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J. Biol. Chem., Vol. 276, Issue 23, 20197-20205, June 8, 2001
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,
From the Biophysics Laboratories, Institute of Biomedical and
Biomolecular Sciences, Faculty of Science, University of Portsmouth,
Portsmouth PO1 2DT, United Kingdom
Affinity-purified polyclonal antibodies
recognizing the most highly acetylated forms of histones H3 and H4 were
used in immunoprecipitation assays with chromatin fragments derived
from 15-day chicken embryo erythrocytes by micrococcal nuclease
digestion. The distribution of hyperacetylated H4 and H3 was mapped at
the housekeeping gene, glyceraldehyde 3-phosphate dehydrogenase
(GAPDH), and the tissue-specific gene, carbonic
anhydrase (CA). H3 and H4 acetylation was found targeted to
the CpG island region at the 5' end of both these genes, falling off in
the downstream direction. In contrast, at the
A-globin
gene, both H3 and H4 are highly acetylated throughout the gene and at
the downstream enhancer, with a maximum at the promoter. Low level
acetylation was observed at the 5' end of the inactive ovalbumin gene.
Run-on assays to measure ongoing transcription showed that the
GAPDH and CA genes are transcribed at a much
lower rate than the adult
A-globin gene. The extensive
high level acetylation at the
A-globin gene correlates
most simply with its high rate of transcription. The targeted
acetylation of histones H3 and H4 at the GAPDH and CA genes is consistent with a role in transcriptional
initiation and implies that transcriptional elongation does not
necessarily require hyperacetylation.
Present address: Dept. of Biochemistry, University of Oxford,
South Parks Road, Oxford OX1 3QU, UK.
§
To whom correspondence should be addressed. Tel.:
44-23-92842055, Fax: 44-23-92842053; E-mail:
colyn.crane-robinson@port.ac.uk.
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