Rain May Have Helped Form the First Cells, Kick-Starting Life As We Know It

How did early cells keep themselves distinct while allowing for some amount of exchange?

cells
(Credit: UChicago Pritzker School of Molecular Engineering/Peter Allen, Second Bay Studios, CC BY-ND)

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Billions of years of evolution have made modern cells incredibly complex. Inside cells are small compartments called organelles that perform specific functions essential for the cell’s survival and operation. For instance, the nucleus stores genetic material, and mitochondria produce energy.

Another essential part of a cell is the membrane that encloses it. Proteins embedded on the surface of the membrane control the movement of substances in and out of the cell. This sophisticated membrane structure allowed for the complexity of life as we know it. But how did the earliest, simplest cells hold it all together before elaborate membrane structures evolved?

In our recently published research in the journal Science Advances, my colleagues from the University of Chicago and the University of Houston and I explored a fascinating possibility that rainwater played a crucial role in stabilizing early cells, paving the way for life’s complexity.

The Origin of Life

One of the most intriguing questions in science is how life began on Earth. Scientists have long wondered how nonliving matter like water, gases, and mineral deposits transformed into living cells capable of replication, metabolism, and evolution.

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