tailieunhanh - Báo cáo sinh học: "elements in South American populations of Drosophila simulans"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh Original cung cấp cho các bạn kiến thức về sinh học đề tài:elements in South American populations of Drosophila simulans. | Genet. Sei. Evol. 30 1998 171-180 Inra Elsevier Paris 171 Original article - Transposable elements in South American populations of Drosophila simulans Elgion Lucio da Silva Loreto a Arnaldo Zahab Vera Lucia da Silva Valentec a Departamento de Biologia Universidade Federal de Santa Maria Santa Maria RS Brazil b Departamento de Biotecnologia Universidade Federal do Rio Grande do Sul Porto Alegre RS Brazil c Departamento de Genética Caixa Postal 15053 Universidade Federal do Rio Grande do Sul CEP 91501-970 Porto Alegre RS Brazil Received 20 June 1997 accepted 27 January 1997 Abstract - This study investigated the occurrence of four transposable elements mariner gypsy hobo and 412 in South American populations of Drosophila simulans. The genomic hybridization patterns of 12 different populations were determined by Southern blot analyses. Even though a low number of mariner copies was observed each population presented a characteristic hybridization pattern suggesting that the element is active. The number of gypsy copies was also low but all populations bore a similar hybridization pattern. In this paper we describe the occurrence of an almost gypsy-iiee strain which had not yet been found for D. simulans nor D. melanogaster. In the case of hobo we did not detect the deleted hobo element in any of the South American populations while this element is present in all strains originating from other geographical sites that were analysed up to now suggesting that the hobo element may have very recently invaded the genome of South American D. simulans populations. The 412 element presented some population-specific band patterns indicating that this element may have some transposition activity in the different populations. Inra Elsevier Paris Drosophila simulans I transposable element mariner hobo gypsy 412 Resume Elements transposables dans des populations sud-américaines de Drosophila simulans. Cette étude recherche la presence de quatre elements transposables .