Abstract
Human hippocampal volume has been separately associated with single nucleotide polymorphisms (SNPs), DNA methylation and gene expression, but their causal relationships remain largely unknown. Here, we aimed at identifying the causal relationships of SNPs, DNA methylation, and gene expression that are associated with hippocampal volume by integrating cross-omics analyses with genome editing, overexpression and causality inference. Based on structural neuroimaging data and blood-derived genome, transcriptome and methylome data, we prioritized a possibly causal association across multiple molecular phenotypes: rs1053218 mutation leads to cg26741686 hypermethylation, thus leads to overactivation of the associated ANKRD37 gene expression in blood, a gene involving hypoxia, which may result in the reduction of human hippocampal volume. The possibly causal relationships from rs1053218 to cg26741686 methylation to ANKRD37 expression obtained from peripheral blood were replicated in human hippocampal tissue. To confirm causality, we performed CRISPR-based genome and epigenome-editing of rs1053218 homologous alleles and cg26741686 methylation in mouse neural stem cell differentiation models, and overexpressed ANKRD37 in mouse hippocampus. These in-vitro and in-vivo experiments confirmed that rs1053218 mutation caused cg26741686 hypermethylation and ANKRD37 overexpression, and cg26741686 hypermethylation favored ANKRD37 overexpression, and ANKRD37 overexpression reduced hippocampal volume. The pairwise relationships of rs1053218 with hippocampal volume, rs1053218 with cg26741686 methylation, cg26741686 methylation with ANKRD37 expression, and ANKRD37 expression with hippocampal volume could be replicated in an independent healthy young (n = 443) dataset and observed in elderly people (n = 194), and were more significant in patients with late-onset Alzheimer’s disease (n = 76). This study revealed a novel causal molecular association mechanism of ANKRD37 with human hippocampal volume, which may facilitate the design of prevention and treatment strategies for hippocampal impairment.
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Custom code that supports the findings of this study is available from the corresponding author upon request.
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Acknowledgements
This work was partly supported by the National Key Research and Development Program of China (Grant No. 2018YFC1314301), National Natural Science Foundation of China (Grant No. 82001797), Tianjin Applied Basic Research Diversified Investment Foundation (Grant No. 21JCYBJC01360), Tianjin Health Technology Project (Grant No. TJWJ2021QN002), Science&Technology Development Fund of Tianjin Education Commission for Higher Education (2019KJ195), National Key Research and Development Program of China (Grant No. 2017YFA0604401 and 2017YFA0504102), National Natural Science Foundation of China (Grant No. 82030053, 32070675 and 81801687), Natural Science Foundation of Tianjin City (Grant No. 19JCJQJC63600 for MJL and 18JCJQJC48200 for XW), Tianjin Key Medical Discipline (Specialty) Construction Project (Grant No. TJYXZDXK-001A). Further support was received by GS from the Horizon 2020 funded ERC Advanced Grant “STRATIFY” (Brain network-based stratification of reinforcement-related disorders) (695313), the National Institute of Health (NIH) (R01DA049238, A decentralized macro and micro gene-by-environment interaction analysis of substance use behavior and its brain biomarkers), the Human Brain Project (SGA3; 945539), and the Chinese National High-end Foreign Expert Recruitment Plan. Further support was provided by grants from the ANR (AAPG2019-GeBra), the Eranet Neuron (ANR-18-NEUR00002-01- ADORe). Healthy elderly controls and LOAD cases data collection and sharing for this project was funded by the Alzheimer’s Disease Neuroimaging Initiative (ADNI) (National Institutes of Health Grant U01 AG024904) and DOD ADNI (Department of Defense award number W81XWH-12-2-0012). ADNI is funded by the National Institute on Aging, the National Institute of Biomedical Imaging and Bioengineering, and through generous contributions from the following: AbbVie, Alzheimer’s Association; Alzheimer’s Drug Discovery Foundation; Araclon Biotech; BioClinica, Inc.; Biogen; Bristol-Myers Squibb Company; CereSpir, Inc.; Cogstate; Eisai Inc.; Elan Pharmaceuticals, Inc.; Eli Lilly and Company; EuroImmun; F. Hoffmann-La Roche Ltd and its affiliated company Genentech, Inc.; Fujirebio; GE Healthcare; IXICO Ltd.; Janssen Alzheimer Immunotherapy Research & Development, LLC.; Johnson & Johnson Pharmaceutical Research & Development LLC.; Lumosity; Lundbeck; Merck & Co., Inc.; Meso Scale Diagnostics, LLC.; NeuroRx Research; Neurotrack Technologies; Novartis Pharmaceuticals Corporation; Pfizer Inc.; Piramal Imaging; Servier; Takeda Pharmaceutical Company; and Transition Therapeutics. The Canadian Institutes of Health Research is providing funds to support ADNI clinical sites in Canada. Private sector contributions are facilitated by the Foundation for the National Institutes of Health (www.fnih.org). The grantee organization is the Northern California Institute for Research and Education, and the study is coordinated by the Alzheimer’s Therapeutic Research Institute at the University of Southern California. ADNI data are disseminated by the Laboratory for Neuro Imaging at the University of Southern California.
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JX, MJL, XW, and CY designed the study. JX, XX, YD, MJL, XW, and CY wrote the manuscript. JX, QL, XX and ZS analysed the data. All authors critically reviewed the manuscript. XS, NL, YH, XS, YH, WQ and SZ were the principal investigators. TB, HF, AG, PG, AH, RB, JM, EA, FN, TP, LP, SH, HW, PS and GS acquired the data.
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Xu, J., Xia, X., Li, Q. et al. A causal association of ANKRD37 with human hippocampal volume. Mol Psychiatry 27, 4432–4445 (2022). https://doi.org/10.1038/s41380-022-01800-7
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DOI: https://doi.org/10.1038/s41380-022-01800-7