Lentiviral vectors carrying synthetic bi-directional promoters and uses thereof
It is described a bidirectional promoter for expression of at least two coding sequences in opposite direction in animal cells; bidirectional expression cassettes; expression constructs; gene transfer expression vectors, and methods for the use thereof.
1. A synthetic bidirectional promoter for expression of at least two coding sequences in opposite direction in animal cells comprising 5′ end to 3′ end:
a) a first minimal promoter sequence of cytomegalovirus (CMV) or mouse mammary tumor virus (MMTV) genomes;
b) a promoter sequence of an animal gene comprising an enhancer region and a second minimal promoter sequence;
the promoter sequences a) and b) driving a coordinate transcription of at least two coding sequences in the opposite orientation, and
wherein the synthetic bidirectional promoter is endogenously regulated.
2. The bidirectional promoter according to claim 1 wherein the animal gene is a ubiquitously expressed gene comprising the phosphoglycerate kinase gene or the ubiquitin gene.
3. A bidirectional expression cassette comprising the bidirectional promoter according to claim 1 , insertion sites positioned downstream to each of the promoter sequences a) and b), and polyadenylation sites positioned downstream to each of the insertion sites, wherein at least one transcriptional regulatory element is positioned upstream to one or each of the polyadenylation sites.
4. The bidirectional expression cassette according to claim 3 further comprising at least one internal ribosome entry site (IRES) sequence to express three or more genes.
5. An expression construct containing the bidirectional promoter according to claim 1 .
6. An expression construct containing the bidirectional expression cassette according to claim 3 .
7. A gene transfer expression vector containing the expression construct according to claim 5 further comprising lentiviral or retroviral sequences.
8. A method for the delivery and expression of multiple genes in animal cells comprising transforming the animal cells ex vivo with the gene transfer vector according to claim 7 ; and expressing the genes ex vivo.
9. The method according to claim 8 wherein the animal cells are tissue animal cells.
10. The method according to claim 9 wherein the tissue animal cells are brain neurons.
11. A method for the coordinate expression of two exogeneous coding sequences in an animal cell comprising the following steps:
a) cloning two exogeneous coding sequences into the gene transfer expression vector according to claim 7 , each coding sequence under the control of one of the promoter sequences a) and b) of the bidirectional promoter:
b) transforming animal cells with the cloned vector; and
c) expressing the cloned vector.
12. The method for the coordinate expression of two exogeneous coding sequences according to claim 11 wherein the animal cell is a human cell.
13. The method for the coordinate expression of two exogeneous coding sequences according to claim 12 wherein the human cell is a retransplantable human cell.
14. The method for the coordinate expression of two exogeneous coding sequences according to claim 13 wherein the retransplantable human cell is an hematopoietic cell.
15. A method for generating a transgenic non-human organism comprising the step of transforming non-human animal cells with an expression construct containing the bidirectional expression cassette according to claim 3 .
16. A method for generating a transgenic non-human organism comprising the step of transforming non-human animal cells with the gene transfer expression vector according to claim 7 .