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  • Title: A new family of murine retroviral vectors with extended multiple cloning sites for gene insertion.
    Author: Faustinella F, Kwon H, Serrano F, Belmont JW, Caskey CT, Aguilar-Cordova E.
    Journal: Hum Gene Ther; 1994 Mar; 5(3):307-12. PubMed ID: 8018745.
    Abstract:
    Murine retroviral vectors with multiple unique cloning sites in the body and 3' long terminal repeat (LTR) are described. The various alterations to the vectors include changing the gag+ start codon (AUG) to a stop codon (UAA), a deletion of 468 bp from the envelope region, and an additional 387-bp deletion of the promoter and enhancer sequences from the 3' LTR. Multiple cloning sites in the body and 3' LTR facilitate double-copy vector construction. The hygromycin resistance and luciferase genes were subcloned into the body and 3' LTR to evaluate effects of vector modifications and effects of insert location (body vs. LTR and same orientation vs. reverse orientation with respect to the vector LTRs) on virus titer. The results indicate the modifications or insert position do not negatively influence potential vector titer and expression capacity. The described vectors have potentially useful characteristics for gene therapy studies.
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