Packaging cells for avian leukosis virus-based vectors with various host ranges

Area of Science:

• * Virology
• * Molecular Biology
• * Genetics

Background:

• * The Haydée semipackaging cell line previously established produces avian leukosis virus (ALV) gag and pol proteins.
• * Development of packaging cell lines is crucial for producing replication-defective viral vectors.

Purpose of the Study:

• * To construct novel packaging cell lines expressing specific avian leukosis virus envelope (env) subgroups.
• * To generate helper-free ALV particles encoding the lacZ reporter gene with defined env specificities (A, B, C, E).
• * To investigate the influence of env subgroup and target cell type on recombinant lacZ virus titers.

Main Methods:

• * Utilized the established Haydée semipackaging cell line.
• * Constructed new packaging cells by introducing specific ALV env genes.
• * Produced recombinant ALV particles carrying the lacZ reporter gene.
• * Determined viral titers using appropriate assays.

Main Results:

• * Successfully generated packaging cells expressing ALV env subgroups B, C, and E.
• * Produced helper-free ALV particles containing the lacZ reporter gene and specific env subgroups (A, B, C, E).
• * Demonstrated that the titers of the recombinant lacZ virus are dependent on the env subgroup and the target avian cell type.

Conclusions:

• * The developed packaging cell lines provide a versatile system for producing specific ALV vectors.
• * This system facilitates the study of ALV envelope tropism and gene transfer efficiency.
• * Findings highlight the importance of env subgroup and target cell interactions in ALV-based gene delivery.