Mouse genomic associations with in vitro sensitivity to simulated space radiation

Area of Science:

• Genomics
• Radiation Biology
• Astrobiology

Background:

• Ionizing radiation poses significant health risks for deep space missions.
• Understanding genomic and environmental factors influencing radiation sensitivity is critical.
• This knowledge is vital for space exploration, astronaut safety, and cancer treatment.

Purpose of the Study:

• To identify genetic variations associated with DNA damage from ionizing radiation.
• To evaluate radiation risk for astronauts and inform cancer therapy.
• To explore potential biomarkers for DNA integrity.

Main Methods:

• Single nucleotide polymorphisms (SNPs) were identified in 15 mouse strains.
• In vitro DNA damage was quantified using 53BP1 positive nuclear foci.
• Statistical analysis linked SNPs to cellular signaling, metabolism, tumorigenesis, and nervous system pathways.

Main Results:

• Genomic associations differed in early (4-8h) versus later (24h) radiation responses.
• Later DNA damage responses showed greater overlap across different radiation types (LET).
• A subset of pathways correlated with spontaneous DNA damage, indicating 53BP1 foci as a potential biomarker.

Conclusions:

• Identified mouse strains and genetic loci can model ionizing radiation impact.
• Findings are crucial for refining human DNA damage response studies.
• Results may identify targets for space travel radiation countermeasures.