Bisphenol A Exposure and Sperm ACHE Hydroxymethylation in Men

Area of Science:

• Environmental Epigenetics
• Reproductive Toxicology
• Sperm Biology

Background:

• Bisphenol A (BPA) exposure is linked to impaired human sperm quality.
• Epigenetic mechanisms mediating BPA's effects on sperm remain largely unknown.
• The sperm-expressed acetylcholinesterase (ACHE) gene is involved in sperm apoptosis.

Purpose of the Study:

• To investigate the association between BPA exposure and sperm ACHE gene hydroxymethylation.
• To explore potential epigenetic modifications in sperm due to occupational BPA exposure.

Main Methods:

• Study included 157 male factory workers (74 exposed, 83 controls).
• Urine BPA levels and sperm ACHE gene hydroxymethylation (5hmC) were measured.
• Statistical analyses, including linear regression, were performed adjusting for confounders.

Main Results:

• Sperm ACHE hydroxymethylation levels were significantly higher in the BPA-exposed group (p=0.041).
• Higher hydroxymethylation levels were observed across all BPA exposure tertiles compared to below the limit of detection.
• A positive linear association was noted between urine BPA concentration and sperm ACHE 5hmC rate, though not consistently significant across all strata.

Conclusions:

• Sperm ACHE gene 5-hydroxymethylcytosine (5hmC) is positively associated with BPA exposure.
• This finding provides supportive evidence for BPA's impact on male fertility.
• Epigenetic changes in sperm may contribute to BPA-induced health effects.