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  • 1
    ISSN: 1617-4623
    Schlagwort(e): Drosophila melanogaster ; Hybrid ; dysgenesis ; I factor ; Transposition ; Complementation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Non-LTR retrotransposons, also known as LINEs, transpose by reverse transcription of an RNA intermediate. Their mechanism of transposition is apparently different from that of retrotransposons and similar to that of proviruses of retroviruses. The I factor is responsible for the I-R system of hybrid dysgenesis inDrosophila melanogaster. Inducer strains contain several functional I factors whereas reactive strains do not. Transposition of I factors can be experimentally induced: they are stable in inducer strains, but transpose at high frequency in the germline of females, known as SF females, produced by crossing reactive females and inducer males. We have constructed an I element, calledIviP2, marked with thevermilion gene, the coding sequence of which was interrupted by an intron. Splicing of the intron can only occur in the transcript initiated from the I element promoter. Transposed copies expressing a wild-typevermilion phenotype were recovered in the germline of SF females in which I factors were actively transposing. This indicates thattrans-complementation of a defective I element, deficient for the second open reading frame, by functional I factors can occur in the germline of dysgenic females.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2000-03-24
    Beschreibung: One of the rewards of having a Drosophila melanogaster whole-genome sequence will be the potential to understand the molecular bases for structural features of chromosomes that have been a long-standing puzzle. Analysis of 2.6 megabases of sequence from the tip of the X chromosome of Drosophila identifies 273 genes. Cloned DNAs from the characteristic bulbous structure at the tip of the X chromosome in the region of the broad complex display an unusual pattern of in situ hybridization. Sequence analysis revealed that this region comprises 154 kilobases of DNA flanked by 1.2-kilobases of inverted repeats, each composed of a 350-base pair satellite related element. Thus, some aspects of chromosome structure appear to be revealed directly within the DNA sequence itself.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Benos, P V -- Gatt, M K -- Ashburner, M -- Murphy, L -- Harris, D -- Barrell, B -- Ferraz, C -- Vidal, S -- Brun, C -- Demailles, J -- Cadieu, E -- Dreano, S -- Gloux, S -- Lelaure, V -- Mottier, S -- Galibert, F -- Borkova, D -- Minana, B -- Kafatos, F C -- Louis, C -- Siden-Kiamos, I -- Bolshakov, S -- Papagiannakis, G -- Spanos, L -- Cox, S -- Madueno, E -- de Pablos, B -- Modolell, J -- Peter, A -- Schottler, P -- Werner, M -- Mourkioti, F -- Beinert, N -- Dowe, G -- Schafer, U -- Jackle, H -- Bucheton, A -- Callister, D M -- Campbell, L A -- Darlamitsou, A -- Henderson, N S -- McMillan, P J -- Salles, C -- Tait, E A -- Valenti, P -- Saunder, R D -- Glover, D M -- New York, N.Y. -- Science. 2000 Mar 24;287(5461):2220-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton Hall, Cambridge CB10 1SD, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10731137" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Chromosome Banding ; Computational Biology ; Cosmids ; DNA Transposable Elements ; DNA, Satellite ; Drosophila melanogaster/*genetics ; Genes, Insect ; In Situ Hybridization ; Repetitive Sequences, Nucleic Acid ; Sequence Analysis, DNA ; X Chromosome/*genetics/ultrastructure
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1980-02-08
    Beschreibung: Several dysgenic traits may occur within the Drosophila melanogaster species as a result of crosses between different strains. Crossing two mutually interacting categories, named inducer and reactive, may lead, among other abnormalities, to a specific kind of female sterility that has proved useful for investigating the genetic factors involved in the interaction. The reactive state appears to result from a cytoplasmic state ultimately controlled by a chromosomal polygenic system. The inducer character is determined by a chromosomal factor that exhibits all characteristics of a transposable element. Overall, the data contribute to clarification of mutator activities in D. melanogaster and open new opportunities to investigate unusual genetic mechanisms.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bregliano, J C -- Picard, G -- Bucheton, A -- Pelisson, A -- Lavige, J M -- L'Heritier, P -- New York, N.Y. -- Science. 1980 Feb 8;207(4431):606-11.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6766221" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Aging ; Animals ; Animals, Laboratory/genetics ; Animals, Wild/genetics ; Cytoplasm/physiology ; Drosophila melanogaster/*genetics ; Ecology ; Female ; Genes, Regulator ; Hot Temperature ; Hybridization, Genetic ; Infertility, Female/genetics ; Mutation ; Oocytes/physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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