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Title

Erasure of CpG methylation in Arabidopsis alters patterns of histone H3 methylation in heterochromatin

Authors
Tariq, Muhammad
Saze, Hidetoshi
Probst, Aline V.
Lichota, Jacek
Habu, Yoshiki
Published in Proceedings of the National Academy of Sciences. 2003, vol. 100, no. 15, p. 8823-7
Abstract In mammals and plants, formation of heterochromatin is associated with hypermethylation of DNA at CpG sites and histone H3 methylation at lysine 9. Previous studies have revealed that maintenance of DNA methylation in Neurospora and Arabidopsis requires histone H3 methylation. A feedback loop from DNA methylation to histone methylation, however, is less understood. Its recent examination in Arabidopsis with a partial loss of function in DNA methyltransferase 1 (responsible for maintenance of CpG methylation) yielded conflicting results. Here we report that complete removal of CpG methylation in an Arabidopsis mutant null for DNA maintenance methyltransferase results in a clear loss of histone H3 methylation at lysine 9 in heterochromatin and also at heterochromatic loci that remain transcriptionally silent. Surprisingly, these dramatic alterations are not reflected in heterochromatin relaxation.
Keywords Arabidopsis/genetics/metabolismArabidopsis ProteinsCpG IslandsDNA (Cytosine-5-)-Methyltransferase/genetics/metabolismDNA MethylationDNA, Plant/chemistry/geneticsHeterochromatin/chemistry/geneticsHistones/chemistry/geneticsLysine/chemistry
Identifiers
PMID: 12853574
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TARIQ, Muhammad et al. Erasure of CpG methylation in Arabidopsis alters patterns of histone H3 methylation in heterochromatin. In: Proceedings of the National Academy of Sciences, 2003, vol. 100, n° 15, p. 8823-7. https://archive-ouverte.unige.ch/unige:6836

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Deposited on : 2010-06-10

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