/5
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Defective ABCC8 does not form functional KATP channels, causing hyperinsulinemic hypoglycemia
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ATP-binding cassette sub-family C member 8 (ABCC8) is a subunit of the beta-cell ATP-sensitive potassium channel (KATP). KATP channels play an important role in the control of insulin release. Elevation of the ATP:ADP ratio closes KATP channels leading to cellular depolarisation, calcium influx and exocytosis of insulin from its storage granules. Defects in ABCC8 can cause dysregulation of insulin secretion resulting in hyperglycemias or hypoglycemias.

Familial hyperinsulinemic hypoglycemia (see HHF1; MIM:256450) is a disorder caused by defective negative feedback regulation of insulin secretion (persistent hyperinsulinism) leading to severe hypoglycemia. The most commom ABCC8 mutations causing HHF1 include F1388del, A1330Gfs*35, V187D and E1507K (Thomas et al. 1995, Nestorowicz et al. 1996, Otonkoshi et al. 1999).
Literature References
PubMed ID Title Journal Year
8923011 Mutations in the sulonylurea receptor gene are associated with familial hyperinsulinism in Ashkenazi Jews

Bryan, J, Landau, H, Wilson, BA, Nestorowicz, A, Aguilar-Bryan, L, Inoue, H, Permutt, MA, Thornton, PS, Stanley, CA, Clement, JP, Glaser, B, Schoor, KP

Hum. Mol. Genet. 1996
7847376 Homozygosity mapping, to chromosome 11p, of the gene for familial persistent hyperinsulinemic hypoglycemia of infancy

Thomas, PM, Mathew, PM, Hallman, DM, Cote, GJ

Am. J. Hum. Genet. 1995
10334322 A point mutation inactivating the sulfonylurea receptor causes the severe form of persistent hyperinsulinemic hypoglycemia of infancy in Finland

Otonkoski, T, Huang, E, Ammälä, C, Kere, J, Cote, GJ, Thomas, PM, Huopio, H, Ashfield, R, Komulainen, J, Dunne, MJ, Ashcroft, FM, Chapman, J, Cosgrove, K

Diabetes 1999
Participants
Input
Participates
as an event of
Normal reaction
KCNJ11 tetramer:ABCC8 tetramer binds 4xATP, closing the channel (Homo sapiens)
Functional status

Loss of function of KCNJ11 tetramer:ABCC8 mutants [plasma membrane]

Normal Entity
Disease Entity
Status
Disease
Name Identifier Synonyms
hyperinsulinemic hypoglycemia DOID:13317 Islet cell hyperplasia, nesidioblastosis, persistent hyperinsulinemia hypoglycemia of infancy
Authored
Jassal, B  (2015-03-12)
Reviewed
Shukla, S  (2015-09-15)
Created
Jassal, B  (2015-03-12)
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