THC and nicotine both altered DNA methylation at neurodevelopmental genes in rat sperm, including autism candidates
THC exposure changed DNA methylation in rat sperm at seven neurodevelopmental genes, with significant overlap to nicotine-induced changes and enrichment for autism candidate genes with bivalent chromatin.
Quick Facts
What This Study Found
THC exposure via oral gavage altered DNA methylation at seven neurodevelopmentally active genes in rat sperm. Pyrosequencing revealed majority overlap between THC and nicotine-induced methylation changes, suggesting shared vulnerability. Autism candidate genes were significantly enriched for bivalent chromatin structure, a configuration that may make these genes particularly susceptible to environmental disruption in sperm.
Key Numbers
7 neurodevelopmental genes differentially methylated by THC; majority overlap with nicotine effects; autism candidate genes enriched for bivalent chromatin.
How They Did This
Reduced representation bisulfite sequencing (RRBS) of sperm from rats exposed to THC via oral gavage, with pyrosequencing validation. Compared THC (oral and injection routes) and nicotine effects on neurodevelopmental gene methylation.
Why This Research Matters
This provides a molecular mechanism for how male cannabis use before conception could affect offspring brain development. The overlap with nicotine effects and enrichment for autism genes suggests a common epigenetic vulnerability at critical neurodevelopmental loci.
The Bigger Picture
The finding that bivalent chromatin makes autism candidate genes vulnerable to epigenetic disruption by multiple substances (THC, nicotine) suggests the risk is not substance-specific but reflects a structural vulnerability in sperm DNA at these critical loci.
What This Study Doesn't Tell Us
Rat model (sperm epigenetics may differ from humans); limited number of genes examined in detail; cannot determine if methylation changes persist through fertilization and embryonic development; does not assess offspring outcomes directly.
Questions This Raises
- ?Do these sperm methylation changes survive embryonic reprogramming?
- ?Is there a dose threshold below which THC does not affect sperm epigenetics?
Trust & Context
- Key Stat:
- 7 neurodevelopmental genes affected; autism genes enriched for bivalent chromatin
- Evidence Grade:
- Moderate: rigorous bisulfite sequencing in rats with validation, published in Scientific Reports, but animal model.
- Study Age:
- Published 2020.
- Original Title:
- Sperm DNA methylation altered by THC and nicotine: Vulnerability of neurodevelopmental genes with bivalent chromatin.
- Published In:
- Scientific reports, 10(1), 16022 (2020)
- Authors:
- Schrott, Rose(6), Rajavel, Maya, Acharya, Kelly(3), Huang, Zhiqing, Acharya, Chaitanya, Hawkey, Andrew, Pippen, Erica, Lyerly, H Kim, Levin, Edward D, Murphy, Susan K
- Database ID:
- RTHC-02832
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Can marijuana use by fathers affect their future children?
This rat study found THC altered DNA methylation at 7 neurodevelopmental genes in sperm, including autism candidate genes. Whether these changes persist through conception and affect offspring in humans is not yet known.
Why are autism genes particularly vulnerable?
Autism candidate genes are enriched for bivalent chromatin, a DNA structure that makes genes more susceptible to environmental disruption. Both THC and nicotine altered methylation at overlapping neurodevelopmental sites.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-02832APA
Schrott, Rose; Rajavel, Maya; Acharya, Kelly; Huang, Zhiqing; Acharya, Chaitanya; Hawkey, Andrew; Pippen, Erica; Lyerly, H Kim; Levin, Edward D; Murphy, Susan K. (2020). Sperm DNA methylation altered by THC and nicotine: Vulnerability of neurodevelopmental genes with bivalent chromatin.. Scientific reports, 10(1), 16022. https://doi.org/10.1038/s41598-020-72783-0
MLA
Schrott, Rose, et al. "Sperm DNA methylation altered by THC and nicotine: Vulnerability of neurodevelopmental genes with bivalent chromatin.." Scientific reports, 2020. https://doi.org/10.1038/s41598-020-72783-0
RethinkTHC
RethinkTHC Research Database. "Sperm DNA methylation altered by THC and nicotine: Vulnerabi..." RTHC-02832. Retrieved from https://rethinkthc.com/research/schrott-2020-sperm-dna-methylation-altered
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.