Negative and positive effects of CpG-methylation on Xenopus ribosomal gene transcription in vitro.

Abstract:

:Methylation of cytosine-residues in the sequence CpG affects the expression of many genes and generally correlates with reduced transcription. The ribosomal genes of Xenopus laevis were among the first genes to be studied with respect to their DNA methylation, and a loss of methylation during embryonic development correlated with the onset of transcription. Nevertheless, highly methylated ribosomal genes were transcribed at normal levels when injected into oocyte nuclei, and thus transcription of these genes was generally assumed to be insensitive to CpG-methylation. Here I show that Xenopus ribosomal gene transcription can be repressed by cellular factors binding to meCpG, similarly as it has been described for transcription by RNA polymerase II. In the absence of these repressors, however, CpG-methylation has a direct positive effect on RNA polymerase I-promoter activity.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Labhart P

doi

10.1016/0014-5793(94)01291-1

subject

Has Abstract

pub_date

1994-12-19 00:00:00

pages

302-6

issue

2-3

eissn

0014-5793

issn

1873-3468

pii

0014-5793(94)01291-1

journal_volume

356

pub_type

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