Heritable translocation study in male mice with trimethyl phosphate

Area of Science:

• Toxicology
• Genetics
• Reproductive Biology

Background:

• Trimethyl phosphate (TMP) is a chemical agent with potential genotoxic effects.
• Assessing the reproductive toxicity and mutagenicity of industrial chemicals is crucial for human health and environmental safety.

Purpose of the Study:

• To investigate the dominant lethal and heritable translocation effects of trimethyl phosphate (TMP) in male mouse spermatids.
• To evaluate the dose-dependent genotoxicity of TMP.

Main Methods:

• Male mice were administered single intraperitoneal injections of TMP.
• Dominant lethal assays were conducted to assess early fetal deaths.
• Heritable translocation studies involved screening F1 male progeny for semi-sterility and cytogenetic analysis of chromosomes.
• Methyl methanesulfonate (MMS) was used as a positive control.

Main Results:

• TMP induced marked, dose-dependent increases in early fetal deaths.
• Heritable translocations were detected in F1 male progeny at TMP doses of 1000 and 1500 mg/kg.
• Translocation induction rates were 5.3% at the lower dose and 14.3% at the higher dose, with the latter comparable to 11.0% induced by 50 mg/kg MMS.
• Most translocation carriers exhibited semi-sterility or sterility.

Conclusions:

• Trimethyl phosphate (TMP) is capable of inducing chromosomal damage in mouse spermatids.
• The observed chromosomal damage can result in heritable translocations.
• TMP exhibits significant genotoxic and reproductive toxicity potential.