TAILIEUCHUNG - Báo cáo sinh học: "Homologous sequences transposable element in Drosophila subobscura"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Homologous sequences transposable element in Drosophila subobscura | 307 Genet Sei Evol 1990 22 307-316 Elsevier INRA Original article Homologous sequences to the p transposable element in Drosophila subobscura N Paricio L Pascual MJ Martinez-Sebastian M Pérez-Alonso R de Frutos Universidad de Valencia Facultad de Ciencias Biológicas _ . Departamento de Genétịcạ Dr Moliner 50. 46100 Burjassot. Valencia Spain Received 29 January 1990 accepted 13 June 1990 Summary - The distribution of p homologous sequences among different strains of D subobscura is described. Southern analysis of genomic DNAs from the strains restricted with different enzymes showed rather homogeneous hybridization patterns p homologous sequences are ubiquitous in D subobscura although they are present in a very low copy number. They are strongly divergent from that of D melanogaster and are probably not functional. These results are consistent with the idea that p elements are very old components of the D subobscura genome. D subobscura molecular evolution p transposable element Résumé - Sequences homologues à 1 élément transposable p chez Drosophila subobscura. La distribution des séquences homologues à Vélément transposable p a été étudiée chez p subobscura. L analyse de I ADN génomique de diffdrentes souches réalisée par la technique de Southern-blot a montré I existence de profils de bandes très homogènes. Ges résúltats suggerent une présencẹ généralisée mats en faible nombre de copies de ces sequences chez D subobscura. Ges sequences sont probablement non-fonctionnelles faible-ment homologues à 1 élément p troũvé chez D melanogaster et très anciennes dans le genome de D subobscura. D subobscura I element transposable p I evolution moléculaire INTRODUCTION Transposable elements are widely distributed among the genomes of living organisms. The role of mobile elements as a cause of spontaneous mutagenesis is well established. In spite of their evolutionary significance as a source of genetic variability the screening and identification of the different element .

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