A Sendai Virus-Based Cytoplasmic RNA Vector as a Novel Platform for Long-Term Expression of MicroRNAs

Area of Science:

• Biotechnology
• Molecular Biology
• Virology

Background:

• Cytoplasmic RNA virus vectors offer safe microRNA (miRNA) delivery without chromosomal insertion risks.
• Short-term expression of current vectors limits applications requiring sustained miRNA activity, like cell reprogramming.

Purpose of the Study:

• To develop a replication-defective Sendai virus vector (SeVdp) for persistent miRNA production.
• To evaluate SeVdp's efficacy in long-term gene silencing and somatic cell reprogramming.

Main Methods:

• Engineered a replication-defective Sendai virus (SeVdp) vector for miRNA expression.
• Delivered miRNAs and transcription factors into fibroblasts using the SeVdp vector.
• Assessed miRNA production, gene silencing, and induced pluripotent stem cell (iPSC) generation.

Main Results:

• SeVdp enabled long-term miRNA production and sequence-specific target suppression.
• Simultaneous delivery of miRNAs and transcription factors via SeVdp effectively reprogrammed fibroblasts into iPSCs.
• Murine miR-367 hairpin backbone facilitated elevated artificial miRNA production within the SeVdp vector.

Conclusions:

• SeVdp is a powerful platform for sustained miRNA delivery and gene silencing.
• This technology holds significant potential for applications in regenerative medicine, gene therapy, and cell therapy.