Ethylene Glycol Monomethyl Ether Altered Rat Sperm Small RNAs with Critical Developmental Roles

Area of Science:

• Reproductive Toxicology
• Epigenetics
• Molecular Biology

Background:

• Ethylene glycol monomethyl ether (EGME) is a known testicular toxicant affecting spermatogenesis and male fertility.
• Previous studies show EGME exposure reduces sperm motility and alters sperm small RNA profiles.
• The role of sperm small non-coding RNAs (sncRNAs) in EGME-induced reproductive toxicity is not fully understood.

Purpose of the Study:

• To investigate the impact of EGME exposure on sperm sncRNA expression in male rats.
• To identify specific sncRNAs differentially expressed following EGME treatment.
• To explore the potential mechanism linking altered sperm sncRNAs to EGME's effects on fertility and embryonic development.

Main Methods:

• Male rats were exposed to varying doses of EGME.
• Sperm small non-coding RNA sequencing was performed.
• Differential expression analysis was conducted to identify altered sncRNAs.
• Bioinformatic tools were used to predict targets of differentially expressed microRNAs (miRNAs).

Main Results:

• EGME exposure led to dose-dependent increases in sperm microRNAs (miRNAs), piRNAs, and tRNA-derived small RNAs (tsRNAs).
• Twelve miRNAs showed monotonic, dose-dependent increases across all tested EGME doses.
• Predicted targets of these miRNAs are involved in crucial embryonic developmental processes.

Conclusions:

• EGME exposure reproducibly alters sperm sncRNA levels in a dose-dependent manner.
• Specific miRNAs in sperm are significantly affected by EGME.
• Altered sperm sncRNAs represent a potential mechanism for paternal EGME effects on embryonic development.