Histone modifications associated with both A and B chromosomes of maize.
Chromosome Res
; 16(8): 1203-14, 2008.
Article
em En
| MEDLINE
| ID: mdl-18987983
ABSTRACT
We report the distribution of several histone modifications along the arms and in centromeric regions of somatic chromosomes of maize, including the supernumerary B chromosome. Acetylated H3 and H4 as well as H3K4me2, modifications associated with euchromatin, were enriched in the distal parts of the A chromosomes, but were progressively depleted toward the centromeres of the A chromosomes and were depleted in the heterochromatic portions of the B chromosome. Classical histone modifications associated with heterochromatin, including H3K9me2, H3K27me1 and H3K27me2, were distributed throughout both A and B chromosomes. However, H3K27me2 showed a reduced level on the B chromosome compared with the A chromosomes and was not associated with some classes of constitutive heterochromatin. We monitored the presence of each histone modification in the centromeric regions using a YFP-tagged centromere-specific histone, CENH3. We observed the presence of H3K9me2 and absence of H3K4me2 in the centromeric regions of both A and B chromosomes of maize, which is in contrast to the presence of H3K4me2 and absence of H3K9me2 in animal centromeres. These results show a diversity of epigenetic modifications associated with centromeric chromatin in different eukaryotes.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Cromatina
/
Histonas
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Zea mays
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Cromossomos de Plantas
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Epigênese Genética
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article