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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Related Experiment Video

Updated: Apr 9, 2026

Generation of Cationic Nanoliposomes for the Efficient Delivery of In Vitro Transcribed Messenger RNA
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Humanized extracellular vesicles for efficient RNA delivery.

Xiang Ma1,2, Sophia R Zhao1,2, Constance L Cepko1,2

  • 1Department of Genetics, Harvard Medical School, Boston, MA 02115.

Proceedings of the National Academy of Sciences of the United States of America
|April 7, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new assay to optimize engineered extracellular vesicles (EVs) for RNA delivery. This human-derived EV system shows efficient RNA delivery and reduced immunogenicity, offering a promising alternative to viral vectors.

Keywords:
EABREpsin N-terminal homology (ENTH)citramalyl-CoA lyase beta-like protein (CLYBL)enveloped protein nanocages (EPNs)functional titers

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Nanomedicine

Background:

  • Engineered extracellular vesicles (EVs) are promising nonviral vectors for RNA delivery.
  • Enveloped protein nanocages (EPNs) enhance cargo loading but require better optimization assays.
  • Current methods lack single-unit activity assessment for EPNs.

Purpose of the Study:

  • To develop a biological titration assay for single, active engineered EVs.
  • To optimize engineered EVs using a modular, human-derived protein platform.
  • To evaluate the RNA delivery efficiency and immunogenicity of the optimized EVs.

Main Methods:

  • Developed a biological titration assay for engineered EVs, adapted from infectious viral particle methods.
  • Engineered EVs using a modular platform with human-derived protein components (epsin 1, CLYBL, CEP55).
  • Incorporated a nonhuman peptide for RNA packaging.

Main Results:

  • Achieved efficient RNA delivery with functional titers comparable to lentiviral vectors.
  • The optimized human-derived EVs demonstrated reduced immunogenicity compared to EPNs and VLPs.
  • The new assay enables direct comparison and optimization of engineered EV variants.

Conclusions:

  • The developed assay facilitates the optimization of engineered EVs for RNA delivery.
  • The human-derived EV system offers efficient RNA delivery with potentially lower immunogenicity.
  • This platform represents a significant advancement in nonviral gene therapy and vaccine delivery vectors.