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J Biol Chem, Vol. 273, Issue 33, 20693-20696, August 14, 1998
,
From the The relationship between histone acetylation and
transcription of the Xenopus laevis oocyte and somatic 5 S
ribosomal RNA genes was investigated. Chromatin fragments from a
X. laevis kidney cell line were immunoprecipitated with an
antibody specific for hyperacetylated histone H4. The DNA from the
hyperacetylated chromatin was probed with both oocyte- and somatic
gene-specific sequences, and the results showed that the upstream,
nontranscribed region of the transcriptionally active somatic genes is
packaged with acetylated histone H4. In contrast, the corresponding
region of the transcriptionally silent oocyte genes is packaged with
hypoacetylated histone H4 in this cells line. Further study also showed
that this region of the oocyte genes was less sensitive to digestion with the enzyme, micrococcal nuclease. Together these results suggest
that, as described for both RNA polymerase I and II transcribed genes,
there is a correlation between histone acetylation and transcription of
the RNA polymerase III transcribed 5 S ribosomal RNA genes in X. laevis.
Department of Biochemistry and Microbiology,
University of Victoria, Victoria, British Columbia V8W 3P6, Canada and
the § Department of Biology, University of Rochester,
Rochester, New York 14627
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