Complete replication-competent adenovirus 11p vectors with E1 or E3 insertions show improved heat stability

Area of Science:

• * Virology
• * Molecular Biology
• * Gene Therapy Vectors

Background:

• * Conventional adenovirus vectors with gene deletions exhibit reduced virion stability.
• * This instability limits their efficacy in therapeutic applications.

Purpose of the Study:

• * To engineer complete replication-competent adenovirus type 11p (RCAd11p) vectors with enhanced virion stability.
• * To investigate the impact of genome size and gene insertion site on vector stability.

Main Methods:

• * Construction of RCAd11p vectors with a GFP cassette inserted upstream of E1A or in the E3A region.
• * Assessment of vector expression levels (hexon, E1 genes) and cytopathic effect.
• * Evaluation of virion heat stability through incubation at 47°C for 5 hours.
• * Electron microscopy to quantify intact virus particles post-heat treatment.

Main Results:

• * RCAd11p vectors with oversized genomes exhibited improved heat stability compared to wild-type Ad11p.
• * The RCAd11pE3 vector demonstrated the highest heat tolerance among the tested vectors.
• * Genome size and insertion site significantly influenced the virion stability of engineered adenovirus vectors.

Conclusions:

• * Engineered replication-competent adenovirus vectors can overcome the stability limitations of conventional vectors.
• * Both the size of the viral genome and the location of inserted genes are critical factors determining virion stability.
• * These findings have implications for the development of more robust adenovirus-based gene delivery systems.