A virus-like particle system for encapsulating and delivering RNA-based agents across tissues and generations

Background

The field of RNA-based therapeutics and biotechnology has seen significant growth due to the potential of small RNA molecules, such as RNA interference (RNAi) and antisense RNAs, to modulate gene expression with high specificity. These molecules offer promising avenues for treating genetic diseases, controlling pests in agriculture, and even influencing complex biological behaviors. However, the effectiveness of RNA-based interventions is often limited by the challenge of delivering these molecules to specific tissues or organisms, particularly those that are naturally resistant to conventional delivery methods. For instance, neurons and certain nematode tissues are notoriously difficult to target, and the instability of RNA in biological environments further complicates delivery, as RNA is rapidly degraded by ubiquitous RNases.

Current approaches to RNA delivery, such as synthetic nanoparticles, liposomes, and viral vectors, face several significant limitations. Synthetic carriers often suffer from poor tissue specificity, low efficiency in crossing biological barriers, and potential toxicity or immunogenicity. Viral vectors, while efficient in some contexts, can provoke immune responses, have limited cargo capacity, and pose risks related to insertional mutagenesis. Furthermore, these methods frequently fail to protect RNA cargo from degradation, resulting in reduced efficacy. In agricultural and environmental applications, delivering RNA to target organisms or tissues is further complicated by the presence of complex biological matrices and the need for species-specific targeting. As a result, there is a pressing need for novel delivery systems that can efficiently, safely, and specifically transport RNA molecules to resistant tissues and across biological barriers, while also ensuring stability and protection of the RNA cargo.

Technology

The Cer1 retrotransposon system is an innovative RNA delivery platform derived from the endogenous virus-like particles (VLPs) of Caenorhabditis elegans. These VLPs, approximately 90 nm in size, encapsulate and protect small RNA molecules, such as RNA interference (RNAi) agents, antisense RNAs, and peptides, safeguarding them from RNase degradation and facilitating their targeted transport to specific tissues. Notably, the Cer1 VLPs enable the transfer of genetic signals between different tissues—such as from the germline to neurons—as well as between individual organisms and across generations. This system can deliver functional RNA cargo via secreted media, lysates, or purified VLP fractions, enabling applications ranging from therapeutic RNA delivery to agricultural pest control. The technology’s ability to mediate both vertical (parent-to-offspring) and horizontal (individual-to-individual) transfer of learned behaviors highlights its versatility and potential for broad biological impact.

What sets the Cer1 system apart is its unique use of a naturally occurring retrotransposon to achieve efficient, specific, and stable RNA delivery, particularly to tissues that are typically resistant to conventional vectors, such as neurons. Unlike synthetic nanoparticles or viral vectors, Cer1 VLPs are endogenous to the host organism, reducing immunogenicity and increasing biocompatibility. Experimental evidence demonstrates that Cer1 is essential for both the inheritance and acquisition of RNA-induced behaviors, with its absence abolishing these effects. The VLPs’ capacity to encapsulate and protect small RNAs enables robust transfer of epigenetic information, even through environmental exposure. Additionally, the system’s specificity is underscored by its independence from general extracellular vesicle pathways and its conservation among wild isolates possessing Cer1. This combination of natural origin, tissue-targeting capability, and demonstrated efficacy in both laboratory and ecological contexts positions the Cer1 VLP system as a differentiated and powerful tool for RNA-based therapeutics and biotechnological applications.

Benefits

• Enables protected encapsulation and delivery of small RNA molecules via virus-like particles (VLPs), shielding RNA from degradation.
• Facilitates targeted RNA delivery to tissues typically resistant to conventional vectors, including neurons.
• Supports both vertical (across generations) and horizontal (between individuals) transmission of RNA-based signals and behaviors.
• Utilizes an endogenous retrotransposon system, reducing reliance on synthetic or viral vectors.
• Applicable for RNA interference (RNAi), antisense RNA, and peptide delivery in therapeutic and agricultural contexts.
• Allows environmental secretion and uptake of RNA cargo, enabling non-invasive delivery methods.
• Potential to modulate behavior and treat nematode infections in animals and plants through RNA delivery.

Applications

• Therapeutic RNA delivery to neurons
• Agricultural pest behavior modification
• Treatment of nematode infections
• Transgenerational epigenetic therapy

Additional info

The Cer1 retrotransposon system utilizes 90 nm virus-like particles derived from Caenorhabditis elegans to encapsulate and protect small RNA cargo from RNase degradation. These particles facilitate horizontal and vertical genetic signal transfer between tissues and organisms. By leveraging endogenous mobile genetic elements, this technology enables targeted delivery of RNA interference molecules, antisense RNAs, and peptides to traditionally resistant tissues, supporting therapeutic RNA delivery and agricultural pest control applications.