Advances in foamy virus vector systems: Development and applications

Area of Science:

• * Gene Therapy and Virology
• * Retroviral Vector Development

Background:

• * Foamy viruses (FVs) are retroviruses with a favorable integration profile for gene therapy applications.
• * Prototype FV (PFV) vectors have been engineered for high-titer, large transgene delivery and replication incompetence, enhancing safety.
• * FV's broad host tropism is attributed to heparan sulfate (HS) binding via the FV Env receptor-binding domain (RBD).

Purpose of the Study:

• * To review the development and utilization of FV vector systems for gene therapy.
• * To highlight the advantages of FV vectors, including safety, broad tropism, transgene capacity, and persistence.
• * To discuss the potential of FV vectors in addressing current gene therapy challenges and treating genetic diseases.

Main Methods:

• * Review of existing literature on FV vector system development and applications.
• * Analysis of PFV vector iterations, including third-generation and dual-vector systems.
• * Examination of FV vector use in hematopoietic stem cell (HSC) gene therapy models.

Main Results:

• * FV vectors demonstrate a safer integration profile compared to other retroviruses.
• * Engineered PFV vectors accommodate large transgenes and are replication-incompetent.
• * FV vectors have shown efficacy in HSC gene therapy for monogenic diseases and anti-HIV applications in preclinical models.
• * Vectors successfully delivered anti-HIV transgenes and induced antibodies against HIV.

Conclusions:

• * FV vector systems are valuable tools for gene therapy, offering unique advantages like non-pathogenicity and broad host tropism.
• * Further development, including stable producer cell lines, will enhance gene delivery efficiency.
• * FV vectors hold significant potential for treating genetic disorders and advancing anti-HIV gene therapy and vaccine strategies.