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Reiling, E; van 't Riet, E; Groenewoud, M. J; Welschen, L. M. C; van Hove, E. C; Nijpels, G; Maassen, J. A; Dekker, J. M; t Hart, L. M
Diabetologia, 09/2009, Volume: 52, Issue: 9Journal Article
Aims/hypothesis Variation in fasting plasma glucose (FPG) within the normal range is a known risk factor for the development of type 2 diabetes. Several reports have shown that genetic variation in the genes for glucokinase (GCK), glucokinase regulatory protein (GCKR), islet-specific glucose 6 phosphatase catalytic subunit-related protein (G6PC2) and melatonin receptor type 1B (MTNR1B) is associated with FPG. In this study we examined whether these loci also contribute to type 2 diabetes susceptibility. Methods A random selection from the Dutch New Hoorn Study was used for replication of the association with FGP (2,361 non-diabetic participants). For the genetic association study we extended the study sample with 2,628 participants with type 2 diabetes. Risk allele counting was used to calculate a four-gene risk allele score for each individual. Results Variants of the GCK, G6PC2 and MTNR1B genes but not GCKR were associated with FPG (all, p <= 0.001; GCKR, p = 0.23). Combining these four genes in a risk allele score resulted in an increase of 0.05 mmol/l (0.04-0.07) per additional risk allele (p = 2 x 10⁻¹³). Furthermore, participants with less than three or more than five risk alleles showed significantly different type 2 diabetes susceptibility compared with the most common group with four risk alleles (OR 0.77 0.65-0.93, p = 0.005 and OR 2.05 1.50-2.80, p = 4 x 10⁻⁶ respectively). The age at diagnosis was also significantly associated with the number of risk alleles (p = 0.009). Conclusions A combined risk allele score for single-nucleotide polymorphisms in four known FPG loci is significantly associated with FPG and HbA₁c in a Dutch population-based sample of non-diabetic participants. Carriers of low or high numbers of risk alleles show significantly different risks for type 2 diabetes compared with the reference group.
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