Development of mouse preimplantation embryos in space

Area of Science:

• Space Biology
• Developmental Biology
• Radiation Biology

Background:

• The possibility of extraterrestrial life and human reproduction in space remains a significant question.
• Understanding mammalian embryonic development under space conditions is crucial for long-duration space missions.

Purpose of the Study:

• To investigate the feasibility of preimplantation mouse embryonic development in space.
• To identify the effects of space environment factors, including microgravity and radiation, on embryonic development and epigenetics.

Main Methods:

• Cultured preimplantation mouse embryos in space.
• Assessed blastocyst formation rate and quality.
• Analyzed DNA damage and genome-wide DNA methylation patterns.
• Compared space-flown embryos with ground-based controls exposed to simulated microgravity and low-dose radiation.

Main Results:

• Preimplantation mouse embryos can develop into blastocysts in space, but with reduced efficiency and quality.
• Embryos developed in space exhibited significant DNA damage and global hypomethylation with unique differentially methylated regions.
• Ground-based low-dose radiation mimicked most of the observed developmental defects, DNA damage, and epigenetic abnormalities.
• Simulated microgravity alone did not cause major developmental disruptions.

Conclusions:

• Space radiation is the primary factor responsible for developmental defects in space-flown mammalian embryos.
• Long-term exposure to extreme low-dose radiation is a significant hazard for mammalian reproduction in space.
• This study advances the understanding of space's impact on embryonic development and highlights reproductive risks for astronauts.