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. 2023 Feb 13;146(2):492-506.
doi: 10.1093/brain/awac290.

Epigenetic and integrative cross-omics analyses of cerebral white matter hyperintensities on MRI

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Epigenetic and integrative cross-omics analyses of cerebral white matter hyperintensities on MRI

Yunju Yang et al. Brain. .

Abstract

Cerebral white matter hyperintensities on MRI are markers of cerebral small vessel disease, a major risk factor for dementia and stroke. Despite the successful identification of multiple genetic variants associated with this highly heritable condition, its genetic architecture remains incompletely understood. More specifically, the role of DNA methylation has received little attention. We investigated the association between white matter hyperintensity burden and DNA methylation in blood at ∼450 000 cytosine-phosphate-guanine (CpG) sites in 9732 middle-aged to older adults from 14 community-based studies. Single CpG and region-based association analyses were carried out. Functional annotation and integrative cross-omics analyses were performed to identify novel genes underlying the relationship between DNA methylation and white matter hyperintensities. We identified 12 single CpG and 46 region-based DNA methylation associations with white matter hyperintensity burden. Our top discovery single CpG, cg24202936 (P = 7.6 × 10-8), was associated with F2 expression in blood (P = 6.4 × 10-5) and co-localized with FOLH1 expression in brain (posterior probability = 0.75). Our top differentially methylated regions were in PRMT1 and in CCDC144NL-AS1, which were also represented in single CpG associations (cg17417856 and cg06809326, respectively). Through Mendelian randomization analyses cg06809326 was putatively associated with white matter hyperintensity burden (P = 0.03) and expression of CCDC144NL-AS1 possibly mediated this association. Differentially methylated region analysis, joint epigenetic association analysis and multi-omics co-localization analysis consistently identified a role of DNA methylation near SH3PXD2A, a locus previously identified in genome-wide association studies of white matter hyperintensities. Gene set enrichment analyses revealed functions of the identified DNA methylation loci in the blood-brain barrier and in the immune response. Integrative cross-omics analysis identified 19 key regulatory genes in two networks related to extracellular matrix organization, and lipid and lipoprotein metabolism. A drug-repositioning analysis indicated antihyperlipidaemic agents, more specifically peroxisome proliferator-activated receptor-alpha, as possible target drugs for white matter hyperintensities. Our epigenome-wide association study and integrative cross-omics analyses implicate novel genes influencing white matter hyperintensity burden, which converged on pathways related to the immune response and to a compromised blood-brain barrier possibly due to disrupted cell-cell and cell-extracellular matrix interactions. The results also suggest that antihyperlipidaemic therapy may contribute to lowering risk for white matter hyperintensities possibly through protection against blood-brain barrier disruption.

Keywords: blood–brain barrier dysfunction; cerebral small vessel disease; epigenome-wide association study; integrative cross-omics analysis; white matter hyperintensities.

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Figures

Figure 1
Figure 1
Overview of the study analytic scheme.
Figure 2
Figure 2
WMH-associated gene networks. WMH-associated genes based on multi-molecular evidence are organized around the 19 key driver genes. (A) WMH-associated network consisting of four subnetworks—extracellular matrix (ECM) organization (FMOD, COL3A1, SEPING1, SLC13A4 and ISLR); smooth muscle contraction (TAGLN); G-protein-coupled receptor ligand binding (GAL, ECEL1, ESR1 and NTS) and cytokine signalling in immune system (IFIT1 and RTP4). (B) WMH-associated network of lipid and lipoprotein metabolism (KNG1). Key drivers and associated gene networks identified in the Mergeomics analysis are coloured in orange. Neighbouring genes are grouped into networks and labelled in random colours.

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References

    1. Pantoni L. Cerebral small vessel disease: From pathogenesis and clinical characteristics to therapeutic challenges. Lancet Neurol. 2010;9:689–701. - PubMed
    1. Wardlaw JM, Benveniste H, Williams A. Cerebral vascular dysfunctions detected in human small vessel disease and implications for preclinical studies. Annu Rev Physiol. 2022;84:409–434. - PubMed
    1. Carmelli D, DeCarli C, Swan GE, et al. . Evidence for genetic variance in white matter hyperintensity volume in normal elderly male twins. Stroke. 1998;29:1177–1181. - PubMed
    1. Atwood LD, Wolf PA, Heard-Costa NL, et al. . Genetic variation in white matter hyperintensity volume in the Framingham Study. Stroke. 2004;35:1609–1613. - PubMed
    1. Kochunov P, Glahn D, Winkler A, et al. . Analysis of genetic variability and whole genome linkage of whole-brain, subcortical, and ependymal hyperintense white matter volume. Stroke. 2009;40:3685–3690. - PMC - PubMed

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