A tiny chemical distinction makes RNA higher than DNA at forming liquid-like droplets underneath excessive temperatures and acidic circumstances.
One of many greatest puzzles in origin of life analysis comes earlier than the primary cells even existed: How may RNA molecules collect in a single place, work together, and assist produce youth with out mobile compartments to carry them collectively?
With out these boundaries, fragile RNA molecules would have struggled to come across each other usually sufficient within the primordial soup, whereas additionally surviving the new and acidic circumstances thought to characterize early Earth.
One doable answer is RNA’s potential to gather into liquid-like droplets referred to as condensates. These buildings don’t have any membrane, however they might have concentrated RNA molecules in small areas, giving them extra alternatives to work together whereas probably providing some safety from harsh environment.
Analysis led by the College at Buffalo is now serving to clarify why RNA is particularly able to forming these droplets. Printed in Nature Communications, the examine discovered {that a} very small chemical distinction between RNA and DNA helps RNA assemble into droplets extra readily as temperatures enhance. That very same distinction additionally makes the droplets extra more likely to become inflexible, gel-like networks.
“These findings reveal, for the primary time, how remarkably small adjustments in molecular chemistry can management the emergence of a lot bigger, self-organized biomolecular buildings like RNA condensates,” says lead corresponding writer Priya R. Banerjee, PhD, Twentieth Century Membership Professor within the UB Division of Physics. “They might enable us to finally handle even deeper questions, like whether or not these condensates helped bridge the hole between easy molecules and the earliest types of life.”
The analysis was carried out with Jerelle Joseph, PhD, assistant professor of chemical and organic engineering at Princeton College, and obtained assist from the Nationwide Institutes of Well being, the Nationwide Science Basis, and Speculation Fund.
RNA droplets may clear up a prebiotic drawback
The examine is a part of Banerjee’s broader work on RNA world concept, which proposes that RNA was central to the emergence of life on Earth. As a result of RNA can each retailer genetic data and catalyze chemical reactions, it might have been able to finishing up chemistry that finally contributed to the emergence of DNA, proteins, and the primary cells.
A serious problem for the speculation is explaining how comparatively unstable RNA may have endured harsh prebiotic environments and the way sufficient molecules may have collected collectively to work together earlier than mobile compartments existed.
Warmth transforms clusters of RNA into liquid-like droplets. The examine discovered that temperature can alter the bodily properties of RNA condensates, permitting a extra networked construction to loosen up into rounded droplets. Credit score: Priya Banerjee/College at Buffalo
RNA condensates might supply a part of the reason. In a 2023 examine, Banerjee and colleagues confirmed that RNA naturally tends to arrange into liquid-like droplets at excessive temperatures.
The researchers constructed on that discovering by straight evaluating RNA with single-stranded DNA containing basically the identical sequences.
Their experiments confirmed that RNA began forming droplets at temperatures about 10 levels Celsius decrease than comparable DNA, indicating that RNA has a stronger tendency to condense. RNA additionally shaped interconnected networks inside the droplets extra simply, shifting the fabric from a fluid state towards a extra gel-like construction that would supply higher safety underneath harsh environmental circumstances.
One oxygen atom adjustments condensation
The distinction seems to stem partly from a remarkably small chemical distinction. RNA and DNA differ by just one oxygen atom on every sugar unit. RNA incorporates a chemical group referred to as a 2′-hydroxyl (2′-OH), which DNA lacks.
Utilizing temperature-controlled microscopy, small-angle X-ray scattering, and molecular dynamics simulations carried out by the Joseph group, the researchers discovered that the two′-OH seems to strengthen RNA’s interactions with magnesium ions whereas lowering the variety of water molecules surrounding its spine in contrast with DNA. Collectively, these properties make it simpler for RNA molecules to collect as temperature rises.
To check whether or not the two′-OH was accountable, the researchers chemically altered it to 2′-Ome, a modification much like these current in lots of naturally occurring RNA molecules. The change decreased RNA’s tendency to condense and affected whether or not the ensuing droplets stayed fluid or developed into gel-like materials.
“This single oxygen-containing group on RNA’s sugar has a surprisingly highly effective impact on whether or not these molecules come collectively, stay dynamic or develop into arrested right into a gel-like materials,” says first writer Gable Wadsworth, PhD, a postdoc in Banerjee’s lab who will be a part of the College of Texas at El Paso as an assistant professor this fall.
Researchers are constructing cell-sized RNA compartments
Banerjee’s laboratory is now attempting to engineer RNA droplets able to performing some primary mobile features, together with biochemical reactions. The researchers hope to program them as energetic, dynamic, cell-sized compartments that would finally present a basis for creating artificial cells made solely from RNA.
“These sorts of self-organizing RNA compartments had been probably a step alongside the best way to single-cell organisms,” Banerjee says.
Reference: “The position of the two’-OH group in section separation and percolation transitions of RNA” by Gable M. Wadsworth, Dilimulati Aierken, George M. Thurston, Jerelle A. Joseph and Priya R. Banerjee, 31 July 2026, Nature Communications.
DOI: 10.1038/s41467-026-75961-2
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