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  • 1
    Electronic Resource
    Electronic Resource
    Nucleotide sequence and presumed secondary structure of the 28S rRNA of pea aphid implication for diversification of insect rRNA (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 469-475 
    Details
    ISSN: 1432-1432
    Keywords: Aphid ; 28S rRNA ; Secondary structure model ; G + C content ; Variable region ; Divergent evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02337519
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  • 2
    Electronic Resource
    Electronic Resource
    Nucleotide composition and kinetic complexity of the genomic DNA of an intracellular symbiont in the pea aphidAcyrthosiphon pisum (1987)
    Springer
    Journal of molecular evolution 24 (1987), S. 205-211 
    Details
    ISSN: 1432-1432
    Keywords: Endosymbiont ; Aphid ; Genome size ; Nucleotide composition ; Cell organelle ; Mycoplasma ; Escherichia coli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An intracellular symbiont was isolated from the mycetocyte of the pea aphidAcyrthosiphon pisum, and its genomic DNA was compared with those ofEscherichia coli andMycoplasma capricolum with respect to nucleotide composition and kinetic complexity. Thermal dissociation, CsCl density equilibrium centrifugation, and high-performance liquid chromatography of the nuclease P1 digest all indicated that the G+C content of the endosymbiont DNA is as low as 30%. In this respect, the endosymbiont resembledMycoplasma species. The reassociation kinetics of genomic DNA labeled by nick translation suggested that the endosymbiont genome is 1.4×1010 daltons in size, about 5 and 18 times as large as those ofE. coli andM. capricolum, respectively. The results were confirmed by reassociation of endosymbiont DNA labeled by incubation with [3Hthymidine in Grace's medium. The endosymbiont genome of the aphid was about 500 times larger than those of leafhopper endosymbionts previously analyzed by ultracentrifugation. These characteristic properties of the aphid endosymbiont genome are discussed in connection with the evolution of cell organelles, and with reference to a previous finding that most of the genes of the aphid endosymbiont are not expressed when present intracellularly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02111233
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  • 3
    Electronic Resource
    Electronic Resource
    What causes the aphid 28S rRNA to lack the hidden break? (1990)
    Springer
    Journal of molecular evolution 30 (1990), S. 509-513 
    Details
    ISSN: 1432-1432
    Keywords: Aphid ; 28S rRNA ; Hidden break ; Gap region ; Stem-loop structure ; UAAU tract ; Protostomes ; Deuterostomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In order to determine why the aphid 28S rRNA lacks the hidden break otherwise found in insects, the structure of the region of the aphid ribosomal DNA (rDNA) corresponding to the gap region, which in other insect rDNA transcripts is excised posttranscriptionally, was studied. Sequence comparison suggested that, in contradistinction to what is found in rDNA transcripts of other insects, a stem-loop structure formed in this region of the aphid rDNA transcript is not AU-rich. Nor did the loop of the aphid molecule contain the UAAU tract that can be a signal for the introduction of the hidden break, suggesting that in this particular region the aphid 28S rRNA resembles 28S rRNAs of deuterostomes, which do not contain the hidden break.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101106
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  • 4
    Electronic Resource
    Electronic Resource
    Accumulation of adenine and thymine in agroE-homologous operon of an intracellular symbiont (1993)
    Springer
    Journal of molecular evolution 36 (1993), S. 121-126 
    Details
    ISSN: 1432-1432
    Keywords: Aphid ; Intracellular symbiont ; groE operon ; Nucleotide sequence ; Codon usage ; Directional mutation ; A/T pressure ; Selection ; Cell organelles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary As a result of the nucleotide sequence analysis of an aphid endosymbiont's operon homologous to theEscherichia coli groE, we noted that directional base substitutions tending toward an increase of A + T content represent an obvious evolutionary trend in this prokaryotic operon, housed for a long period by an eukaryotic cell. This result, when taken together with previous reports, raised the possibility that genomic DNA of prokaryotes residing in an eukaryotic cell is subject to A/T-biased directional mutation pressure and/or both negative and positive selection operating under conditions specific to the intracellular environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166247
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