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  • DNA methylation  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Transcriptional transgene silencing and chromatin components (2000)
    Springer
    Plant molecular biology 43 (2000), S. 221-234 
    Details
    ISSN: 1573-5028
    Keywords: chromatin remodelling ; DNA methylation ; epigenetics ; heterochromatin ; histone acetylation ; transcriptional silencing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Contrary to simplistic views that have long prevailed in genetics textbooks, gene transcription in higher organisms cannot be fully understood by analysing binding of transcription factors to DNA target sites within the promoter regions, just as it would be inappropriate to picture the genetic information within a nucleus as a simple string of DNA. Instead, DNA is embedded in a highly complex chromatin structure that controls the location and accessibility of individual genetic regions in a way we are still far from understanding in detail. What has become obvious, mainly due to ground-breaking research in yeast and animal systems, is that the packaging of certain genes into a chromosomal matrix is regulated via sophisticated chromatin remodelling mechanisms that define whether and when a gene becomes accessible to the transcription machinery. In plants, especially the analysis of transgenes and transposable elements has reminded us of the presence of epigenetic control mechanisms, which can affect the reliable expression of transgenes. There is increasing evidence that chromatin components play an important part in plant epigenetics. The purpose of this review is to describe the main general principles of chromatin remodelling as they have been elucidated in non-plant systems and to discuss their relevance for the control of gene expression in plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006483428789
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  • 2
    Electronic Resource
    Electronic Resource
    Endogenous and environmental factors influence 35S promoter methylation of a maize A1 gene construct in transgenic petunia and its colour phenotype (1992)
    Springer
    Molecular genetics and genomics 231 (1992), S. 345-352 
    Details
    ISSN: 1617-4623
    Keywords: A1 gene ; Petunia hybrida ; field experiment ; DNA methylation ; Environment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 30000 transgenic petunia plants carrying a single copy of the maize A1 gene, encoding a dihydroflavonol reductase, which confers a salmon red flower colour phenotype on the petunia plant, were grown in a field test. During the growing season plants with flowers deviating from this salmon red colour, such as those showing white or variegated phenotypes and plants with flowers exhibiting only weak pigmentation were observed with varying frequencies. While four white flowering plants were shown at the molecular level to be mutants in which part of the A1 gene had been deleted, other white flowering plants, as well as 13 representative plants tested out of a total of 57 variegated individuals were not mutants but rather showed hypermethylation of the 35S promoter directing A1 gene expression. This was in contrast to the homogeneous fully red flowering plants in which no methylation of the 35S promoter was observed. While blossoms on plants flowering early in the season were predominantly red, later flowers on the same plants showed weaker coloration. Once again the reduction of the A1-specific phenotype correlated with the methylation of the 35S promoter. This variation in coloration seems to be dependent not only on exogenous but also on endogenous factors such as the age of the parental plant from which the seed was derived or the time at which crosses were made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00292701
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    Paper (German National Licenses)
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