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- W2134131007 abstract "The methylated H3 histone and heterochromatin protein 1 (HP1) are markers of heterochromatin in several eukaryotes possessing monocentric chromosomes. In order to confirm that these epigenetic markers of heterochromatin are evolutionary con- served, the distribution of methylated H3 histones and HP1 homologues on the holocentric chromosomes of the cabbage moth Mamestra brassicae (Lepidoptera) were studied. In particular, PCR experiments with degenerated primers identified a HP1 homo- logue (called MbHP1) in the M. brassicae genome. Sequencing showed that the MbHP1 gene is 737 bp long including a 102 bp 5'UTR and a 635 bp coding portion (comprising an 80 bp intron). The MbHP1 peptide consisted of 184 amino acids, had a 20 kDa molecular mass and a net negative charge. At the structural level, it showed an N terminal chromo-domain and a chromo-shadow- -domain at the C terminus linked by a short hinge region. At the cytogenetic level, MbHP1 was located exclusively in the hetero- chromatic regions of the chromosomes. The same heterochromatic regions became labelled after immuno-staining with antibodies against H3 histone methylated at lysine 9, reinforcing the hypothesis that this modified histone is essential for HP1 binding. Our data, as a whole, confirm that heterochromatic components and markers are evolutionary conserved both in mono- and holocentric chromosomes despite the difference in the distribution of heterochromatin on chromosomes." @default.
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- W2134131007 date "2005-11-03" @default.
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- W2134131007 title "Conservation of HP1 and methylated H3 histones as heterochromatic epigenetic markers in the holocentric chromosomes of the cabbage moth, Mamestra brassicae (Lepidoptera)" @default.
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