Refraining from use diminishes cannabis-associated epigenetic changes in human sperm

Area of Science:

• Reproductive biology
• Epigenetics
• Genomics

Background:

• Cannabis use is prevalent globally.
• Sperm DNA methylation alterations have been linked to cannabis use.
• The reversibility of these epigenetic changes is not well understood.

Purpose of the Study:

• To investigate the reversibility of cannabis-associated sperm DNA methylation changes.
• To determine the impact of sustained cannabis abstinence on sperm epigenetics.

Main Methods:

• Collected semen samples from cannabis users and non-user controls at baseline and after 77 days of abstinence.
• Performed whole-genome bisulfite sequencing to analyze DNA methylation patterns.
• Compared methylation differences between groups and after abstinence.

Main Results:

• Identified 163 CpG sites with significant DNA methylation differences between users and controls.
• Genes associated with altered sites are involved in development, including cardiogenesis and neurodevelopment.
• Many methylation differences diminished after 77 days of cannabis abstinence.

Conclusions:

• Sustained cannabis abstinence significantly reduces sperm DNA methylation alterations.
• These findings suggest that epigenetic changes in sperm due to cannabis use are reversible.
• Abstinence may restore normal sperm epigenetics, potentially impacting early development.