The authors report that suspensions of DNA or RNA undergo a sequence of colloidal transitions when exposed to solutions of increasing salt concentration. At low salt concentrations there is no aggregation; with initial increases in ionic strength the onset of aggregation is observed. Continued increases in ionic strength lead to the formation of stable, reproducible, and well-defined particulate aggregates.
These aggregation events are driven by the ionic environment and the colloidal interactions between nucleic acid strands in suspension. The study emphasizes control of aggregation through simple modulation of solution ionic strength as the primary lever for producing particulate assemblies that can encapsulate or bundle oligonucleotide libraries.
The particulate assemblies formed under higher ionic strength conditions are described as kinetically trapped at room temperature. The authors introduce the term nucleic acid PACKeTs—Partitioned Aggregates of Colloidal DNA/RNA through Kinetic Trapping—to refer to these stable nanoaggregates.
Key properties reported include stability and reproducibility of the aggregate structures and their kinetic persistence at ambient conditions. Because the aggregates are kinetically trapped rather than at equilibrium, their assembly state can be long-lived at room temperature, enabling downstream manipulations and use as discrete units for handling nucleic acid libraries.
The work demonstrates that these nanoaggregates can partition DNA libraries that encode digital image files. By bundling oligonucleotide libraries that contain encoded information, the aggregates act as discrete 'files' in which specific data sets are physically co-located within particulate assemblies.
The authors show that partitioning is stable, indicating that the aggregation process can segregate and maintain distinct libraries corresponding to different encoded images. Details on encoding schemes, error rates, or storage density are not provided in this summary and were not reported in the source text.
File-specific random access is achieved by bundling DNA libraries with unique address oligos. In practice, libraries bearing different address sequences become associated with different nanoaggregate populations, allowing selective retrieval or handling of a particular file by targeting its address oligo.
The report highlights that bundling with unique address oligos supports random access to specific nanoaggregate files, enabling selective access to particular encoded information within a mixed population of nucleic acid assemblies.
An important functional attribute reported is the ability to rapidly obfuscate data by disrupting and reforming the nanoaggregate bundles. Simple external perturbations—fluid shear or temperature annealing—can break apart the aggregates and then allow them to reform into scrambled bundles, effectively rearranging which oligos are co-located.
This reversible process provides a mechanism for dynamic data obfuscation or scrambling. Because the aggregates are kinetically trapped, their state can be actively changed by externally applied shear or thermal treatments, enabling reversible transitions between partitioned (accessible) and obfuscated (scrambled) states.
By connecting fundamental ionic colloidal aggregation behavior to manipulation of nucleic acid libraries, the authors propose new functional possibilities: kinetically trapped data partitioning, file-specific random access, and methods for data encryption or obfuscation at the molecular level.
The PACKeTs concept presents a platform where simple physicochemical controls—salt concentration, shear, and temperature—mediate the organization and reorganization of information-bearing nucleic acids. The report frames these outcomes as enabling novel workflows or device concepts for managing nucleic-acid-encoded information.
The authors declared no competing interests. Funding sources acknowledged in the report include the US National Science Foundation (grants ECCS-2027655, DMR-2303581, DMR-2243104) and the US Department of Education Graduate Assistance in Areas of Need fellowship. The work was posted as a preprint on bioRxiv and is available under the copyright terms noted by the authors and funders.
Note: This summary reflects the findings and descriptions provided in the source preprint. Specific experimental parameters, quantitative metrics, and methodological details beyond the conceptual and observational findings summarized here were not reported in the source text provided.