A Tiny Chemical Tweak From 4 Billion Years Ago May Be the Reason We Exist Today

Key Points:

• Scientists have long theorized that before DNA, Earth hosted an "RNA World" where RNA molecules stored genetic information and catalyzed chemical reactions, despite doubts about RNA's stability under early Earth's extreme conditions.
• New research from the University at Buffalo and Princeton University identifies the 2′-hydroxyl (2′-OH) group in RNA as crucial for its survival, as it promotes the formation of gel-like droplets at high temperatures that could have protected RNA molecules on the early Earth.
• These RNA condensates may have acted as primitive compartments, potentially bridging the gap between simple molecules and the earliest forms of life before the evolution of cell walls.
• The findings highlight how small chemical differences can lead to larger self-organized biomolecular structures, offering insights into the origins of life and guiding further research into RNA behavior in cell-like environments.