Novel DNA methylation sites of glucose and insulin homeostasis: an integrative cross-omics analysis
By
Jun Liu,
Elena Carnero-Montoro,
Jenny van Dongen,
Samantha Lent,
Ivana Nedeljkovic,
Symen Ligthart,
Pei-Chien Tsai,
Tiphaine C. Martin,
Pooja R Mandaviya,
Rick Jansen,
Marjolein J. Peters,
Liesbeth Duijts,
Vincent W.V. Jaddoe,
Henning Tiemeier,
Janine F. Felix,
Audrey Y Chu,
Daniel Levy,
Shih-Jen Hwang,
Jan Bressler,
Rahul Gondalia,
Elias L. Salfati,
Christian Herder,
Bertha A. Hidalgo,
Toshiko Tanaka,
Ann Zenobia Moore,
Rozenn N. Lemaitre,
Min A. Jhun,
Jennifer A. Smith,
Nona Sotoodehnia,
Stefania Bandinelli,
Luigi Ferrucci,
Donna K. Arnett,
Harald Grallert,
Themistocles L. Assimes,
Lifang Hou,
Andrea Baccarelli,
Eric A Whitsel,
Ko Willems van Dijk,
Najaf Amin,
André G. Uitterlinden,
Eric J.G. Sijbrands,
Oscar H Franco,
Abbas Dehghan,
Timothy Spector,
Josée Dupuis,
Marie-France Hivert,
Jerome I. Rotter,
James B Meigs,
James S Pankow,
Joyce B.J. van Meurs,
Aaron Isaacs,
Dorret I Boomsma,
Jordana T. Bell,
Ayşe Demirkan,
Cornelia Van Duijn
Posted 18 Oct 2018
bioRxiv DOI: 10.1101/432070
(published DOI: 10.1038/s41467-019-10487-4)
Despite existing reports on differential DNA methylation in type 2 diabetes (T2D) and obesity, our understanding of the functional relevance of the phenomenon remains limited. Because obesity is the main risk factor for T2D and a driver of methylation from previous study, we aimed to explore the effect of DNA methylation in the early phases of T2D pathology while accounting for body mass index (BMI). We performed a blood-based epigenome-wide association study (EWAS) of fasting glucose and insulin among 4,808 non-diabetic European individuals and replicated the findings in an independent sample consisting of 11,750 non-diabetic subjects. We integrated blood-based in silico cross-omics databases comprising genomics, epigenomics and transcriptomics collected by BIOS project of the Biobanking and BioMolecular resources Research Infrastructure of the Netherlands (BBMRI-NL), the Meta-Analyses of Glucose and Insulin-related traits Consortium (MAGIC), the DIAbetes Genetics Replication And Meta-analysis (DIAGRAM) consortium, and the tissue-specific Genotype-Tissue Expression (GTEx) project. We identified and replicated nine novel differentially methylated sites in whole blood (P-value < 1.27 × 10-7): sites in LETM1, RBM20, IRS2, MAN2A2 genes and 1q25.3 region were associated with fasting insulin; sites in FCRL6, SLAMF1, APOBEC3H genes and 15q26.1 region were associated with fasting glucose. The association between SLAMF1, APOBEC3H and 15q26.1 methylation sites and glucose emerged only when accounted for BMI. Follow-up in silico cross-omics analyses indicate that the cis-acting meQTLs near SLAMF1 and SLAMF1 expression are involved in glucose level regulation. Moreover, our data suggest that differential methylation in FCRL6 may affect glucose level and the risk of T2D by regulating FCLR6 expression in the liver. In conclusion, the present study provided nine new DNA methylation sites associated with glycemia homeostasis and also provided new insights of glycemia related loci into the genetics, epigenetics and transcriptomics pathways based on the integration of cross-omics data in silico.
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