Genetic risk of type 2 diabetes modifies the effects of a lifestyle intervention aimed at the prevention of gestational and postpartum diabetes

Emilia Huvinen, Jari Lahti, Miira M Klemetti, Paula H Bergman, Katri Räikkönen, Marju Orho-Melander, Hannele Laivuori, Saila B Koivusalo, Emilia Huvinen, Jari Lahti, Miira M Klemetti, Paula H Bergman, Katri Räikkönen, Marju Orho-Melander, Hannele Laivuori, Saila B Koivusalo

Abstract

Aims/hypothesis: The aim of this study was to assess the interaction between genetic risk and lifestyle intervention on the occurrence of gestational diabetes mellitus (GDM) and postpartum diabetes.

Methods: The RADIEL study is an RCT aimed at prevention of GDM and postpartum diabetes through lifestyle intervention. Participants with a BMI ≥30 kg/m2 and/or prior GDM were allocated to intervention and control groups before pregnancy or in early pregnancy. The study visits took place every 3 months before pregnancy, once in each trimester, and at 6 weeks and 6 and 12 months postpartum. We calculated a polygenic risk score (PRS) based on 50 risk variants for type 2 diabetes.

Results: Altogether, 516 participants provided genetic and GDM data. The PRS was associated with higher glycaemic levels (fasting glucose and/or HbA1c) and a lower insulin secretion index in the second and third trimesters and at 12 months postpartum, as well as with a higher occurrence of GDM and glycaemic abnormalities at 12 months postpartum (n = 356). There was an interaction between the PRS and lifestyle intervention (p=0.016 during pregnancy and p=0.024 postpartum) when analysing participants who did not have GDM at the first study visit during pregnancy (n = 386). When analysing women in tertiles according to the PRS, the intervention was effective in reducing the age-adjusted occurrence of GDM only among those with the highest genetic risk (OR 0.37; 95% CI 0.17, 0.82). The risk of glycaemic abnormalities at 12 months postpartum was reduced in the same group after adjusting additionally for BMI, parity, smoking and education (OR 0.35; 95% CI 0.13, 0.97).

Conclusions/interpretation: Genetic predisposition to diabetes modifies the response to a lifestyle intervention aimed at prevention of GDM and postpartum diabetes. This suggests that lifestyle intervention may benefit from being tailored according to genetic risk.

Clinical trial registration: ClinicalTrials.gov identifier: NCT01698385.

Keywords: Diet; Genetic risk; Gene–environment interaction; Gestational diabetes; Lifestyle intervention; Physical activity; Polygenic risk score; Prevention; Type 2 diabetes.

© 2022. The Author(s).

Figures

Fig. 1
Fig. 1
Occurrence of GDM among women in the control and intervention groups according to their genetic risk of type 2 diabetes (tertiles of PRS), adjusted for age, smoking, years of education, parity and pre-pregnancy BMI. Error bars indicate 95% CI
Fig. 2
Fig. 2
Occurrence of glycaemic abnormalities (impaired fasting glucose, impaired glucose tolerance or type 2 diabetes) at 12 months postpartum among women in the control and intervention groups according to their genetic risk of type 2 diabetes (tertiles of PRS), adjusted for age, smoking, years of education, parity and pre-pregnancy BMI. Error bars indicate 95% CI

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