Neurospora prototroph selection system for studying aneuploid production

Area of Science:

• Genetics
• Molecular Biology
• Environmental Toxicology

Background:

• Aneuploidy, an abnormal chromosome number, can result from errors during meiosis.
• Environmental agents are increasingly scrutinized for their potential to induce genetic damage.
• Developing reliable screening systems for aneuploidy-inducing agents is crucial for public health.

Purpose of the Study:

• To evaluate the efficacy of a Neurospora crassa model system for detecting environmental agents that induce aneuploidy during meiosis.
• To identify specific environmental agents capable of increasing aneuploid frequencies.

Main Methods:

• Utilized a specific Neurospora crassa cross between two multiply marked strains, heterozygous for four auxotrophic mutations on chromosome 1.
• Selected for prototrophic disomic aneuploid products by plating ascospores on minimal medium.
• Screened 48 different environmental agents for their ability to induce aneuploidy.

Main Results:

• At least 10 out of 48 tested agents significantly elevated the frequency of aneuploid products compared to control groups.
• Several identified aneuploidy-inducing agents have demonstrated similar activity in other detection systems.
• The Neurospora system proved effective in identifying agents that disrupt meiotic chromosome segregation.

Conclusions:

• The Neurospora aneuploidy detection system is a viable and effective tool for screening environmental agents.
• This model system can be applied for widespread testing of environmental agents for their potential to cause aneuploidy.
• Findings support the use of Neurospora in risk assessment for environmental mutagens affecting meiosis.