Fluorescently labeled adenovirus with pIX-EGFP for vector detection

Area of Science:

• Molecular Biology
• Virology
• Gene Therapy

Background:

• Adenoviruses (Ads) are widely studied for gene therapy applications and their role in pathogenesis.
• Existing methods for detecting adenoviral vectors, such as reporter gene expression and fluorophore labeling, are insufficient for evaluating transductional targeting efficiency.
• Cell-specific gene delivery using adenoviral vectors requires robust methods to assess targeting accuracy at the transductional level.

Purpose of the Study:

• To develop an improved method for detecting and analyzing adenoviral vectors, specifically addressing limitations in assessing transductional targeting.
• To create a genetically engineered adenoviral vector with a fluorescent label for enhanced detection and tracking capabilities.
• To evaluate the impact of genetic modification on adenoviral vector properties and its utility in various biological applications.

Main Methods:

• A genetic labeling system was engineered by creating a fusion protein between adenoviral capsid protein IX and Enhanced Green Fluorescent Protein (EGFP).
• The modified adenoviral vector was analyzed for DNA packaging, thermostability, DNA replication, cytopathic effects, and coxsackie adenovirus receptor (CAR)-dependent binding.
• The fluorescent properties of the labeled adenoviral particles were assessed using flow cytometry, live-cell imaging, and tissue section analysis.

Main Results:

• The fusion of capsid protein IX with EGFP resulted in a fluorescent adenoviral vector with minimal impact on key viral functions, including DNA packaging and thermostability.
• Essential viral characteristics such as DNA replication, cytopathic effect, and CAR-dependent binding remained unaffected by the genetic modification.
• The EGFP label was successfully integrated into the virus capsid, enabling efficient detection of adenoviral particles via flow cytometry and facilitating tracking in biological samples.

Conclusions:

• The developed genetic adenovirus labeling system provides a valuable tool for assessing transductional targeting in gene therapy vector development.
• This fluorescent labeling technique offers improved methods for detecting adenoviral vectors, studying adenovirus biology, and monitoring viral spread.
• The system holds potential for dynamic monitoring of adenovirus replication and dissemination, advancing research in virology and gene therapy.