Related Experiment Videos
Dominant lethal test response with IMS and TEM using different combinations of male and female stocks of mice
Abstract:
We conducted dominant lethal studies with chemical mutagens IMS and TEM to investigate the influence which different treated male stocks might have upon individual female response. In both studies, treated males from a CD-1 random bred stock and each of two F1 hybrid stocks (C57BL/6N X C3H; C57BL/6J X BALB/c) were mated to untreated females from the two F1 hybrid stocks. We found that variation in response due to the treatment effect was modulated by the specific male stock/female stock combination involved. The male-dependent variation observed prevented any meaningful evaluation of relative female stock sensitivity but it was obvious that factors other than differences in repair capacity of female germ cells contributed to the response differences observed.
Insights
Male stock influenced chemical mutagen response in female mice, complicating assessments of female germ cell sensitivity. Genetic factors beyond repair capacity appear to affect mutagenic outcomes.
Area of Science:
- Toxicology
- Genetics
- Reproductive Biology
Background:
- Chemical mutagens like ethyl methanesulfonate (IMS) and triethylene melamine (TEM) are used to study genetic damage.
- Understanding factors influencing mutagen sensitivity is crucial for risk assessment.
Purpose of the Study:
- To investigate how different male mouse stocks affect female response to chemical mutagens.
- To determine if female germ cell repair capacity is the sole determinant of mutagen sensitivity.
Main Methods:
- Dominant lethal studies were performed using IMS and TEM.
- Treated males from CD-1 and two F1 hybrid stocks were mated with untreated F1 hybrid females.
- Female response was evaluated based on the genetic effects observed.
Main Results:
- The response to chemical mutagens varied significantly depending on the specific male stock and female stock combination.
- Observed male-dependent variations masked meaningful comparisons of female stock sensitivity.
- Evidence suggests factors beyond female germ cell repair capacity influence mutagenic response.
Conclusions:
- Male genetic background plays a significant role in modulating the mutagenic effects observed in females.
- The study highlights the complexity of genetic interactions in assessing chemical mutagen toxicity.
- Further research is needed to elucidate the specific factors contributing to male-dependent variations in mutagen response.