Blood DNA methylomic signatures associated with CSF biomarkers of Alzheimer's disease in the EMIF‐AD study

Author:

Smith Rebecca G.1,Pishva Ehsan12,Kouhsar Morteza1,Imm Jennifer1,Dobricic Valerija3,Johannsen Peter4,Wittig Michael5,Franke Andre5,Vandenberghe Rik6,Schaeverbeke Jolien6,Freund‐Levi Yvonne789,Frölich Lutz10,Scheltens Philip11,Teunissen Charlotte E.12,Frisoni Giovanni13,Blin Olivier14,Richardson Jill C.15,Bordet Régis16,Engelborghs Sebastiaan1718,de Roeck Ellen17,Martinez‐Lage Pablo19,Altuna Miren19,Tainta Mikel19,Lleó Alberto20,Sala Isabel20,Popp Julius21,Peyratout Gwendoline22,Winchester Laura23,Nevado‐Holgado Alejo23,Verhey Frans2,Tsolaki Magda24,Andreasson Ulf25,Blennow Kaj252627,Zetterberg Henrik2528293031,Streffer Johannes32,Vos Stephanie J. B.2,Lovestone Simon2233,Visser Pieter Jelle211,Bertram Lars3,Lunnon Katie1ORCID

Affiliation:

1. Department of Clinical and Biomedical Sciences Faculty of Health and Life Sciences University of Exeter Exeter Devon UK

2. Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNs), Faculty of Health, Medicine and Life Sciences (FHML) Maastricht University Maastricht The Netherlands

3. Lübeck Interdisciplinary Platform for Genome Analytics (LIGA) University of Lübeck Lübeck Germany

4. Danish Dementia Research Centre, Rigshospitalet Copenhagen Denmark

5. Institute of Clinical Molecular Biology Christian‐Albrechts‐University of Kiel Kiel Germany

6. Laboratory for Cognitive Neurology KU Leuven, Leuven Brain Institute Leuven Belgium

7. Department of Clinical Science and Education Södersjukhuset, Karolinska Institutet Stockholm Sweden

8. School of Medical Sciences Örebro University Örebro Sweden

9. Department of Geriatrics Södertälje Hospital Södertälje Sweden

10. Department of Geriatric Psychiatry Central Institut of Mental Health Medical Faculty Mannheim/Heidelberg University Mannheim Germany

11. Alzheimer Center Amsterdam, Department of Neurology, Amsterdam Neuroscience Vrije Universiteit Amsterdam, Amsterdam UMC Amsterdam The Netherlands

12. Neurochemistry Laboratory Department of Laboratory Medicine, Amsterdam Neuroscience Vrije Universiteit Amsterdam, Amsterdam UMC Amsterdam The Netherlands

13. Memory center Geneva University and University Hospitals; on behalf of the AMYPAD consortium Geneva Switzerland

14. Aix‐Marseille University‐CNRS Marseille France

15. Neuroscience Therapeutic Area, GlaxoSmithKline R&D Stevenage Hertfordshire UK

16. Université de Lille Lille Cedex France

17. Department of Biomedical Sciences University of Antwerp Antwerp Belgium

18. Neuroprotection & Neuromodulation (NEUR) Research Group, Center for Neurosciences (C4N) Vrije Universiteit Brussel (VUB), Jette Brussels Belgium

19. Center for Research and Advanced Therapies Fundación CITA‐Alzhéimer Fundazioa San Sebastian Gipuzkoa Spain

20. Servicio de Neurología, Centre of Biomedical Investigation Network for Neurodegenerative Diseases (CIBERNED) Hospital Sant Pau Barcelona Spain

21. University Hospital of Psychiatry Zürich, University of Zürich Zürich Switzerland

22. Department of Psychiatry University Hospital of Lausanne (CHUV) Lausanne Switzerland

23. Department of Psychiatry University of Oxford Oxford UK

24. 1st Department of Neurology School of Medicine Laboratory of Neurodegenerative Diseases Center for Interdisciplinary Research and Innovation Aristotle University of Thessaloniki, and Alzheimer Hellas Thessaloniki Greece

25. Institute of Neuroscience and Physiology Department of Psychiatry and Neurochemistry The Sahlgrenska Academy at University of Gothenburg Göteborg Sweden

26. Paris Brain Institute ICM, Pitié‐Salpêtrière Hospital Sorbonne University Paris France

27. Neurodegenerative Disorder Research Center Division of Life Sciences and Medicine and Department of Neurology Institute on Aging and Brain Disorders University of Science and Technology of China and First Affiliated Hospital of USTC Hefei PR China

28. Department of Neurodegenerative Disease UCL Institute of Neurology Queen Square London UK

29. UK Dementia Research Institute at UCL London UK

30. Hong Kong Center for Neurodegenerative Diseases, N.T. Shatin Hong Kong China

31. Wisconsin Alzheimer's Disease Research Center University of Wisconsin School of Medicine and Public Health, University of Wisconsin‐Madison Madison Wisconsin USA

32. Translational Medicine Neuroscience UCB Biopharma SRL Brussels Belgium

33. Currently at: Johnson & Johnson Innovative Medicines Beerse Belgium

Abstract

AbstractINTRODUCTIONWe investigated blood DNA methylation patterns associated with 15 well‐established cerebrospinal fluid (CSF) biomarkers of Alzheimer's disease (AD) pathophysiology, neuroinflammation, and neurodegeneration.METHODSWe assessed DNA methylation in 885 blood samples from the European Medical Information Framework for Alzheimer's Disease (EMIF‐AD) study using the EPIC array.RESULTSWe identified Bonferroni‐significant differential methylation associated with CSF YKL‐40 (five loci) and neurofilament light chain (NfL; seven loci) levels, with two of the loci associated with CSF YKL‐40 levels correlating with plasma YKL‐40 levels. A co‐localization analysis showed shared genetic variants underlying YKL‐40 DNA methylation and CSF protein levels, with evidence that DNA methylation mediates the association between genotype and protein levels. Weighted gene correlation network analysis identified two modules of co‐methylated loci correlated with several amyloid measures and enriched in pathways associated with lipoproteins and development.DISCUSSIONWe conducted the most comprehensive epigenome‐wide association study (EWAS) of AD‐relevant CSF biomarkers to date. Future work should explore the relationship between YKL‐40 genotype, DNA methylation, and protein levels in the brain.Highlights Blood DNA methylation was assessed in the EMIF‐AD MBD study. Epigenome‐wide association studies (EWASs) were performed for 15 Alzheimer's disease (AD)–relevant cerebrospinal fluid (CSF) biomarker measures. Five Bonferroni‐significant loci were associated with YKL‐40 levels and seven with neurofilament light chain (NfL). DNA methylation in YKL‐40 co‐localized with previously reported genetic variation. DNA methylation potentially mediates the effect of single‐nucleotide polymorphisms (SNPs) in YKL‐40 on CSF protein levels.

Funder

Alzheimer's Society

National Institute on Aging

Vlaamse regering

Fonds Wetenschappelijk Onderzoek

Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

Vetenskapsrådet

Familjen Erling-Perssons Stiftelse

Stiftelsen för Gamla Tjänarinnor

Hjärnfonden

UK Dementia Research Institute

Alzheimer's Association

Publisher

Wiley

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