A geminivirus AYVV-derived shuttle vector for tobacco BY2 cells

Area of Science:

• Molecular Biology
• Plant Biotechnology
• Virology

Background:

• Plant-E. coli shuttle vectors are crucial tools for genetic manipulation in plants.
• Geminiviruses offer unique replication mechanisms suitable for vector development.
• Stable maintenance and expression of foreign DNA in plant cell cultures remain a challenge.

Purpose of the Study:

• To develop a novel plant-E. coli shuttle vector based on the Ageratum yellow vein virus (AYVV) genome.
• To assess the stability and foreign gene expression capabilities of the developed vector in long-term plant cell cultures.
• To demonstrate the extrachromosomal replication of a monopartite begomovirus-derived vector in plant cells.

Main Methods:

• Construction of the pASV shuttle vector incorporating AYVV genome elements and a pUC19 backbone.
• Comparative replication studies in Nicotiana benthamiana and Nicotiana tabacum BY-2 cells.
• Detection of vector DNA via PCR, beta-glucuronidase assay, and plasmid rescue over a 4-month period.
• Methylation-based PCR assay to confirm de novo replication.

Main Results:

• Nicotiana tabacum BY-2 cells proved suitable for long-term maintenance of pASV vectors.
• Vector DNA was consistently detected, and reporter gene expression was observed over 4 months.
• De novo replication of pASV-derived vectors was confirmed in 2-month-old tobacco BY-2 cell lines.
• The study reports the first instance of stable extrachromosomal replication of a monopartite begomovirus vector with foreign gene expression in long-term cell cultures.

Conclusions:

• The developed pASV shuttle vector provides a stable platform for foreign gene expression in long-term plant cell cultures.
• This vector represents a significant advancement for genetic engineering and research in plant biotechnology.
• The findings open new avenues for utilizing geminivirus-based vectors in plant science.