Quitting Cannabis Reverses DNA Changes in Sperm
Cannabis-associated changes in sperm DNA methylation, particularly at genes involved in heart and brain development, were significantly diminished after 77 days of abstinence.
Quick Facts
What This Study Found
Whole-genome bisulfite sequencing identified 163 CpG sites with significantly altered DNA methylation in cannabis users' sperm, concentrated at genes involved in cardiogenesis and neurodevelopment, and many of these changes were reversed after one spermatogenic cycle (77 days) of abstinence.
Key Numbers
163 CpG sites with significantly different methylation (p<10^-9); affected genes enriched for development, cardiogenesis, and neurodevelopment pathways; 77-day abstinence period (one spermatogenic cycle); significant reduction in methylation differences after abstinence.
How They Did This
Prospective cohort comparing sperm DNA methylation between cannabis users and non-user controls at baseline and after a 77-day abstinence period, using whole-genome bisulfite sequencing.
Why This Research Matters
This is the first evidence that cannabis-related epigenetic changes in sperm are reversible, suggesting that men planning to conceive could potentially reduce risks by abstaining for at least one full sperm development cycle.
The Bigger Picture
As epigenetic inheritance through sperm becomes better understood, the finding that cannabis effects are reversible provides a practical timeline for men who want to minimize potential reproductive risks.
What This Study Doesn't Tell Us
Small sample size; controlled abstinence period may not reflect real-world behavior; long-term offspring health effects of these epigenetic changes remain unknown; functional significance of methylation changes not established.
Questions This Raises
- ?Do these reversed epigenetic changes translate to measurable differences in offspring health outcomes?
- ?Is 77 days sufficient for complete reversal, or do some changes persist longer?
Trust & Context
- Key Stat:
- 77 days of cannabis abstinence significantly reduced sperm DNA methylation changes at developmental genes
- Evidence Grade:
- Small prospective study using advanced genomic methods provides preliminary evidence for reversibility of epigenetic changes.
- Study Age:
- Published in 2021.
- Original Title:
- Refraining from use diminishes cannabis-associated epigenetic changes in human sperm.
- Published In:
- Environmental epigenetics, 7(1), dvab009 (2021)
- Authors:
- Schrott, Rose(6), Murphy, Susan K(11), Modliszewski, Jennifer L(2), King, Dillon E, Hill, Bendu, Itchon-Ramos, Nilda, Raburn, Douglas, Price, Thomas, Levin, Edward D, Vandrey, Ryan, Corcoran, David L, Kollins, Scott H, Mitchell, John T
- Database ID:
- RTHC-03503
Evidence Hierarchy
Enrolls participants and follows them forward in time.
What do these levels mean? →Frequently Asked Questions
Does cannabis permanently change sperm DNA?
This study suggests not. After 77 days of abstinence (one full sperm development cycle), many of the cannabis-associated DNA methylation changes were significantly reduced.
Which genes were affected by cannabis use?
The 163 altered sites were concentrated at genes involved in early development, particularly heart formation and brain development, raising questions about potential effects on offspring.
Read More on RethinkTHC
- cannabis-cardiovascular-heart-risk-stroke
- cannabis-heart-cardiovascular-risk
- coughing-up-stuff-after-quitting-weed
- lung-recovery-after-quitting-smoking-weed
- lung-recovery-quitting-weed
- quitting-weed-female-hormones
- quitting-weed-weight-gain-loss-diet-appetite
- sex-after-quitting-weed
- weed-DUI-driving-impaired-cannabis-laws
- weed-acne-skin
- weed-fertility-sperm
- weed-gut-digestion-problems
- weed-heart-health
- weed-testosterone-levels
Cite This Study
https://rethinkthc.com/research/RTHC-03503APA
Schrott, Rose; Murphy, Susan K; Modliszewski, Jennifer L; King, Dillon E; Hill, Bendu; Itchon-Ramos, Nilda; Raburn, Douglas; Price, Thomas; Levin, Edward D; Vandrey, Ryan; Corcoran, David L; Kollins, Scott H; Mitchell, John T. (2021). Refraining from use diminishes cannabis-associated epigenetic changes in human sperm.. Environmental epigenetics, 7(1), dvab009. https://doi.org/10.1093/eep/dvab009
MLA
Schrott, Rose, et al. "Refraining from use diminishes cannabis-associated epigenetic changes in human sperm.." Environmental epigenetics, 2021. https://doi.org/10.1093/eep/dvab009
RethinkTHC
RethinkTHC Research Database. "Refraining from use diminishes cannabis-associated epigeneti..." RTHC-03503. Retrieved from https://rethinkthc.com/research/schrott-2021-refraining-from-use-diminishes
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.