Chapter 20

Monogenic Causes of Diabetes

Brittany L. Resnick

Brittany L. Resnick

Exeter NIHR Clinical Research Facility, Royal Devon University Healthcare NHS Foundation Trust, Exeter, UK

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Maggie H. Shepherd

Maggie H. Shepherd

Exeter NIHR Clinical Research Facility, Royal Devon University Healthcare NHS Foundation Trust, Exeter, UK

Institute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK

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Andrew T. Hattersley

Andrew T. Hattersley

Institute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK

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First published: 12 January 2024

Summary

Monogenic diabetes results from inheritance of one or more variants in a single gene and accounts for 1–3% of diabetes cases diagnosed under the age of 30 years. The majority (90%) of monogenic diabetes cases are initially misdiagnosed as type 1 diabetes or type 2 diabetes. Monogenic diabetes where the primary disorder affects the β cell has four main clinical presentations: familial mild fasting hyperglycaemia (glucokinase maturityonset diabetes of the young, MODY); familial young-onset diabetes (transcription factor MODY); neonatal diabetes; and diabetes with extra-pancreatic features. Diagnostic testing for the major causes of monogenic diabetes is now widely available. Molecular genetic testing is traditionally guided by the clinical phenotype and also the relative prevalence of variants within that population. Glucokinase catalyses the phosphorylation of glucose to glucose-6-phosphate, the first and rate-limiting step in intracellular glucose metabolism in both β cells and hepatocytes.

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