Related Experiment Videos
Comparative investigations with trypaflavin in metaphase-II oocytes and in dominant lethal assay
Abstract:
Pregnant C3H mice were orally treated with 50 mg Trypaflavin/kg on day 7, 11, 14, or 15 post conception. The embryos were thus treated in utero with the test compound. At the age of 10 weeks, the dominant lethal assay was performed with F1 females. Dominant lethal mutations were induced only in those mice treated in utero on day 7 of the prenatal stage. Female C3H mice were chronically treated with Trypaflavin (50 X 2 mg/kg/day; dissolved in drinking water). These mice were caged with untreated males. The percentage of preimplantation egg loss and the yield of dead implants per female was increased. Female NMRI mice were chronically treated with Trypaflavin (50 X 2 mg/kg/day by stomach tube). In metaphases II of unfertilized oocytes, the yield of all observed aberration types (aneuploidies, gaps, satellite associations, breaks and fragments, deletions, and interchanges) was increased weakly.
Insights
Trypaflavin induced dominant lethal mutations in mice when administered during early prenatal development. Chronic exposure also increased preimplantation egg loss and chromosomal aberrations in oocytes.
Area of Science:
- Toxicology
- Developmental Biology
- Genetics
Background:
- Trypaflavin is a dye with potential mutagenic properties.
- Assessing the developmental toxicity and genotoxicity of chemical compounds is crucial for risk assessment.
Purpose of the Study:
- To evaluate the mutagenic effects of Trypaflavin in pregnant mice.
- To determine the developmental toxicity and genotoxicity of Trypaflavin exposure.
Main Methods:
- Pregnant mice (C3H and NMRI strains) were treated with Trypaflavin at various stages of gestation.
- Dominant lethal assays were performed on F1 females.
- Oocytes from treated female mice were analyzed for chromosomal aberrations.
Main Results:
- Trypaflavin induced dominant lethal mutations when administered on day 7 of prenatal development.
- Chronic Trypaflavin treatment increased preimplantation egg loss and dead implants.
- Weakly increased chromosomal aberrations were observed in oocytes of NMRI mice.
Conclusions:
- Prenatal exposure to Trypaflavin on day 7 can cause dominant lethal mutations.
- Chronic Trypaflavin exposure negatively impacts reproductive outcomes and induces chromosomal damage.