The genetic abnormality in the beta cell determines the response to an oral glucose load

Diabetologia
A StrideA T Hattersley

Abstract

We assessed how the role of genes genetic causation in causing maturity-onset diabetes of the young (MODY) alters the response to an oral glucose tolerance test (OGTT). We studied OGTT in 362 MODY subjects, from seven European centres; 245 had glucokinase gene mutations and 117 had Hepatocyte Nuclear Factor -1 alpha ( HNF-1alpha) gene mutations. BMI and age were similar in the genetically defined groups. Fasting plasma glucose (FPG) was less than 5.5 mmol/l in 2 % glucokinase subjects and 46 % HNF-1 alpha subjects ( p < 0.0001). Glucokinase subjects had a higher FPG than HNF-1 alpha subjects ([means +/- SD] 6.8 +/- 0.8 vs 6.0 +/- 1.9 mmol/l, p < 0.0001), a lower 2-h value (8.9 +/- 2.3 vs 11.2 +/- 5.2 mmol/l, p < 0.0001) and a lower OGTT increment (2-h - fasting) (2.1 +/- 2.3 vs 5.2 +/- 3.9 mmol/l, p < 0.0001). The relative proportions classified as diabetic depended on whether fasting (38 % vs 22 %, glucokinase vs HNF-1 alpha) or 2-h values (19 % vs 44 %) were used. Fasting and 2-h glucose values were not correlated in the glucokinase subjects ( r = -0.047, p = 0.65) but were strongly correlated in HNF-1 alpha subjects ( r = 0.8, p < 0.001). Insulin concentrations were higher in the glucokinase subjects throughout the OGTT. The...Continue Reading

Citations

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