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Nucleic Acids Research, 1984, Vol. 12, No. 4 2225-2232
© 1984

MOLECULAR BIOLOGY

In vitro methylation of HpaII sites In Xenpus laevzs rDNA does not affect its transcription in oocytes

David G. Pennock and Ronald H. Reeder

Fred Hutchinson Cancer Research Center 1124 Columbia Street, Seattle, WA 98104 Department of Zoology, University of Washington Seattle, WA 98195, USA

Received October 11, 1983. Revised January 17, 1984. Accepted January 17, 1984.

The effect of methylation of X. laevis rDNA on its transcription was tested by methylating all of the BpaII sites in a series of rDNA plasmids and injecting the methylated rDNA into X. borealis oocytes. Analysis of RNA transcribed from the injected plasmids showed that methylation of rDNA in vitro does not affect transcription of X. laevis ribosomal genes. This result suggests that despite the observed correlation between demethylation of rDNA and synthesis of ribosomal RNA in X. laevis embryos (1), methylation of rDNA does not regulate transcription of the gene.


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