Nucleotide sequence and presumed secondary structure of the 28S rRNA of pea aphid implication for diversification of insect rRNA |
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| Authors: | Daisuke Amako O-Yu Kwon Hajime Ishikawa |
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| Institution: | (1) Department of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo, Bunkyo-ku, 113 Tokyo, Japan;(2) Present address: Department of Agricultural Biology, Kyungpook National University, TaeGu, Korea |
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| Abstract: | Determination of the entire nucleotide sequence of the aphid 28S ribosomal RNA gene (28S rDNA) revealed that it is 4,147 by
in length with a G + C content of 60.3%. Based on the nucleotide sequence, we constructed a presumed secondary-structure model
of the aphid 28S rRNA which indicated that the aphid 28S rRNA is characterized by the length and high G + C content of its
variable regions. The G + C content of the aphid's variable regions was much higher than that of the entire sequence of the
28S rRNA, which formed a striking contrast to those ofDrosophila with the G + C content much lower than the entire 28S molecule. In this respect, the aphid 28S rRNA somewhat resembled those
of vertebrates. This is the third report of a complete large-subunit rRNA sequence from an arthropod, and the first 28S rRNA
sequence for a nondipterous insect.
Correspondence to: H. Ishikawa |
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| Keywords: | Aphid 28S rRNA Secondary structure model G + C content Variable region Divergent evolution |
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