High-level transgene expression by homologous recombination-mediated gene transfer
Open accessAbstract
Gene transfer and expression in eukaryotes is often limited by a number of stably maintained gene copies and by epigenetic silencing effects. Silencing may be limited by the use of epigenetic regulatory sequences such as matrix attachment regions (MAR). Here, we show that successive transfections of MAR-containing vectors allow a synergistic increase of transgene expression. This finding is partly explained by an increased entry into the cell nuclei and genomic integration of the DNA, an effect that requires both the MAR element and iterative transfections. Fluorescence in situ hybridization analysis often showed single integration events, indicating that DNAs introduced in successive transfections could recombine. High expression was also linked to the cell division cycle, so that nuclear transport of the DNA occurs when homologous recombination is most active. Use of cells deficient in either non-homologous end-joining or homologous recombination suggested that efficient integration and expression may require homologous recombination-based genomic integration of MAR-containing plasmids and the lack of epigenetic silencing events associated with tandem gene copies. We conclude that MAR elements may promote homologous recombination, and that cells and vectors can be engineered to take advantage of this property to mediate highly efficient gene transfer and expression.
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Inclusion of epigenetic elements can increase the number of clones that have integrated the transgene with a more defined copy number of transgene per cell, thus accelerating the selection process.
“Inclusion of these various epigenetic elements not only can help to increase the expression level of biotherapeutics, but can also increase the number of clones that have integrated the transgene with a more defined copy number of transgene per cell, thus accelerating the selection process (Grandjean et al., 2011;Harraghy et al., 2015).”
From Therapeutic glycoprotein production in mammalian cells (2017) · cites this paper as Grandjean et al., 2011
The Results section, “MAR elements increase the copy number of genome-integrated transgenes” (page not available), reports increased integration and higher copy numbers in CHO cell pools and individual clones with MAR-containing plasmids. It does not establish that more clones have a more defined copy number per cell or that clone selection is accelerated. (LLM, conf=0.84)
Experimental — accuracy not yet measuredInclusion of epigenetic elements can help increase the expression level of biotherapeutics.
“Inclusion of these various epigenetic elements not only can help to increase the expression level of biotherapeutics, but can also increase the number of clones that have integrated the transgene with a more defined copy number of transgene per cell, thus accelerating the selection process (Grandjean et al., 2011;Harraghy et al., 2015).”
From Therapeutic glycoprotein production in mammalian cells (2017) · cites this paper as Grandjean et al., 2011
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Liang, F., Han, M., Romanienko, P. J., & Jasin, M. (1998) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.95.9.5172 · Cited by 649 · see citing works
BRCA1 and BRCA2 and the genetics of breast and ovarian cancer
Welcsh, P. L. (2001) · Human Molecular Genetics · doi:10.1093/hmg/10.7.705 · Cited by 648 · see citing works
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Therapeutic glycoprotein production in mammalian cells
Lalonde, M.-E., & Durocher, Y. (2017) · Journal of Biotechnology · doi:10.1016/j.jbiotec.2017.04.028 · Cited by 296 · see citing works
Harraghy, N., Calabrese, D., Fisch, I., Girod, P., LeFourn, V., Regamey, A., & Mermod, N. (2015) · Biotechnology Journal · doi:10.1002/biot.201400649 · Cited by 32 · see citing works
Self-citation
- Authors
- Grandjean, M., Girod, P.-A., Calabrese, D., Kostyrko, K., Wicht, M., Yerly, F., Mazza, C., Beckmann, J. S., Martinet, D., & Mermod, N.
- Affiliations
- École Polytechnique Fédérale de Lausanne (CH)
- University of Fribourg (CH)
- Corresponding author
- Mermod, Nicolas
- Venue
- Nucleic Acids Research
- Publisher
- Oxford University Press (OUP)
- Published
- 2011-06-06
- Volume
- 39
- Issue
- 15
- Pages
- e104-e104
- ISSN
- 0305-1048 (ISSN-L)
- 1362-4962
- PMC
- PMC3159483
- OpenAlex
- W2018218652
- Cited by
- 53
- References
- 2
- Citations by year
- 2026: 1 · 2024: 2 · 2023: 4 · 2022: 4 · 2020: 3 · 2019: 2 · 2018: 4 · 2017: 2 · 2016: 5 · 2015: 9 · 2014: 5 · 2013: 8 · 2012: 2
- FWCI
- 3.39
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Nucleic Acids Research (publishedVersion, cc-by-nc)
- Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- RERO DOC (Universität Bern) (submittedVersion)
- reroDoc Digital Library (submittedVersion)
- IRIS (submittedVersion, other-oa)
- SERVAL (Université de Lausanne) (submittedVersion, other-oa)
- Funders
- Kommission für Technologie und Innovation
- Université de Lausanne
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
- Keywords
- homologous recombination, matrix attachment regions, transgene expression, epigenetic silencing, chromosomal integration, non-homologous end joining, cell cycle, tandem gene copies, plasmid vectors
- MeSH terms
- Animals, Cell Cycle, Cell Line, Cell Nucleus, DNA, Genetic Vectors, Plasmids, Recombination, Genetic, Sequence Homology, Nucleic Acid, Transfection, Gene Expression, Gene Dosage, Transgenes, Active Transport, Cell Nucleus, Matrix Attachment Regions
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