Epstein-Barr virus-based plasmid enables inheritable transgene expression in mouse cerebral cortex.

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• Cerebral cortex development relies on neural progenitor cells (NPCs) generating neurons and glial cells.
• Technical limitations in gene transfer to the mouse brain hinder long-term developmental studies.

Purpose of the Study:

• To develop a method for studying long-term cerebral cortex development by overcoming gene transfer limitations.
• To investigate the utility of an Epstein-Barr virus-based plasmid for sustained transgene expression in NPCs and their progeny.

Main Methods:

• In utero electroporation (IUE) of an Epstein-Barr virus-based plasmid (EB-oriP plasmid) into embryonic mouse brains.
• Combining EB-oriP plasmid with shRNA expression cassettes for gene examination.
• Utilizing cell type-specific promoters for preferential transgene expression.
• Sequential IUE of EB-oriP plasmid at different embryonic stages to assess NPC heterogeneity.

Main Results:

• EB-oriP plasmid-mediated IUE enabled sustained transgene expression in adult mouse brains, including descendant cells.
• The method allowed for the examination of gene function throughout continuous cerebral cortex development.
• Heterogeneity of NPCs was suggested by sequential plasmid introduction into embryos.
• Preferential transgene expression was achieved using cell type-specific promoters.

Conclusions:

• IUE using the EB-oriP plasmid is a powerful and novel tool for investigating long-term cerebral cortex development in mice.
• This technique overcomes previous limitations in studying the lineage and function of neural progenitor cells and their derivatives.