Abstract
Opioid use disorder is a highly heterogeneous disease driven by a variety of genetic and environmental risk factors which have yet to be fully elucidated. Opioid overdose, the most severe outcome of opioid use disorder, remains the leading cause of accidental death in the United States. We interrogated the effects of opioid overdose on the brain using ChIP-seq to quantify patterns of H3K27 acetylation in dorsolateral prefrontal cortical neurons isolated from 51 opioid-overdose cases and 51 accidental death controls. Among opioid cases, we observed global hypoacetylation and identified 388 putative enhancers consistently depleted for H3K27ac. Machine learning on H3K27ac patterns predicted case-control status with high accuracy. We focused on case-specific regulatory alterations, revealing 81,399 hypoacetylation events, uncovering vast inter-patient heterogeneity. We developed a strategy to decode this heterogeneity based on convergence analysis, which leveraged promoter-capture Hi-C to identify five genes over-burdened by alterations in their regulatory network or “plexus”: ASTN2, KCNMA1, DUSP4, GABBR2, ENOX1. These convergent loci are enriched for opioid use disorder risk genes and heritability for generalized anxiety, number of sexual partners, and years of education. Overall, our multi-pronged approach uncovers neurobiological aspects of opioid use disorder and captures genetic and environmental factors perpetuating the opioid epidemic.
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Data availability
ChIP and RNA seq data are available through dbgap accession number: phs002724.v1.p1.
Code availability
Code for the machine learning and VEL analyses are available through: https://github.com/corradin-lab/DLPFC-opioid-overdose. Convergence analysis code is available through: https://axiotl.com/ and https://convergence.axiotl.com/.
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Acknowledgements
We would like to express our gratitude to the families of the subjects used in this study. We would also like to acknowledge the teams of technicians at the Miami Brain Endowment Bank. This work was supported by NIH National Institute of Drug Abuse R01 DA043980.
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This work was conceptualized and written by PCS, SA, EOJ, DCM, DBH, RS, and OC. ChIP-seq and RNA-seq experiments were completed by SA, BSK, GBH, LC, KL, MI, HC, and CFB. Data analysis was performed by, OC, RS, ATH, BCQ, KL, and YS. Discussion and feedback were provided by CH and BEG.
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Peter Scacheri received compensation as a consultant for Kronos Bio.
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Corradin, O., Sallari, R., Hoang, A.T. et al. Convergence of case-specific epigenetic alterations identify a confluence of genetic vulnerabilities tied to opioid overdose. Mol Psychiatry 27, 2158–2170 (2022). https://doi.org/10.1038/s41380-022-01477-y
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DOI: https://doi.org/10.1038/s41380-022-01477-y
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