Evidence map›Paper›PMID 22996197›Full record

ArticleGene therapy2013

Generation of an optimized lentiviral vector encoding a high-expression factor VIII transgene for gene therapy of hemophilia A.

J M Johnston, G Denning, C B Doering, H T Spencer

Open access · bronzeAbstract read
In one paragraph

Article in Gene therapy, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.

0numbers the graph read from it
0cells of the map it votes in
23citing papers in PubMed
2.9field-weighted citation impact, top 9% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

23 citing papers in PubMed, 33 citations in OpenAlex.

  1. Article
  2. Article
  3. Article
  4. Article
  5. Article
  6. Article
  7. Review
  8. Article
  9. Production of Therapeutic Enzymes by Lentivirus Transgenesis.Advances in experimental medicine and biology · 2019
    Review
  10. Article
  11. Article
  12. Target-Cell-Directed Bioengineering Approaches for Gene Therapy of Hemophilia A.Molecular therapy. Methods & clinical development · 2018
    Article
  13. Article
  14. Microfluidic Transduction Harnesses Mass Transport Principles to Enhance Gene Transfer Efficiency.Molecular therapy : the journal of the American Society of Gene Therapy · 2017
    Article
  15. Review
  16. Review
  17. Article
  18. Gene therapy for hemophilia.Frontiers in bioscience (Landmark edition) · 2015
    Review
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 3 institutions in 1 country.

J M JohnstonDepartment of Pediatrics, Aflac Cancer Center and Blood Disorders Service, Emory Children's Center, Emory University School of Medicine, Atlanta, GA 30322, USA.
G Denning
C B Doering
H T Spencer
Children's Center · USEmory University · USExpression Therapeutics (United States) · US

Funding

Hematopoietic gene therapy for hemophilia AR01HL092179 · NHLBI · EMORY UNIVERSITY · PI DOERING, CHRISTOPHER BRADLEY, SPENCER, H TRENT · 2009 to 2013
$1.9M
Bioengineered factor VIII gene therapy for hemophilia AR44HL114241 · NHLBI · EXPRESSION THERAPEUTICS · PI DENNING, GABRIELA, DOERING, CHRISTOPHER BRADLEY · 2014 to 2015
$1.5M
Bioengineered factor VIII gene therapy for hemophilia AR43HL114241 · NHLBI · EXPRESSION THERAPEUTICS · PI DENNING, GABRIELA, DOERING, CHRISTOPHER BRADLEY · 2012 to 2012
$378k
Ex Vivo Gene Therapy of Hemophilia AR41HL083531 · NHLBI · EXPRESSION THERAPEUTICS · PI DOERING, CHRISTOPHER BRADLEY · 2006 to 2006
$100k
NHLBI NIH HHS 5R01HL092179NHLBI NIH HHS R01 HL092179NHLBI NIH HHS R41 HL083531NHLBI NIH HHS R43 HL114241NHLBI NIH HHS R44 HL114241
6 · The paper itself

Abstract

We previously compared the expression of several human factor VIII (fVIII) transgene variants and demonstrated the superior expression properties of B domain-deleted porcine fVIII. Subsequently, a hybrid human/porcine fVIII molecule (HP-fVIII) comprising 91% human amino-acid sequence was engineered to maintain the high-expression characteristics of porcine fVIII. The bioengineered construct then was used effectively to treat knockout mice with hemophilia A. In the current study, we focused on optimizing self-inactivating (SIN) lentiviral vector systems by analyzing the efficacy of various lentiviral components in terms of virus production, transduction efficiency and transgene expression. Specifically, three parameters were evaluated: (1) the woodchuck hepatitis post-transcriptional regulatory element (WPRE), (2) HIV versus SIV viral vector systems and (3) various internal promoters. The inclusion of a WPRE sequence had negligible effects on viral production and HP-fVIII expression. HIV and SIV vectors were compared and found to be similar with respect to transduction efficiency in both K562s and HEK-293T cells. However, there was an enhanced expression of HP-fVIII by the SIV system, which was evident in both K562 and BHK-M cell lines. To further compare expression of HP-fVIII from an SIV-based lentiviral system, we constructed expression vectors containing the high expression transgene and a human elongation factor-1 alpha, cytomegalovirus (CMV) or phosphoglycerate kinase promoter. Expression was significantly greater from the CMV promoter, which also yielded therapeutic levels of HP-fVIII in hemophilia A mice. Based on these studies, an optimized vector contains the HP-fVIII transgene driven by a CMV internal promoter within a SIV-based lentiviral backbone lacking a WPRE.

Indexed as

Genetic TherapyHemophilia AAnimalsFactor VIIIGenetic VectorsGene Transfer TechniquesHEK293 CellsHumansLentivirusMicePromoter Regions, GeneticRecombinant ProteinsSwineTransduction, GeneticFactor VIIIRecombinant Proteins

Identifiers

PMID22996197
PMCPMC3552131
OpenAlexW2050347612

What OpenQuestion holds

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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.