The vagaries of variegating transgenes
Abstract
Expression of transgenes in mice, when examined with assays that can distinguish individual cells, is often found to be heterocellular, or variegated. Line‐to‐line variations in expression of a transgene may be due largely to differences in the proportion of cells in which it is expressed. Variegated silencing by centromeric heterochromatin is well described, but other factors may also affect transgene silencing in mice. Tandem arrays of transgenes themselves form heterochromatin, and some cell lineages may tend to silence transgenes because of extensive facultative heterochromatin in their nuclei. The cis‐acting transcriptional control elements within a transgene inhibit silencing, and strainspecific differences in chromatin proteins may strongly influence the extent of variegation. The accessibility of multiple differentiated cell lineages in mice suggests that they may provide a tool for dissecting the role of chromatin‐mediated silencing in cell differentiation and tissue‐specific gene expression.
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One of the hallmarks of epigenetic gene silencing across all multicellular organisms from plants to humans is the stochastic nature by which they operate.
“One of the hallmarks of epigenetic gene silencing across all multicellular organisms from plants to humans is the stochastic nature by which they operate [45]”
From A genome-wide screen for modifiers of transgene variegation identifies genes with critical roles in development (2008) · cites this paper as [45]
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- Authors
- Martin, D. I. K., & Whitelaw, E.
- Affiliations
- University of Washington (US)
- The University of Sydney (AU)
- Corresponding author
- Martin, David I. K.
- Whitelaw, Emma
- ORCID
- Whitelaw, Emma
- Venue
- BioEssays
- Publisher
- Wiley
- Published
- 1996-11
- Volume
- 18
- Issue
- 11
- Pages
- 919-923
- ISSN
- 0265-9247 (ISSN-L)
- 1521-1878
- OpenAlex
- W2105554972
- Cited by
- 160
- References
- 47
- Citations by year
- 2025: 2 · 2024: 1 · 2022: 4 · 2021: 2 · 2020: 1 · 2019: 6 · 2018: 1 · 2017: 2 · 2016: 4 · 2015: 2 · 2014: 3 · 2013: 7 · 2012: 2
- FWCI
- 1.02
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- BioEssays (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (5r01hl048790-08)
- National Health and Medical Research Council
- National Medical Research Council
- National Heart, Lung, and Blood Institute (5RO1HL48790)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Animal Genetics and Reproduction
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
- Keywords
- transgene silencing, heterochromatin, centromeric heterochromatin, facultative heterochromatin, chromatin proteins, cell differentiation, tissue-specific gene expression, transgenic mice
- MeSH terms
- Animals, Cell Differentiation, Centromere, Gene Expression Regulation, Heterochromatin, Mice, Inbred CBA, Mice, Inbred C57BL, Mice, Transgenic, Transcription Factors, Gene Expression Regulation, Developmental, Cell Lineage, Transgenes, Mice
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