Epigenetic markers associated with metformin response and intolerance in drug-naïve patients with type 2 diabetes
Science Translational Medicine • 16 Sep 2020 • Vol 12, Issue 561 • DOI: 10.1126/scitranslmed.aaz1803
How to mete out metformin
Metformin is the most commonly used drug to treat type 2 diabetes (T2D), though not all patients respond to it, and still, others do not tolerate it. García-Calzón et al. analyzed genome-wide DNA methylation in the blood of drug-naïve patients who were recently diagnosed with T2D. They found that DNA methylation at specific loci associated with future metformin response or tolerance, respectively, across multiple cohorts. These epigenetic markers may have theranostic potential regarding which patients should receive metformin.
Abstract
Metformin is the first-line pharmacotherapy for managing type 2 diabetes (T2D). However, many patients with T2D do not respond to or tolerate metformin well. Currently, there are no phenotypes that successfully predict glycemic response to, or tolerance of, metformin. We explored whether blood-based epigenetic markers could discriminate metformin response and tolerance by analyzing genome-wide DNA methylation in drug-naïve patients with T2D at the time of their diagnosis. DNA methylation of 11 and 4 sites differed between glycemic responders/nonresponders and metformin-tolerant/intolerant patients, respectively, in discovery and replication cohorts. Greater methylation at these sites associated with a higher risk of not responding to or not tolerating metformin with odds ratios between 1.43 and 3.09 per 1-SD methylation increase. Methylation risk scores (MRSs) of the 11 identified sites differed between glycemic responders and nonresponders with areas under the curve (AUCs) of 0.80 to 0.98. MRSs of the 4 sites associated with future metformin intolerance generated AUCs of 0.85 to 0.93. Some of these blood-based methylation markers mirrored the epigenetic pattern in adipose tissue, a key tissue in diabetes pathogenesis, and genes to which these markers were annotated to had biological functions in hepatocytes that altered metformin-related phenotypes. Overall, we could discriminate between glycemic responders/nonresponders and participants tolerant/intolerant to metformin at diagnosis by measuring blood-based epigenetic markers in drug-naïve patients with T2D. This epigenetics-based tool may be further developed to help patients with T2D receive optimal therapy.
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Supplementary Material
Summary
Materials and Methods
Fig. S1. Flowchart and participant selection criteria of the ANDIS discovery cohort for metformin response.
Fig. S2. Flowchart and participant selection criteria of the ANDIS replication cohort for metformin response.
Fig. S3. Flowchart and selection criteria of ANDiU and OPTIMED participants for investigation of glycemic response to metformin therapy: “The European replication cohort for metformin response.”
Fig. S4. Combined MRSs discriminate between glycemic responders and nonresponders to metformin in drug-naïve participants with T2D from the ANDIS discovery and the European replication cohorts.
Fig. S5. Combined MRSs discriminate between glycemic responders and nonresponders to metformin in drug-naïve participants with T2D from the ANDIS discovery and the ANDIS replication cohorts.
Fig. S6. ROC curves for response and intolerance to metformin incorporating different clinical baseline phenotypes in all subjects from discovery and replication cohorts for metformin response and intolerance.
Fig. S7. ROC curves for response to metformin incorporating additional clinical baseline phenotypes in ANDIS participants from the discovery and replication cohorts for metformin response combined.
Fig. S8. Combined MRSs discriminate between tolerant and intolerant participants to metformin in drug-naïve participants with T2D from the ANDIS discovery and the European replication cohorts.
Fig. S9. Combined MRSs discriminate between tolerant and intolerant participants to metformin in drug-naïve participants with T2D from the ANDIS discovery and the ANDIS replication cohorts.
Fig. S10. Correlations between DNA methylation in blood and DNA methylation in adipose tissue (n = 28) from the same participant (monozygotic twin cohort).
Fig. S11. In vitro methylation of the SAP130 promoter resulted in decreased transcriptional activity.
Table S1. Clinical characteristics of the full discovery and replication cohorts for metformin response including drug-naïve and newly diagnosed participants with T2D from the ANDIS cohort.
Table S2. Clinical characteristics of case-control discovery and replication cohorts including patients who fulfill the criteria of being glycemic responders and nonresponders to metformin therapy.
Table S3. CpG sites with a significant association (FDR < 5%) between DNA methylation in whole blood before taking metformin and the change in HbA1c after ~1.5 years on metformin in drug-naïve participants with T2D from the discovery cohort (n = 63) (Excel).
Table S4. Comparison of the 2577 significant CpG sites (FDR < 5%) with an association between DNA methylation and the ∆HbA1c after ~1.5 years in drug-naïve participants with T2D from the discovery cohort, with two other linear models (Excel).
Table S5. CpG sites with DNA methylation associated with the change in HbA1c (ΔHbA1c) in both the discovery cohort and in the ANDIS replication cohort for metformin response (Excel).
Table S6. CpG sites exhibiting differences in DNA methylation in whole blood between glycemic responders (n = 26) and nonresponders (n = 21) to metformin therapy in drug-naïve participants with T2D from the discovery cohort (Excel).
Table S7. Comparison of the 7916 significant CpG sites (FDR < 5%) between metformin responders and nonresponders in drug-naïve participants with T2D from the discovery cohort, with three other linear models (Excel).
Table S8. Methylated CpG sites associated with response to metformin in the discovery cohort and in the ANDIS replication cohort for metformin response (Excel).
Table S9. Methylated CpG sites associated with response to metformin in the discovery cohort and in the European replication cohort for metformin response (Excel).
Table S10. Methylated CpG sites associated with response to metformin in the discovery cohort and in both the ANDIS and the European replication cohorts for metformin response (Excel).
Table S11. Clinical characteristics of drug-naïve and newly diagnosed patients with T2D included in the metformin intolerance discovery and replication cohorts.
Table S12. CpG sites exhibiting differences in DNA methylation in whole blood between metformin-intolerant (n = 17) and metformin-tolerant (n = 66) drug-naïve participants with T2D from the discovery cohort (Excel).
Table S13. Comparison of the 9676 significant CpG sites (FDR < 5%) between metformin-tolerant and metformin-intolerant drug-naïve participants with T2D from the discovery cohort, with two other linear models (Excel).
Table S14. CpG sites with DNA methylation associated with intolerance to metformin in the discovery cohort and in the ANDIS replication cohort for metformin intolerance (Excel).
Table S15. CpG sites with DNA methylation associated with intolerance to metformin in the discovery cohort and in the European replication cohort for metformin intolerance (Excel).
Table S16. CpG sites with DNA methylation associated with intolerance to metformin in the discovery cohort and in both the ANDIS and the European replication cohorts for metformin intolerance (Excel).
Table S17. Assessing discrimination between glycemic responders and nonresponders to metformin using SNPs and MRSs associated with metformin response.
Table S18. Assessing discrimination between tolerant and intolerant participants to metformin using SNPs and MRSs associated with metformin intolerance.
Table S19. Clinical characteristics of all study participants in the monozygotic twin cohort (MZ).
Table S20. Available data from the monozygotic twin cohort used for cross-tissue methylation analysis in human tissues in the present study.
Table S21. Promoter sequence upstream of SAP130 inserted into the CpG-free firefly luciferase reporter vector (pCpGL-basic) and used for luciferase experiments.
Data file S1. Tables S3 to S10 and S12 to S16 (Excel).
Data file S2. Raw data from figures (Excel).
Resources
File (aaz1803_data_file_s1.xlsx)
File (aaz1803_data_file_s2.xlsx)
File (aaz1803_sm.pdf)
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Science Translational Medicine
Volume 12 | Issue 561
September 2020
September 2020
Copyright
Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
This is an article distributed under the terms of the Science Journals Default License.
Submission history
Received: 20 August 2019
Accepted: 24 August 2020
Acknowledgments
We thank Y. Wessman, M. Sterner, E. Nilsson, the SCIBLU genomics facility at Lund University and the Genome Database of the Latvian Population for providing biological material and data for the OPTIMED cohort. We thank E. Pearson for help in the design of statistical models. Funding: This work was supported by grants from the Novo Nordisk Foundation, Swedish Research Council, Region Skåne (ALF), ERC-Co grant (PAINTBOX, no. 725840), H2020-Marie Skłodowska-Curie grant agreement no. 706081 (EpiHope), The Swedish Heart Lung Foundation, EFSD, Exodiab, Swedish Foundation for Strategic Research for IRC15-0067, Swedish Diabetes Foundation, Albert Påhlsson Foundation, and ERC-CoG-2015_681742_NASCENT. The group of Swedish twins was recruited from the Swedish Twin Registry, which is supported by grants from the Swedish Research Council. The funders had no role in study design, data collection, analysis and interpretation, decision to publish, or preparation of the manuscript. Author contributions: S.G.-C., L.G., E.A., and C.L. contributed to the conception of the work. S.G.-C., S.K., P.W.F., M.M., M.U., I.E., J.P., A.V., L.G., J.K., E.A., and C.L. contributed to the data collection. S.G.-C., A.P., M.M., S.K., K.B., E.A., and P.V. contributed to the data analysis. S.G.-C., S.K., and K.B. performed experiments. S.G.-C. and C.L. drafted the article. All authors contributed to the interpretation of data and critical revision of the article. All authors gave final approval of the version to be published. S.G.-C. and C.L. had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. S.G.-C. and C.L. are guarantors. Competing interests: S.G.-C., A.P., and C.L. have a pending patent (“DNA methylation level of specific CpG sites for prediction of glycemic response and tolerance to metformin treatment in type 2 diabetic patients,” P5066SE00) on using the degree of DNA methylation of specific sites for prediction of glycemic response and tolerance to metformin treatment in patients with T2D. P.W.F. has received research funding from Boehringer Ingelheim, Eli Lilly, Janssen, Novo Nordisk A/S, Sanofi Aventis, and Servier; received consulting fees from Eli Lilly, Novo Nordisk, and Zoe Global Ltd.; and has stock options in Zoe Global Ltd. P.V. works now at the pharmaceutical company AstraZeneca. The other authors declare that they have no competing interests. Data and materials availability: All data used to generate figures 3, 4, 5, and 6 are available in data file S2. DNA methylation data are deposited at the LUDC repository (www.ludc.lu.se/resources/repository) under the following accession numbers and are available upon request: LUDC2020.08.1 (discovery cohort for metformin response), LUDC2020.08.2 (ANDIS replication cohort for metformin response), LUDC2020.08.3 (discovery cohort for metformin response case control), LUDC2020.08.4 (ANDIS replication cohort for metformin response case control), LUDC2020.08.5 (European replication cohort for metformin response case control), LUDC2020.08.6 (discovery cohort for metformin intolerance), LUDC2020.08.7 (ANDIS replication cohort for metformin intolerance), and LUDC2020.08.8 (European replication cohort for metformin intolerance).
Authors
Funding Information
H2020 European Research Council: 725840
European Research Council: CoG-2015_681742_NASCENT
Swedish Foundation for Strategic Research: IRC15-0067
Excellence of Diabetes Research in Sweden (Exodiab)
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