Production of virus-like particles with AsCas12a nuclease and CMV-driven crRNA for mammalian genome editing

Virus-like particles enable targeted gene engineering and pooled CRISPR screening in primary human myeloid cells.

A virus-like particle (VLP)-based toolkit that delivers diverse CRISPR editing modalities to human monocytes, macrophages and dendritic cells with high efficiency while preserving viability and innate immune responsiveness is presented.

Co-delivery of lentiviral vectors and Cas9-containing virus-like particles enables rapid, scalable manufacture of gene-edited CAR T cells

Chimeric antigen receptor T cell immunotherapies are transforming therapies for hematological malignancies and solid tumors and can be enhanced by targeted gene knockout. Here, we report lentiviral-based virus-like particles that package and deliver Cas9 ribonucleoproteins to primary human T cells. Using distinct pseudotyping strategies for virus-like particles and for lentiviral or γ-retroviral vectors, we achieved chimeric antigen receptor expression and targeted gene disruption. Under optimized transduction conditions, more than 50% of T cells expressed a chimeric antigen receptor by flow cytometry, with vector copy numbers exceeding two. Editing efficiencies were above 70% at three different target loci tested: T cell receptor α constant chain, β2-microglobulin, and DNA methyltransferase 3α. When the editing efficiency of virus-like particles was directly compared to electroporation, electroporation achieved a higher editing efficiency (99% versus 70%–90%). However, virus-like particle treatment resulted in twice as many cells being recovered compared with electroporation with a 10% increase in cell viability. Furthermore, off-target editing in virus-like particle-treated cells was reduced compared to ribonucleoprotein electroporated cells. These results support the feasibility of using virus-like particle-mediated delivery of Cas9 ribonucleoprotein to disrupt genes of interest, enabling a more scalable and cost-effective process for generating T cell immunotherapies.

Virus-like particle-delivered base editor collection to expand the genome engineering toolbox

It is revealed that a wide variety of mutation types are possible with the base editors in this VLP collection, revealing that a wide variety of mutation types are possible with the base editors in this collection.

Establishment of a scalable engineered cell-line platform for direct, GMP-grade production of eVLP vectors enabling streamlined generation of gene-edited CAR-T/NK cells

An industrial-grade platform based on monoclonal producer cell lines that enables the continuous and scalable generation of engineered virus-like particles (eVLPs) co-packaging Cas9–gRNA ribonucleoproteins (RNPs) and provides a GMP-compliant and broadly adaptable strategy for the streamlined manufacturing of next-generation autologous and allogeneic gene-edited CAR-T/NK therapies.

Efficient in vivo cytosine base editing using virus-like particles with uracil DNA glycosylase inhibition.

Compact 9dBEs Enable Efficient and Precise Genome Editing in Mammalian Cells and In Vivo

An efficient Cas9d system (Cas9dUltra) is developed through gRNA and protein engineering, and its base editors (9dBEs) further developed through gRNA and protein engineering, enabling efficient and precise genome editing in human cells.