Abstract
The relationship between genetic variation and gene expression in brain cell types and subtypes remains understudied. Here, we generated single-nucleus RNA sequencing data from the neocortex of 424 individuals of advanced age; we assessed the effect of genetic variants on RNA expression in cis (cis-expression quantitative trait loci) for seven cell types and 64 cell subtypes using 1.5 million transcriptomes. This effort identified 10,004 eGenes at the cell type level and 8,099 eGenes at the cell subtype level. Many eGenes are only detected within cell subtypes. A new variant influences APOE expression only in microglia and is associated with greater cerebral amyloid angiopathy but not Alzheimer’s disease pathology, after adjusting for APOEε4, providing mechanistic insights into both pathologies. Furthermore, only a TMEM106B variant affects the proportion of cell subtypes. Integration of these results with genome-wide association studies highlighted the targeted cell type and probable causal gene within Alzheimer’s disease, schizophrenia, educational attainment and Parkinson’s disease loci.
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Data availability
Raw sequence and processed data of single-nucleus RNA-seq are available at Synapse (https://www.synapse.org/#!Synapse:syn31512863). To preserve the anonymity of study participants, access to the datasets is restricted and requires a data use certificate (DUC) to be submitted. To submit a DUC, please see https://adknowledgeportal.synapse.org/Data%20Access. Cell (sub)type annotation and cell (sub)type-level eQTL summary statistics are available at Synapse (https://doi.org/10.7303/syn52335732). The cell type-level eQTLs of this study are also available from https://vmenon.shinyapps.io/rosmap_snrnaseq_eqtl/. The VCF files of the WGS are available at Synapse (https://www.synapse.org/#!Synapse:syn11724057). The reference human genome GRCh37 used for WGS variant calling is available from the European Molecular Biology Laboratory-European Bioinformatics Institute (https://ftp.1000genomes.ebi.ac.uk/vol1/ftp/technical/reference/human_g1k_v37.fasta.gz).
Code availability
All software used in the study is publicly available as described in the Methods and Reporting Summary. The custom code to prepare the pseudobulk gene expression and mapping cis-eQTL can be found at Zenodo (https://zenodo.org/records/10472216) and GitHub (https://github.com/masashi-CU/snuc-eQTL).
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Acknowledgements
We thank all the participants of the ROS/MAP study for their participation and generous donation of brains. This work was funded by NIH grant nos. U01AG061356 (P.L.D.J./D.A.B.), RF1AG057473 (P.L.D.J./D.A.B.) and U01AG046152 (P.L.D.J./D.A.B.) as part of the AMP-AD consortium, as well as NIH grant nos. R01AG066831 (V.M.), K25DK128563 (A.K.) and U01AG072572 (P.L.D.J./St George-Hyslop).
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V.M. and P.L.D.J. conceptualized the study. M.F., Z.G., L.Z., C.M., C.C.W., B.N., G.S.G., O.R.-R., D.P., L.A.-Z., H.L., R.V.P., A.K., B.N.V., K.K., C.J.Y., H.-U.K., G.W., A.R., N.H., J.A.S., Y.W., T.Y.-P., S.M., D.A.B., V.M. and P.L.D.J. carried out the investigation. D.A.B., V.M. and P.L.D.J. acquired the funding. V.M. and P.L.D.J. supervised the study. M.F., Z.G., L.Z. and P.L.D.J. wrote the original manuscript draft. M.F., C.C.W., B.N., G.S.G., K.K., C.J.Y., H.-U.K., T.Y.-P., D.A.B. and P.L.D.J. reviewed and edited the manuscript draft.
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A.R. is a cofounder and equity holder of Celsius Therapeutics, is an equity holder in Immunitas and was a scientific advisory board member of Thermo Fisher Scientific, Syros Pharmaceuticals, Neogene Therapeutics and Asimov until 31 July 2020. Since 1 August 2020, A.R. is an employee of Genentech with equity in Roche. O.R.-R. has been an employee of Genentech since 19 October 2020. She has given many lectures on the subject of single-cell genomics to a wide variety of audiences and, in some cases, received remuneration to cover time and costs. O.R.-R. and A.R. are coinventors on patent applications filed at the Broad Institute of MIT and Harvard related to single-cell genomics. Since 3 May 2021, D.P. is an employee of Genentech with equity in Roche. The other authors declare no competing interests.
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Fujita, M., Gao, Z., Zeng, L. et al. Cell subtype-specific effects of genetic variation in the Alzheimer’s disease brain. Nat Genet 56, 605–614 (2024). https://doi.org/10.1038/s41588-024-01685-y
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DOI: https://doi.org/10.1038/s41588-024-01685-y