Direct repeats surrounding the ribosomal RNA genes of Physarum polycephalum

Masahira Hattori*, Arar Ljljana, Yoshiyuki Sakaki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Sequence homology was found between the external transcribed spacer and the terminal non-transcribed spacer of Physarum polycephalum rDNA. The homologous sequences were located 2kb upstream from the 19S rRRA gene and 0.3kb downstream from 26S rRNA gene, respectively, and were arranged in a direct repeat manner. Sequence analyses showed that the direct repeats con sisted of two parts: one was sequences of about l3Obp which showed over 90% sequence homology with each other. The other consisted mainly of many tandem repeats of a 50̃52bp unit. The direct repeat-rRNA genes-direct repeat unit was found to be flanked by short direct repetitious sequences. Based on these findings, the significance of the direct repeat is discussed in terms of evolution of rDNA.

Original languageEnglish
Pages (from-to)2047-2053
Number of pages7
JournalNucleic Acids Research
Issue number4
Publication statusPublished - 1984 Feb 24
Externally publishedYes

ASJC Scopus subject areas

  • Statistics, Probability and Uncertainty
  • Applied Mathematics
  • Health, Toxicology and Mutagenesis
  • Toxicology
  • Genetics(clinical)
  • Genetics


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