2005
DOI: 10.1038/sj.gt.3302698
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Woodchuck hepatitis virus post-transcriptional regulatory element deleted from X protein and promoter sequences enhances retroviral vector titer and expression

Abstract: Introduction of the post-transcriptional regulatory element (PRE) of woodchuck hepatitis virus (WHV) into the 3 0 untranslated region of retroviral and lentiviral gene transfer vectors enhances both titer and transgene expression. Optimal use of the PRE is often necessary to obtain vectors with sufficient performance for therapeutic applications. The enhancing activity of the PRE depends on the precise configuration of its sequence and the context of the vector and cell into which it is introduced. However, da… Show more

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Cited by 127 publications
(122 citation statements)
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“…A safe and functional PRE was designed by deleting the 3 0 region to remove all remnants of the X protein or its promoter and to mutate the remaining ATGs throughout the element to remove any putative ORF larger than 25 AA. 21 Such minimal PRE functions effectively to increase viral titer and to enhance gene expression in gammaretroviral and LVs. To our knowledge, it has not yet been reported how this truncated WPRE compares in the long run with the native element in in vivo gene therapy models.…”
Section: Discussionmentioning
confidence: 99%
“…A safe and functional PRE was designed by deleting the 3 0 region to remove all remnants of the X protein or its promoter and to mutate the remaining ATGs throughout the element to remove any putative ORF larger than 25 AA. 21 Such minimal PRE functions effectively to increase viral titer and to enhance gene expression in gammaretroviral and LVs. To our knowledge, it has not yet been reported how this truncated WPRE compares in the long run with the native element in in vivo gene therapy models.…”
Section: Discussionmentioning
confidence: 99%
“…To construct a SIN design and to insert a unique SnaBI site (for the insertion of fragments into the ⌬U3 deletion), the overlap primers 3Ј ASLVsin OL (5Ј-AATACAATATCTCTACG TACAAGAGTATTGCATAAGACTACATTTCC-3Ј) and 5Ј ASLVsin OL (5Ј-TATGCAATACTCTTGTACGTAGAGATATTGTATTTAAGTGCCTAGC-3Ј) were used together with the two primers mentioned above. The 5Ј LTR and leader fragment (SphI/NheI) and the 3Ј LTR fragment (HindIII/XhoI) were inserted into a gammaretroviral SIN vector (pSERS11.SF.GFPpre*) backbone harboring a spleen focus-forming virus (SFFV)-driven enhanced green fluorescent protein (EGFP) expression cassette with the safety-optimized posttranscriptional regulatory element of woodchuck hepatitis virus (wPRE) (30,33). This resulted in the alpharetroviral plasmids pAlpha.SF.EGFP.wPRE (with an intact 3Ј U3 region) and pAlpha.SIN.SF.EGFP.wPRE (with a 3Ј SIN deletion).…”
Section: Alpharetroviral Vectors and Plasmidsmentioning
confidence: 99%
“…The human embryonic kidney cell line 293T, the human fibroblast line HT1080, and the murine fibroblast line SC1 were cultured in Dulbecco's modified Eagle's medium (DMEM) with stable glutamine (Biochrom, Berlin, Germany) supplemented with 10% fetal calf serum (FCS), 100 U/ml penicillin-100 g/ml streptomycin, and 1 mM sodium pyruvate (all from PAA Laboratories, Pasching, Austria). Alpharetroviral supernatants were produced after transient transfection of 293T cells as previously described for gammaretroviral and lentiviral vectors (5,30,32,33) using ecotropic, amphotropic, gibbon ape leukemia virus (GALV), GALV-TR (cytoplasmically modified), VSVg, or RD114-TR envelopes. Briefly, 5 ϫ 10 6 293T cells were seeded the day before transfection.…”
Section: Alpharetroviral Vectors and Plasmidsmentioning
confidence: 99%
“…La séquence isolatrice présente aussi un deuxième intérêt qui est de protéger le promoteur interne d'une possible méthylation et donc de l'extinction de l'expression du transgène à long terme. Enfin, le remplacement de la séquence sauvage par une séquence PRE mutée plus sécurisée est préférable [24]. En conclusion, l'efficacité de la thérapie génique est bien démontrée dans ce modèle murin de PEC.…”
Section: Receveurs Pec Secondairesunclassified