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Nucleic Acids Research, 1984, Vol. 12, No. 17 6861-6869
© 1984

MOLECULAR BIOLOGY

Introns and their flanking sequences of Bombyx mori rDNA

Haruhiko Fujiwara*, Teru Ogura, Naoko Takada, Naoko Miyajima, Hajime Ishikawa* and Hideaki Maekawa+

Department of Technology, National Institute of Health Kamiosaki, Shinagawa-ku, Tokyo 141, Japan *Department of Biology, College of Arts and Sciences, University of Tokyo Komaba, Meguro-ku, Tokyo 153, Japan

+To whom correspondence should be addressed

Received June 14, 1984. Revised August 10, 1984. Accepted August 10, 1984.

We obtained two different clones (16 kb and 13 kb) of B. mori rDNA with intron sequence within the 28S-rRNA coding region. The sequence surrounding the intron was found to be highly conserved as indicated in several eukaryotes (Tetrahymena, Drosophila and Xenopus). The 28S rRNA-coding sequence of 16 kb and 13 kb clone was interrupted at precisely the same sites as those where the D. melanogaster rDNA interrupted by the type I and type II intron, respectively. The intron sequences of B. mori were different from those of D. melanogaster. In 16 kb clone, the intron was flanked by 14 bp duplication of the junction sequence, which was also present once within the 28S rRNA-coding region of rDNA without intron. This 14 bp sequence was identical with those surrounding the introns of Dipteran rDNAs.


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