A cytoplasmic RNA vector derived from nontransmissible Sendai virus with efficient gene transfer and expression

Area of Science:

• Virology
• Molecular Biology
• Gene Therapy

Background:

• Sendai virus (SeV) is a member of the Paramyxoviridae family.
• Defective viral genomes can be engineered for gene delivery applications.
• Gene therapy and vaccine delivery systems require efficient and safe vectors.

Purpose of the Study:

• To develop a novel gene expression vector derived from a defective Sendai virus (SeV) genome.
• To evaluate the vector's ability to deliver and express foreign genes in various cell types.
• To assess the potential of this vector for human gene therapy and vaccine delivery.

Main Methods:

• Recovery of functional ribonucleoprotein complexes (RNPs) from SeV cDNA defective in the F gene.
• Transfection of RNPs into cells inducibly expressing the F protein.
• Characterization of virion-like particles produced and their gene expression capabilities.

Main Results:

• A self-replicating, F-defective SeV virion was recovered, serving as a gene expression vector.
• The vector efficiently delivered and expressed enhanced green fluorescent protein in diverse animal and human cells, including non-dividing cells.
• The vector amplified specifically in F-expressing packaging cell lines in a trypsin-dependent manner and did not spread to F-nonexpressing cells.

Conclusions:

• A novel gene expression vector derived from a defective Paramyxoviridae genome has been successfully created.
• This SeV-based vector demonstrates high efficiency in gene delivery and expression across various cell types.
• The vector holds significant potential for applications in human gene therapy and vaccine delivery systems.