Billions of years ago, the very first cells emerged and gave rise to life on Earth. How these ancient cells formed has been a mystery. Now, a team of evolutionary biologists suggests how clay–perhaps near hydrothermal springs on the ocean floor–may have spurred the formation of these early cells.
Previous studies have shown that clays can catalyze the assembly of RNA molecules, the instructions that cells use to make proteins. Perhaps the same might be true for cellular lipid membranes, reasoned Jack Szostak and his colleagues at Massachusetts General Hospital in Boston.
To test their theory, the researchers added small particles of montmorillonite–a clay widespread in the environment–to a solution of small lipid spheres called micelles.