tailieunhanh - Báo cáo sinh học: " Developmental temperature and somatic excision rate of mariner transposable element in three natural populations of Drosophila simulans"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Developmental temperature and somatic excision rate of mariner transposable element in three natural populations of Drosophila simulans | Genet Sei Evol 1993 25 121-132 Elsevier INRA 121 Original article Developmental temperature and somatic excision rate of mariner transposable element in three natural populations of Drosophila simulans F Chakrani p Capy JR David Centre National de la Recherche Scientifique Laboratoire de Biologie et Génétique Evolutives 91198 Gif-sur-Yvette Cedex France Received 21 September 1992 accepted 12 November 1992 Summary - The temperature effect on the somatic excision rate of an inactive copy peach of the mariner transposable element inserted in the white gene and responsible of the mutation wpch was investigated in isofemale lines from 3 natural populations of D simulans. The somatic excision rate of the peach element was measured by the proportion of mosaic males in the offspring of a test-cross between a wild type male originating from natural populations and white peach females of a reference strain GB1 . A significant effect of the breeding temperature was detected in 2 out of the 3 populations investigated ie Loua Congo and Bordeaux France . In these 2 populations the proportion of mosaic males increased with temperature. In the third population Agadir Morocco the proportion of mosaic males was always high whatever the temperature. A slight correlation between the excision rate and the number of mariner copies was observed. Finally this temperature effect may be related to a 14-bp sequence localized in the 5 inverted repeat of the element showing 50-57 of homology with sequences of heat shock protein promoters. Drosophila simulans I transposable element I mariner element I temperature Resume Temperature de développement et taux d excision de 1 élément mariner dans trois populations naturelies de Drosophila simulans. L effet de la temperature sur le taux d excision somatique d une copie inactive peach de 1 élément mariner insérée dans le gene white et responsable de la mutation white peach wpch a été analyse dans des lignées isofemelles de 3 populations naturelies de

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