Researchers in India have shown that baker's yeast can survive extreme conditions mimicking Mars, including shock waves and toxic salts. The study highlights the organism's resilience through protective cellular structures. These findings could inform astrobiology and future space missions.
Baker's yeast, scientifically known as Saccharomyces cerevisiae, has demonstrated remarkable toughness against environments simulating Mars. A team from the Department of Biochemistry at the Indian Institute of Science (IISc) in Bengaluru, collaborating with the Physical Research Laboratory (PRL) in Ahmedabad, exposed live yeast cells to intense shock waves and perchlorate salts—compounds prevalent in Martian soil.
The experiments utilized a High-Intensity Shock Tube for Astrochemistry (HISTA) in Bhalamurugan Sivaraman's lab at PRL, generating shock waves up to Mach 5.6, akin to meteorite impacts. Yeast cells faced 100 mM sodium perchlorate alone or combined with these waves. Despite slowed growth, the cells survived both stressors.
Lead author Riya Dhage, a project assistant in Associate Professor Purusharth I Rajyaguru's lab, noted the challenges: "One of the biggest hurdles was setting up the HISTA tube to expose live yeast cells to shock waves—something that has not been attempted before—and then recovering yeast with minimum contamination for downstream experiments."
Survival stemmed from the formation of ribonucleoprotein (RNP) condensates, membrane-less structures that safeguard mRNA under stress. Shock waves prompted stress granules and P-bodies, while perchlorate alone induced P-bodies. Yeast strains unable to form these were far less viable, suggesting RNP condensates as potential biomarkers for life in alien settings.
Dhage emphasized the study's novelty: "What makes this work unique is the integration of shock wave physics and chemical biology with molecular cell biology to probe how life might cope with such Mars-like stressors."
Rajyaguru, the corresponding author, expressed surprise: "We were surprised to observe yeast surviving the Mars-like stress conditions that we used in our experiments." He added, "We hope that this study will galvanize efforts to have yeast on board in future space explorations."
Published in PNAS Nexus (2025; 4(10); DOI: 10.1093/pnasnexus/pgaf300), the research positions yeast as a key model for astrobiology, potentially aiding the design of resilient biological systems for space.
