DNA methylation risk score for type 2 diabetes is associated with gestational diabetes

BACKGROUND: Gestational diabetes mellitus (GDM) and type 2 diabetes mellitus (T2DM) share many pathophysiological factors including genetics, but whether epigenetic marks are shared is unknown. We aimed to test whether a DNA methylation risk score (MRS) for T2DM was associated with GDM across ancestry and GDM criteria.METHODS: In two independent pregnancy cohorts, EPIPREG (n = 480) and EPIDG (n = 32), DNA methylation in peripheral blood leukocytes was measured at a gestational age of 28 ± 2. We constructed an MRS in EPIPREG and EPIDG based on CpG hits from a published epigenome-wide association study (EWAS) of T2DM.RESULTS: With mixed models logistic regression of EPIPREG and EPIDG, MRS for T2DM was associated with GDM: odd ratio (OR)[95% CI]: 1.3 [1.1-1.8], P = 0.002 for the unadjusted model, and 1.4 [1.1-1.7], P = 0.00014 for a model adjusted by age, pre-pregnant BMI, family history of diabetes and smoking status. Also, we found 6 CpGs through a meta-analysis (cg14020176, cg22650271, cg14870271, cg27243685, cg06378491, cg25130381) associated with GDM, and some of their methylation quantitative loci (mQTLs) were related to T2DM and GDM.CONCLUSION: For the first time, we show that DNA methylation marks for T2DM are also associated with GDM, suggesting shared epigenetic mechanisms between GDM and T2DM.

MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Endokrinologi och diabetes hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Endocrinology and Diabetes hsv//eng
Pregnancy
Female
Humans
Diabetes, Gestational/diagnosis
DNA Methylation
Diabetes Mellitus, Type 2/diagnosis
Epigenesis, Genetic
Risk Factors

Fragoso-Bargas, NicolasOslo university hospital(Swepub:lu)ni2035fr (författare)
Picón, María JoséHospitales Regional Universitario y Virgen de la Victoria de Málaga (författare)
Molina-Vega, MariaHospitales Regional Universitario y Virgen de la Victoria de Málaga (författare)
Jenum, Anne KarenUniversity of Oslo (författare)
Sletner, LineAkershus University Hospital (författare)
Lee-Ødegård, SindreUniversity of Oslo (författare)
Opsahl, Julia O.Haukeland University Hospital (författare)
Moen, Gunn-HelenUniversity of Bristol (författare)
Qvigstad, ElisabethOslo university hospital (författare)
Prasad, Rashmi BLund University,Lunds universitet,Translationell muskelforskning,Forskargrupper vid Lunds universitet,Translational Muscle Research,Lund University Research Groups,University of Helsinki(Swepub:lu)med-rpa (författare)
Birkeland, Kåre IOslo university hospital (författare)
Morcillo, SonsolesHospitales Regional Universitario y Virgen de la Victoria de Málaga (författare)
Sommer, ChristineOslo university hospital (författare)
University of GranadaOslo university hospital (creator_code:org_t)

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