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  • Drosophila bifasciata  (2)
  • 1990-1994  (2)
  • 1
    Electronic Resource
    Electronic Resource
    P-related sequences inDrosophila bifasciata: A molecular clue to the understanding of P-element evolution in the genusDrosophila (1990)
    Springer
    Journal of molecular evolution 31 (1990), S. 478-484 
    Details
    ISSN: 1432-1432
    Keywords: P-element evolution ; Drosophila bifasciata ; Recent invasion hypothesis ; Horizontal gene transfer ; Sequence divergence ; Substitution rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two P-elements (bif1 and bif2) were isolated from a genomic library ofDrosophila bifasciata. Both elements are internally deleted and have lost the coding capacity for a functional transposase. One of the elements (bif2) contains an insert consisting of a repetitive sequence. The terminal inverted repeats and the segments necessary for passive mobility are well conserved. Element bif2 has retained rudiments of the coding sequence of exon 0 and exon 3, but the reading frame is destroyed by insertions and deletions. The comparison of theD. bifasciata P-elements with P-elements ofDrosophila melanogaster andDrosophila nebulosa reveals that the two latter sequences are more similar to each other than either of them is to theD. bifasciata elements. This finding contradicts the phylogenetic relationship of the species and can be taken as an indirect but unequivocal evidence for recent horizontal gene transfer from a relative ofD. nebulosa to the gene pool ofD. melanogaster. The P-elements ofD. bifasciata are phylogenetically ancient and have evolved independently for about 50 million years. A higher substitution rate at the third codon position as well as a predominance of conservative replacements at the amino acid level indicates that the P-elements ofD. bifasciata have been under selective constraint over a long period and that immobilization has occurred only recently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02102074
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  • 2
    Electronic Resource
    Electronic Resource
    Two distinct P element subfamilies in the genome of Drosophila bifasciata (1994)
    Springer
    Molecular genetics and genomics 244 (1994), S. 168-175 
    Details
    ISSN: 1617-4623
    Keywords: P element ; Transposon phylogeny ; Horizontal transfer ; Inverted repeats ; Drosophila bifasciata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The genome of Drosophila bifasciata harbours two distinct subfamilies of P-homologous sequences, designated M-type and O-type elements based on similarities to P element sequences from other species. Both subfamilies have some general features in common: they are of similar length (M-type: 2935 bp, O-type: 2986 bp), are flanked by direct repeats of 8 by (the presumptive target sequence), contain terminal inverted repeats, and have a coding region consisting of four exons. The splice sites are at homologous positions and the exons have the coding capacity for proteins of 753 amino acids (M-type) and 757 amino acids (O-type). It seems likely that both types of element represent functional transposons. The nucleotide divergence of the two P element subfamilies is high (31%). The main structural difference is observed in the terminal inverted repeats. Whereas the termini of M-type elements consist of 31 by inverted repeats, the inverted repeats of the O-type elements are interrupted by non-complementary stretches of DNA, 12 by at the 5′ end and 14 by at the 3′ end. This peculiarity is shared by all members of the O-type subfamily. Comparison with other P element sequences indicates incongruities between the phylogenies of the species and the P transposons. M-type and O-type elements apparently have no common origin in the D. bifasciata lineage. The M-type sequence seems to be most closely related to the P element from Scaptomyza pallida and thus could be considered as a more recent invader of the D. bifasciata gene pool. The origin of the O-type elements cannot be unequivocally deduced from the present data. The sequence comparison also provides new insights into conserved domains with possible implications for the function of P transposons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283519
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