Cited by 94Epigenetics and DNA MethylationChromosomal and Genetic VariationsGenomics and Chromatin Dynamics

Suppressors of transcriptional transgenic silencing in Chlamydomonas are sensitive to DNA-damaging agents and reactivate transposable elements

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Jeong, Byeong-ryool, Wu-Scharf, Dancia, Zhang, Chaomei, Cerutti, Heriberto·2002·Proceedings of the National Academy of Sciences

Abstract

In the unicellular green alga Chlamydomonas reinhardtii , the epigenetic silencing of transgenes occurs, as in land plants, at both the transcriptional and posttranscriptional levels. In the case of single-copy transgenes, transcriptional silencing takes place without detectable cytosine methylation of the introduced DNA. We have isolated two mutant strains, Mut-9 and Mut-11, that reactivate expression of a transcriptionally silenced single-copy transgene. These suppressors are deficient in the repression of a DNA transposon and a retrotransposon-like element. In addition, the mutants show enhanced sensitivity to DNA-damaging agents, particularly radiomimetic chemicals inducing DNA double-strand breaks. All of these phenotypes are much more prominent in a double mutant strain. These observations suggest that multiple partly redundant epigenetic mechanisms are involved in the repression of transgenes and transposons in eukaryotes, presumably as components of a system that evolved to preserve genomic stability. Our results also raise the possibility of mechanistic connections between epigenetic transcriptional silencing and DNA double-strand break repair.

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  • In Chlamydomonas, researchers have encountered problems with transgene silencing.

    “In Chlamydomonas, researchers have encountered problems with transgene silencing [115].”

    From Biofuels from algae: Challenges and potential (2010) · cites this paper as [115]

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  1. [31]Tian L, Chen Z J. Proc Natl Acad Sci USA. 2001;98:200–205. doi: 10.1073/pnas.011347998. . (First Published December 26, 2000; 10.1073/pnas.011347998) [DOI] [PMC free article] [PubMed] [Google Scholar] · DOI

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Authors
Jeong, B.-R., Wu-Scharf, D., Zhang, C., & Cerutti, H.
Affiliations
  • University of Nebraska–Lincoln (US)
  • School of Biological Sciences and Plant Science Initiative, University of Nebraska, E211 Beadle Center, Post Office Box 880666, Lincoln, NE 68588-0666
Venue
Proceedings of the National Academy of Sciences
Published
2002-01-08
Volume
99
Issue
2
Pages
1076-1081
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2083491633
Cited by
94
References
67
Citations by year
2026: 1 · 2025: 2 · 2024: 3 · 2023: 5 · 2022: 4 · 2021: 7 · 2020: 5 · 2019: 4 · 2018: 1 · 2017: 5 · 2016: 1 · 2015: 5 · 2014: 2 · 2013: 2
FWCI
3.24
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Lincoln (University of Nebraska) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Chromosomal and Genetic Variations
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
transcriptional silencing, epigenetic silencing, transgene silencing, Chlamydomonas reinhardtii, DNA transposons, retrotransposons, transposon reactivation, DNA-damaging agents, DNA double-strand breaks, genome stability, cytosine methylation
MeSH terms
Animals, Bleomycin, DNA Damage, DNA Transposable Elements, DNA Repair, Biological Evolution, Methyl Methanesulfonate, Mutation, Suppression, Genetic, Transcription, Genetic, Chlamydomonas reinhardtii, Genes, Protozoan, Genes, Plant, Gene Silencing

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