Abstract: Disclosed are gene therapy vectors based on chimeric murine leukemia virus-feline immunodeficiency virus gene therapy vectors which are suitable for a wide variety of gene therapy applications. Also disclosed are related packaging cell lines, methods for production, and methods of use.

Abstract: This invention is related to adenoviral (Ad) vectors and their applications in the field of genetic medicine, including, but not limited to, gene vaccination, gene transfer, gene therapy, and the like. More specifically, this invention is related to the Ad vectors that carry the minimal cis-element of the Ad genome (minimal Ad vector) and are capable of delivering about 36 kb to about 38 kb of heterologous DNA. The generation and propagation of the minimal Ad vectors require trans-complementation of a packaging-attenuated and replication-defective helper Ad (helper) in an Ad helper cell line.

Abstract: Retroviral vector particle producing cells are provided, wherein the cell (a) has greater than 5 stably integrated copies of a retroviral vector construct; (b) produces greater than 10 infectious recombinant retroviral vector particles per cell per day; and (c) produces replication incompetent retroviral vector particles.

Abstract: Retroviral vector constructs are described which have a 5′ LTR, a tRNA binding site, a packaging signal, one or more heterologous sequences, an origin of second strand synthesis and a 3′ LTR, wherein the vector construct lacks retroviral gag/pol or env coding sequences. In addition, gag/pol, and env expression cassettes are described wherein the expression cassettes lack a consecutive sequence of more than 8 nucleotides in common. The above-described retroviral vector constructs, gag/pol and env expression cassettes may be utilized to construct producer cell lines which preclude the formation of replication competent virus.

Abstract: Retroviral vector constructs are described which have a 5' LTR, a tRNA binding site, a packaging signal, one or more heterologous sequences, an origin of second strand synthesis and a 3' LTR, wherein the vector construct lacks retroviral gag/pol or env coding sequences. In addition, gag/pol, and env expression-cassettes are described wherein the expression cassettes lack a consecutive sequence of more than 8 nucleotides in common. The above-described retroviral vector constructs, gag/pol and env expression cassettes may be utilized to construct producer cell lines which preclude the formation of replication competent virus.