Two weeks of CBD changed DNA methylation patterns in mouse brain tissue
Subacute CBD exposure altered DNA methylation at over 3,300 sites in the mouse hippocampus, with changes concentrated in genes related to cell adhesion, neural development, and conditions like autism and schizophrenia.
Quick Facts
What This Study Found
CBD-treated mice had 3,323 differentially methylated loci with a slight skew toward global hypomethylation. Enrichment analysis found affected genes were involved in cell adhesion, dendritic spine development, and excitatory postsynaptic potential. Disease ontology showed overrepresentation in gene sets associated with autism spectrum disorder and schizophrenia.
Key Numbers
3,323 differentially methylated loci. Slight skew toward hypomethylation. 20 mg/kg CBD daily for 14 days. Enrichment in gene sets for autism, schizophrenia, and neural development.
How They Did This
12-week-old male mice received 20 mg/kg CBD or vehicle daily by oral administration for 14 days. Hippocampal tissue was analyzed using reduced-representation bisulfite sequencing (RRBS) to map genome-wide DNA methylation changes.
Why This Research Matters
If CBD changes DNA methylation patterns in the brain, this could be a mechanism underlying its behavioral effects and could have implications for long-term use, including potential risks and benefits that persist after CBD is discontinued.
The Bigger Picture
Epigenetic changes can persist long after the initial exposure. Understanding how CBD alters the epigenome could help explain its therapeutic effects and also raise questions about unintended consequences of chronic use.
What This Study Doesn't Tell Us
Animal study with only 14 days of exposure. Only male mice studied. Hippocampus was the only brain region examined. The biological significance of the methylation changes (whether they alter gene expression or behavior) was not tested.
Questions This Raises
- ?Do these methylation changes persist after CBD discontinuation?
- ?Do they translate into functional gene expression changes?
- ?Would human hippocampal tissue show similar epigenetic responses to CBD?
- ?Could these changes contribute to CBD's therapeutic or adverse effects?
Trust & Context
- Key Stat:
- 3,323 DNA methylation sites altered by 14 days of CBD
- Evidence Grade:
- Genome-wide epigenetic analysis with robust methodology, but single brain region, one sex, and no functional validation.
- Study Age:
- 2020 animal study. First genome-wide DNA methylation analysis of CBD exposure in adult brain.
- Original Title:
- Subacute cannabidiol alters genome-wide DNA methylation in adult mouse hippocampus.
- Published In:
- Environmental and molecular mutagenesis, 61(9), 890-900 (2020)
- Authors:
- Wanner, Nicole M(2), Colwell, Mathia(2), Drown, Chelsea(2), Faulk, Christopher
- Database ID:
- RTHC-02906
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
What is DNA methylation?
DNA methylation is a chemical modification that can turn genes on or off without changing the DNA sequence itself. It is one of the main ways the environment can influence gene activity, and changes can sometimes persist long-term.
Does this mean CBD changes genes permanently?
This study found CBD altered methylation patterns, but did not test whether changes persisted after stopping CBD or whether they affected gene expression. More research is needed to understand the duration and functional significance.
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Cite This Study
https://rethinkthc.com/research/RTHC-02906APA
Wanner, Nicole M; Colwell, Mathia; Drown, Chelsea; Faulk, Christopher. (2020). Subacute cannabidiol alters genome-wide DNA methylation in adult mouse hippocampus.. Environmental and molecular mutagenesis, 61(9), 890-900. https://doi.org/10.1002/em.22396
MLA
Wanner, Nicole M, et al. "Subacute cannabidiol alters genome-wide DNA methylation in adult mouse hippocampus.." Environmental and molecular mutagenesis, 2020. https://doi.org/10.1002/em.22396
RethinkTHC
RethinkTHC Research Database. "Subacute cannabidiol alters genome-wide DNA methylation in a..." RTHC-02906. Retrieved from https://rethinkthc.com/research/wanner-2020-subacute-cannabidiol-alters-genomewide
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.