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KMID : 0578319920020030315
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Molecules and Cells
1992 Volume.2 No. 3 p.315 ~ p.320
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Effect of the 3´ Flanking Sequence of Rat β-Casein and Human Growth Hormone Genes on Gene Expression in mammary Epithelial Cells
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Yu, Dae-Yeul
Lee, Chul-Sang/Han, Yong-Man/Kang, Man-Jong/Lee, Kyung-Kwang
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Abstract
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We constructed the putative secondary structures of the small subunit rRNAs (SSU rRNA) from three strepsipteran insects.
The primary sequences of the strepsipteran SSU rRNAs are unusually long due to unique and long insertions.
In spite of these insertions, the basic shapes of their secondary structures are well maintained as shown in those of other eukaryotes, because these insertions appear mainly in the variable regions.
The secondary structures for the Ⅴ1,Ⅴ5, and Ⅴ8 regions are quite variable.
However, the predicted secondary structures for the Ⅴ2,Ⅴ4 and Ⅴ7 regions are quite different from those of other insects.
In the Ⅴ4 and Ⅴ7 regions, helices specific to the Strepsiptera exist.
These helices have not been reported in other organisms so far.
Similarly, four eukaryotic specific helices (E8-1, E10-2, E23-4 and E45-1) not reported in insects exist in the Ⅴ2,Ⅴ4, and Ⅴ8 regions.
These helices are formed by the inserted sequences.
The secondary structures of the expanded segments of the strepsipteran SSU rRNA were applied to infer the phylogenetic position of Strepsiptera, one of the most enigmatic problems in insect phylogeny.
Only the secondary structure of the Ⅴ7 region showed the weak Strepsiptera/Diptera sister-group relationship.
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