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Nucleic Acids Research, 1983, Vol. 11, No. 6 1725-1734
© 1983

MOLECULAR BIOLOGY

Nucleotide sequence of the transcriptions initiation region of Dictyostelium discoideum rRNA gene and comparison of the initiation regions of three lower eukaryotes’genes

Yoshiko Hoshikawa, Yoichi Iida* and Masaki lwabuchi

*Department of Chemistry II, Faculty of Science, Hokkaido University Sapporo 060, Japan Department of Botany Sapporo 060, Japan

Received January 17, 1983. Accepted February 18, 1983.

The 5’ end of the rRNA precursor of D. discoideumwas mapped on a cloned rDNA by S1 nuclease protection mapping, and the sequence of about 1240 nucleotides surrounding the transcriptional initiation site of the rRNA gene has been determined. Repeated sequences consisting of 16 nucleotides appeared in the region upstream from the initiation point. Comparison of the nucleotide sequences around the initiation site of rRNA genes in three lower eukaryotes, D. discoideum, Saccharomyces cerevisiaeand Terahymena pyriformis,indicated that there was little similarity in the nontranscribed spacer regions, but in the transcribed spacer regions near the initiation point, very similar sequences consisting of 9 nucleotides were found.


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