Prenatal Cannabis Exposure Left Lasting Marks on Children's DNA Through at Least Age 27
Two longitudinal studies found that prenatal cannabis exposure was associated with DNA methylation changes in genes involved in brain development, detectable at birth, age 7, age 15-17, and age 27.
Quick Facts
What This Study Found
Prenatal cannabis exposure was associated with genome-wide significant DNA methylation differences at birth, 7 years, 15-17 years, and 27 years. Several genes (LZTS2, NPSR1, NT5E, CRIP2, DOCK8, COQ5, LRP5) showed shared methylation changes across multiple time points. Functional pathway analysis consistently showed enrichment for neurodevelopment, neurotransmission, and neuronal structure pathways across all timepoints in both cohorts.
Key Numbers
Two cohorts (ALSPAC UK, CHDS New Zealand); DNA methylation assessed at 0, 7, 15-17, and 27 years; 7 genes showed shared changes across multiple timepoints; neurodevelopment pathways enriched across all timepoints.
How They Did This
Epigenome-wide association study using two longitudinal cohorts: ALSPAC (UK, examined at 0, 7, and 15-17 years) and CHDS (New Zealand, examined at ~27 years). Examined DNA methylation differences associated with prenatal cannabis exposure alone and co-exposure with tobacco.
Why This Research Matters
This is among the most comprehensive evidence that prenatal cannabis exposure creates lasting epigenetic changes in offspring. The persistence of changes from birth through age 27, replicated across two cohorts and two countries, strengthens the case that prenatal cannabis exposure has long-term biological consequences.
The Bigger Picture
Epigenetics represents a mechanism by which environmental exposures during pregnancy can have lasting effects on offspring without changing the DNA sequence itself. This study provides a molecular link between the epidemiological evidence of prenatal cannabis effects and the neurodevelopmental outcomes observed in exposed children.
What This Study Doesn't Tell Us
Cannot prove that methylation changes cause functional problems. Prenatal exposure is based on maternal self-report. Cannot fully separate cannabis effects from tobacco co-exposure or other confounders. Different cohorts and timepoints used different methylation platforms.
Questions This Raises
- ?Do the identified methylation changes actually translate to altered gene expression and brain function?
- ?Are these changes reversible, or do they persist throughout life?
- ?Could epigenetic markers serve as biomarkers for prenatal cannabis exposure?
Trust & Context
- Key Stat:
- Prenatal cannabis exposure left DNA methylation marks in brain development genes through age 27
- Evidence Grade:
- Strong: Multi-cohort, multi-timepoint epigenome-wide study replicated across two countries (UK and New Zealand) with consistent pathway enrichment at every age examined.
- Study Age:
- Published in 2025 using longitudinal data spanning birth to age 27.
- Original Title:
- Prenatal cannabis exposure is associated with alterations in offspring DNA methylation at genes involved in neurodevelopment, across the life course.
- Published In:
- Molecular psychiatry, 30(4), 1418-1429 (2025)
- Database ID:
- RTHC-07262
Evidence Hierarchy
Follows a group of people over time to track how outcomes develop.
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. Environmental exposures during pregnancy can alter methylation patterns in the developing fetus, potentially affecting how genes function throughout life.
Does this mean prenatal cannabis permanently changes a child's DNA?
The study found lasting changes in DNA methylation (which affects gene activity) but not in the DNA sequence itself. These epigenetic changes were detectable from birth through age 27 in genes involved in brain development. Whether they cause functional problems requires further research.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-07262APA
Noble, Alexandra J; Adams, Alex T; Satsangi, Jack; Boden, Joseph M; Osborne, Amy J. (2025). Prenatal cannabis exposure is associated with alterations in offspring DNA methylation at genes involved in neurodevelopment, across the life course.. Molecular psychiatry, 30(4), 1418-1429. https://doi.org/10.1038/s41380-024-02752-w
MLA
Noble, Alexandra J, et al. "Prenatal cannabis exposure is associated with alterations in offspring DNA methylation at genes involved in neurodevelopment, across the life course.." Molecular psychiatry, 2025. https://doi.org/10.1038/s41380-024-02752-w
RethinkTHC
RethinkTHC Research Database. "Prenatal cannabis exposure is associated with alterations in..." RTHC-07262. Retrieved from https://rethinkthc.com/research/noble-2025-prenatal-cannabis-exposure-is
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.