Type 2 diabetes susceptibility gene variants predispose to adult-onset autoimmune diabetes
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Aims/hypothesis Latent autoimmune diabetes in adults (LADA) is phenotypically a hybrid of type 1 and type 2 diabetes. Genetically LADA is poorly characterised but does share genetic predisposition with type 1 diabetes. We aimed to improve the genetic characterisation of LADA and hypothesised that type 2 diabetes-associated gene variants also predispose to LADA, and that the associations would be strongest in LADA patients with low levels of GAD autoantibodies (GADA). Methods We assessed 41 type 2 diabetes-associated gene variants in Finnish (phase I) and Swedish (phase II) patients with LADA (n--11) or type 1 diabetes (n--06), all diagnosed after the age of 35?years, as well as in non-diabetic control individuals 40?years or older (n--,002). Results Variants in the ZMIZ1 (rs12571751, p--.1?×-0?) and TCF7L2 (rs7903146, p--.8?×-0?) loci were strongly associated with LADA. Variants in the KCNQ1 (rs2237895, p--.0012), HHEX (rs1111875, p--.0024 in Finns) and MTNR1B (rs10830963, p--.0039) loci showed the strongest association in patients with low GADA, supporting the hypothesis that the disease in these patients is more like type 2 diabetes. In contrast, variants in the KLHDC5 (rs10842994, p--.5?×-0? in Finns), TP53INP1 (rs896854, p--.005), CDKAL1 (rs7756992, p--.0?×-0?; rs7754840, p--.8?×-0?) and PROX1 (rs340874, p--.003) loci showed the strongest association in patients with high GADA. For type 1 diabetes, a strong association was seen for MTNR1B (rs10830963, p--.2?×-0?) and HNF1A (rs2650000, p--.0012). Conclusions/interpretation LADA and adult-onset type 1 diabetes share genetic risk variants with type 2 diabetes, supporting the idea of a hybrid form of diabetes and distinguishing them from patients with classical young-onset type 1 diabetes.

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