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Published on: April 7, 2014
Ovotoxicant VCD disrupts oocyte meiosis in mice by impairing m6A/IGF2BP3-mediated mRNA stability
Yang Li1,2, Yuling Zhou2, Jian Liu1
1Department of Gynecology, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China.
Abstract:
Environmental toxicants pose a significant threat to female reproductive health, yet the molecular mechanisms through which they impair oocyte quality are often unclear. Although the industrial chemical 4-vinylcyclohexene diepoxide (VCD) is known to cause ovarian follicle loss, how it disrupts essential processes such as meiosis remains poorly understood. Here, we show that VCD exposure triggers meiotic failure in mouse oocytes by altering a key RNA modification pathway known as m6A methylation. VCD treatment reduces ovarian reserve, elevates oxidative stress, and causes severe chromosome segregation defects. We find that VCD dysregulates the expression of m6A writers and erasers, leading to altered methylation of transcripts critical for cell division and meiosis. Specifically, VCD downregulates the RNA-binding protein IGF2BP3, which destabilizes target genes required for chromosome alignment and spindle assembly. Our results reveal how an environmental toxin can cause epitranscriptomic dysregulation and meiotic failure, providing a new perspective on pollutant-induced fertility decline. This work highlights the m6A pathway as a potential therapeutic target and underscores the broader reproductive risks posed by chemical exposures.
Insights
Environmental toxicants like 4-vinylcyclohexene diepoxide (VCD) disrupt female fertility by impairing meiosis. VCD exposure alters m6A RNA methylation, leading to oocyte quality decline and potential infertility.
Area of Science:
- Reproductive Biology
- Toxicology
- Molecular Biology
Background:
- Environmental toxicants threaten female reproductive health.
- The mechanisms by which toxicants impair oocyte quality, particularly meiosis, are not fully understood.
- 4-vinylcyclohexene diepoxide (VCD) is an industrial chemical known to cause ovarian follicle loss.
Purpose of the Study:
- To investigate the molecular mechanisms by which VCD impairs meiotic processes in mouse oocytes.
- To explore the role of m6A methylation in VCD-induced oocyte dysfunction.
- To identify potential therapeutic targets for mitigating pollutant-induced reproductive harm.
Main Methods:
- Exposure of mouse oocytes to VCD.
- Assessment of ovarian reserve and oxidative stress levels.
- Analysis of chromosome segregation and meiotic spindle assembly.
- Evaluation of m6A RNA methylation pathway components (writers, erasers) and target gene expression, including IGF2BP3.
Main Results:
- VCD exposure reduces ovarian reserve and increases oxidative stress.
- VCD causes severe chromosome segregation defects and meiotic failure in oocytes.
- VCD dysregulates m6A methylation by altering expression of m6A writers/erasers.
- VCD downregulates IGF2BP3, destabilizing key meiotic genes and impairing chromosome alignment and spindle formation.
Conclusions:
- VCD induces meiotic failure in oocytes through epitranscriptomic dysregulation of m6A methylation.
- The study reveals a novel mechanism of pollutant-induced female infertility.
- The m6A pathway presents a potential therapeutic target for chemical-induced reproductive damage.
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