Homogeneity and persistence of transgene expression by omitting antibiotic selection in cell line isolation
Nonuniform, mosaic expression patterns of transgenes are often linked to transcriptional silencing, triggered by epigenetic modifications of the exogenous DNA. Such phenotypes are common phenomena in genetically engineered cells and organisms. They are widely attributed to features of transgenic tra...
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Published in | Nucleic acids research Vol. 36; no. 17; p. e111 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
England
Oxford University Press
01.10.2008
Oxford Publishing Limited (England) |
Subjects | |
Online Access | Get full text |
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Summary: | Nonuniform, mosaic expression patterns of transgenes are often linked to transcriptional silencing, triggered by epigenetic modifications of the exogenous DNA. Such phenotypes are common phenomena in genetically engineered cells and organisms. They are widely attributed to features of transgenic transcription units distinct from endogenous genes, rendering them particularly susceptible to epigenetic downregulation. Contrary to this assumption we show that the method used for the isolation of stably transfected cells has the most profound impact on transgene expression patterns. Standard antibiotic selection was directly compared to cell sorting for the establishment of stable cells. Only the latter procedure could warrant a high degree of uniformity and stability in gene expression. Marker genes useful for the essential cell sorting step encode mostly fluorescent proteins. However, by combining this approach with site-specific recombination, it can be applied to isolate stable cell lines with the desired expression characteristics for any gene of interest. |
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Bibliography: | ark:/67375/HXZ-S7XPT6PN-0 istex:3318C54506DC5F0AAA1E5D30B1EF20069E8C339E Present address: Weimin L. Kaufman, Center for Pediatric Biomedical Research, University of Rochester, 601 Elmwood Ave., Rochester, NY 14642, USA ArticleID:gkn508 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1 The authors wish it to be known that, in their opinion, the first two authors should be regarded as joint First Authors |
ISSN: | 0305-1048 1362-4962 |
DOI: | 10.1093/nar/gkn508 |