Cytoplasmic expression of ribozyme in zebrafish using a T7 autogene system

Area of Science:

• Molecular Biology
• Developmental Biology
• Zebrafish Models

Background:

• Ribozymes are catalytic RNA molecules with potential for gene targeting.
• Efficient cytoplasmic expression systems are crucial for RNA-based therapeutics and research.
• Targeting specific mRNA in vivo can elucidate gene function and disease mechanisms.

Purpose of the Study:

• To develop and characterize a novel cytoplasmic ribozyme expression system.
• To demonstrate the system's efficacy in generating a specific phenotype in zebrafish by targeting no tail mRNA.
• To explore the system's potential for gene function discovery and therapeutic applications.

Main Methods:

• Codelivery of a ribozyme vector, T7 autogene vector, and T7 RNA polymerase (RNAP) into zebrafish embryos.
• Expression of a ribozyme targeting no tail (ntl) mRNA under dual T7 and adenoviral va 1 (pol III) promoters.
• Phenotypic analysis of zebrafish embryos to assess ribozyme activity and efficiency.

Main Results:

• Successful rapid synthesis of the ribozyme targeting ntl mRNA in the cytoplasm of injected zebrafish embryos.
• Generation of no tail phenotypes in 10-20% of injected zebrafish embryos.
• Phenotypic change rates correlated with concentrations of plasmid vectors, T7 RNAP, and component ratios.

Conclusions:

• The developed cytoplasmic ribozyme expression system enables efficient in vivo mRNA targeting.
• This system provides a valuable tool for rapid gene function identification in zebrafish and humans.
• Potential applications include gene therapy for genetic and acquired diseases.