PreprintCited by 11Genetic Associations and EpidemiologySingle-cell and spatial transcriptomicsGenomics and Chromatin Dynamics

SingleBrain: A Meta-Analysis of Single-Nucleus eQTLs Linking Genetic Risk to Brain Disorders

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Jang, Beomjin, Kailash, BP, Tokolyi, Alex, Cuddleston, Winston H., Ravi, Ashvin, Jung, Sang-Hyuk, Naito, Tatsuhiko, Kim, Beomsu +9 more·2025·medRxiv

Abstract

Most genetic risk variants for neurological diseases are located in non-coding regulatory regions, where they may often act as expression quantitative trait loci (eQTLs), modulating gene expression and influencing disease susceptibility. However, eQTL studies in bulk brain tissue or specific cell types lack the resolution to capture the brain’s cellular diversity. Single-nucleus RNA sequencing (snRNA-seq) offers high-resolution mapping of eQTLs across diverse brain cell types. Here, we performed a meta-analysis, “SingleBrain,” integrating publicly available snRNA-seq and genotype data from four cohorts, totaling 5.8 million nuclei from 983 individuals. We mapped cis -eQTLs across major brain cell types and subtypes and employed statistical colocalization and Mendelian randomization to identify genes mediating neurological disease risk. We observed up to a 10-fold increase in cis -eQTLs compared to previous studies and uncovered novel cell type-specific genes linked to Alzheimer’s disease, Parkinson’s disease, and schizophrenia that were previously undetectable in bulk tissue analyses. Additionally, we prioritized putative causal variants for each locus through fine-mapping and integration with cell type-specific enhancer and promoter regulatory elements. SingleBrain represents a comprehensive single-cell eQTL resource, advancing insights into the genetic regulation of brain disorders.

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  • The directional effect of the AD risk allele of rs10792832 on PICALM expression was consistent with other hMG eQTL findings.

    “The directional effect of the AD risk allele of rs10792832 on PICALM expression was consistent with other hMG eQTL findings8,9,25.”

    From PICALM Alzheimer’s risk allele causes aberrant lipid droplets in microglia (2025) · cites this paper as [25]

    The Results section discusses AD-associated microglial eQTLs, but the passages found do not mention rs10792832 or PICALM. Searches for both terms and for a directional comparison with other human microglial eQTL findings found no passage that addresses the claim. (LLM, conf=0.72)

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Authors
Jang, B., Kailash, B., Tokolyi, A., Cuddleston, W. H., Ravi, A., Jung, S.-H., Naito, T., Kim, B., Kim, M. S., Cho, M., Park, M.-S., Rosen, M., Blanchard, J., Humphrey, J., Knowles, D. A., Won, H.-H., & Raj, T.
Affiliations
  • Samsung Medical Center (KR)
  • New York Genome Center (US)
  • Icahn School of Medicine at Mount Sinai (US)
  • University of California, San Francisco (US)
  • Kangwon National University (KR)
  • Broad Institute (US)
Corresponding author
  • Won, Hong-Hee
  • Raj, Towfique
Venue
medRxiv
Publisher
openRxiv
Published
2025-03-07
OpenAlex
W4408216097
Cited by
11
References
55
Citations by year
2026: 6 · 2025: 5
Type
posted content
Language
en
Open access
Locations
  • medRxiv (acceptedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (submittedVersion, cc-by-nc-nd)
  • PubMed Central (submittedVersion, cc-by-nc-nd)
Funders
  • Georgia Clinical and Translational Science Alliance (UL1TR004419)
  • National Research Foundation
  • National Research Foundation of Korea (RS-2023-00223277)
  • Ministry of Science and ICT, South Korea (RS‐2023‐00223277)
  • National Institutes of Health (1r21ag063130-01a1, 1s10od026880-01, 1rf1ag065926-01a1, 1r56ag055824-01a1, 1s10od030463-01, AG066514, NIA R01-AG054005, RF1-AG065926, UL1TR004419)
  • Samsung
  • National Institute on Aging (U01AG058635, R21-AG063130, U01AG068880, NIA R21-AG063130, R01AG054005, R56- AG055824, RF1-AG065926, P30AG066514)
  • National Institute of Neurological Disorders and Stroke (U54NS123743, R01NS116006)
  • National Center for Advancing Translational Sciences (S10OD026880, S10OD030463)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Single-cell and spatial transcriptomics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
single-nucleus RNA sequencing, expression quantitative trait loci, cis-eQTL, brain cell types, Alzheimer's disease, Parkinson's disease, schizophrenia, non-coding regulatory variants, colocalization, Mendelian randomization, fine mapping

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