Cited by 75Alzheimer's disease research and treatmentsGenomics and Chromatin DynamicsGenetic Associations and Epidemiology

Enhancer variants associated with Alzheimer’s disease affect gene expression via chromatin looping

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Kikuchi, Masataka, Hara, Norikazu, Hasegawa, Mai, Miyashita, Akinori, Kuwano, Ryozo, Ikeuchi, Takeshi, Nakaya, Akihiro·2019·BMC Medical Genomics

Published version of a preprint

Abstract

BACKGROUND: Genome-wide association studies (GWASs) have identified single-nucleotide polymorphisms (SNPs) that may be genetic factors underlying Alzheimer's disease (AD). However, how these AD-associated SNPs (AD SNPs) contribute to the pathogenesis of this disease is poorly understood because most of them are located in non-coding regions, such as introns and intergenic regions. Previous studies reported that some disease-associated SNPs affect regulatory elements including enhancers. We hypothesized that non-coding AD SNPs are located in enhancers and affect gene expression levels via chromatin loops. METHODS: from the GWAS catalog database. Of these, we selected 392 SNPs within non-coding regions. Next, we checked whether those non-coding AD SNPs were located in enhancers that typically regulate gene expression levels using publicly available data for enhancers that were predicted in 127 human tissues or cell types. We sought expression quantitative trait locus (eQTL) genes affected by non-coding AD SNPs within enhancers because enhancers are regulatory elements that influence the gene expression levels. To elucidate how the non-coding AD SNPs within enhancers affect the gene expression levels, we identified chromatin-chromatin interactions by Hi-C experiments. RESULTS: We report the following findings: (1) nearly 30% of non-coding AD SNPs are located in enhancers; (2) eQTL genes affected by non-coding AD SNPs within enhancers are associated with amyloid beta clearance, synaptic transmission, and immune responses; (3) 95% of the AD SNPs located in enhancers co-localize with their eQTL genes in topologically associating domains suggesting that regulation may occur through chromatin higher-order structures; (4) rs1476679 spatially contacts the promoters of eQTL genes via CTCF-CTCF interactions; (5) the effect of other AD SNPs such as rs7364180 is likely to be, at least in part, indirect through regulation of transcription factors that in turn regulate AD associated genes. CONCLUSION: Our results suggest that non-coding AD SNPs may affect the function of enhancers thereby influencing the expression levels of surrounding or distant genes via chromatin loops. This result may explain how some non-coding AD SNPs contribute to AD pathogenesis.

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  1. [50]Tang Z Luo OJ Li X Zheng M Zhu JJ Szalaj P CTCF-mediated human 3D genome architecture reveals chromatin topology for transcription Cell 2015 163 1611 1627 10.1016/j.cell.2015.11.024 26686651 PMC4734140 · DOI · Paper page

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Authors
Kikuchi, M., Hara, N., Hasegawa, M., Miyashita, A., Kuwano, R., Ikeuchi, T., & Nakaya, A.
Affiliations
  • The University of Osaka (JP)
  • Brain Research Institute, Niigata University (JP)
Corresponding author
  • Kikuchi, Masataka
  • Nakaya, Akihiro
Venue
BMC Medical Genomics
Published
2019-09-09
Volume
12
Issue
1
Pages
128-128
ISSN
1755-8794 (ISSN-L)
OpenAlex
W2972895026
Cited by
74
References
72
Citations by year
2026: 3 · 2025: 12 · 2024: 6 · 2023: 11 · 2022: 15 · 2021: 15 · 2020: 12
FWCI
7.20
Type
journal article
Language
en
Open access
Locations
  • BMC Medical Genomics (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • Japan Science and Technology Agency (16K07222, 17K15049, 22129004, 24310144, 24651221)
  • Japan Agency for Medical Research and Development (An Integrated Database of Clinical and Genomic Information, A Research and Development Grants for Dementia)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
Keywords
Alzheimer's disease, enhancer variants, chromatin looping, topologically associating domains, expression quantitative trait loci, amyloid-beta clearance, synaptic transmission, immune response, transcription factor regulation, enhancer-promoter interactions
MeSH terms
CCCTC-Binding Factor, Alzheimer Disease, Binding Sites, Chromatin, Enhancer Elements, Genetic, Gene Expression Regulation, Humans, Nucleic Acid Conformation, Genetic Variation, Polymorphism, Single Nucleotide, Quantitative Trait Loci

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