Researchers have discovered that RNA droplets can shift from fluid structures into rigid, gel-like networks under high temperatures and acidic conditions, potentially solving how primitive molecules persisted in early Earth environments, according to a study published July 31, 2026, in Nature Communications.
RNA Droplets and the Origin of Life Puzzle
One of the biggest puzzles in origin-of-life research comes long before the first cells ever existed. Scientists have long questioned how fragile RNA molecules could gather in one place, interact frequently, and help produce early life without cellular compartments to hold them together, according to findings detailed by the University at Buffalo. Without boundaries, individual molecules would struggle to encounter one another in the primordial soup while also surviving the hot and acidic conditions of early Earth.
One possible solution involves RNA collecting into liquid-like droplets known as condensates. These membrane-free structures concentrate RNA in small spaces, boosting the chances of molecular interactions while offering protection from harsh surroundings. Research led by the University at Buffalo now explains why RNA is uniquely capable of forming these droplets. According to the study, a tiny chemical distinction between RNA and DNA helps RNA assemble into droplets more readily as temperatures rise.
Temperature and Chemistry: How RNA Outperforms DNA
To understand this behavior, researchers directly compared RNA with single-stranded DNA containing essentially the same sequences. Experiments showed that RNA started forming droplets at temperatures about 10 degrees Celsius lower than comparable DNA, signaling a much stronger tendency to condense. Furthermore, RNA formed interconnected networks within droplets more easily, shifting the material from a fluid state toward a gel-like structure that offers greater environmental protection.
Did You Know? RNA and DNA differ by just one oxygen atom on each sugar unit. RNA contains a 2′-hydroxyl (2′-OH) group, which DNA lacks entirely.
Using temperature-controlled microscopy, small-angle X-ray scattering, and molecular dynamics simulations, the team found that the 2′-OH group strengthens RNA’s interactions with magnesium ions while reducing surrounding water molecules. To test this mechanism, researchers chemically altered the group to 2′-Ome, a modification common in natural RNA. That single change reduced RNA’s tendency to condense and altered whether droplets stayed fluid or formed gels, according to lead corresponding author Priya R. Banerjee, Twentieth Century Club Professor in the UB Department of Physics.
Building Synthetic Cell Compartments from RNA
Building on these insights, Banerjee’s laboratory is currently working to engineer RNA droplets capable of performing basic cellular functions, including biochemical reactions. Researchers hope to program them as active, dynamic, cell-sized compartments that could eventually provide a foundation for creating synthetic cells made entirely from RNA. As noted by Banerjee, these self-organizing compartments were likely a crucial stepping stone toward single-cell organisms.
The research was conducted alongside Jerelle Joseph, assistant professor of chemical and biological engineering at Princeton University. Thurston. Financial support for the project was provided by the National Institutes of Health, the National Science Foundation, and Hypothesis Fund.
Frequently Asked Questions
Why were RNA droplets important for early Earth?
RNA condensates provided membrane-free compartments that concentrated fragile molecules, giving them more opportunities to interact and survive harsh, hot, and acidic primordial conditions.
What chemical difference separates RNA from DNA in these droplets?
RNA contains a 2′-hydroxyl (2′-OH) group on each sugar unit that DNA lacks. This single oxygen-containing group strengthens interactions with magnesium ions and drives droplet formation.
Who led the research study?
The study was led by Priya R.
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