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Мобильные элементы и эволюция генома М.Б. Евгеньев, Е.С. Зеленцова, Н.Г. Шостак, Е.Н. Мяснянкина, О.Г. Зацепина, Д.Г. Гарбуз, Шилова В. Ю. и М.И. Соколова Институт Молекулярной Биологии им. В.А. Энгельгардта, РАН
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Genome invasion or de novo formation Evolution Multiplication Domestication Loss Maintenance Host defense Genetic burden Deleterious effect Regulation Variability Death Distribution in sequenced genomes Dynamics of invasion
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TE-products poisoning Gene- disruption Ectopic recombination Low recombination rate region Low expression level region Low gene density region Heterochromatin
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Gross morphology: ovaries Bilateral and unilateral sterile ovaries in dysgenic D.virilis
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Ovariole morphology: agametic ( in dysgenic ovaries)
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Drosophila virilis adult dysgenic testis
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Forming the primordial gonads in Drosophila virilis dysgenic 9 strain - wild type - control
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Reduction in pole cells in dysgenic embryos, cntd
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Drosophila virilis: whole mount hybridization with Penelope DNA probe 160x99x160 160 9
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Penelope transcript GT 5' cDNA fragment intron AG AT TG 1 kb. Penelope, clone p6 XhoIEcoRI BamHI XhoI Schematic representation of Penelope clone isolated from the genome of D.virilis. 5’fragment of cDNA with intron 75 b.p. length is shown above
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371 Intron 1 250 302 369 416 487 544 570 611 680 850 S ov- th- R ov- th- 371 P ov- th+ O ov- th+ N ov- th+ F ov- th+ B ov+ th± C ov+ th± D ov± th+ A ov+ th± 416 491 Promoter Regulatory elements G ov- th- ∆ (416 – 491) - transcription start ORF Penelope
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Neighbor-joining tree based on the multiple alignment of 7 conserved motifs of reverse transcriptase domain Penelope – retrotransposon from D.virilis; Neptune – retrotransposon from Fugu rubripes; Poseidon - retrotransposon from Tetraodon nigroviridis; Xena - retrotransposon from Takifugu rubripes
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Fig. Multiple alignment of the C-terminal region of Penelope with a selection of GIY-YIG domain endonucleases. * shows the positions of conservative AA residues selected for mutagenesis of Penelone endonuclese catalytic domain. Substituted AA residues are shown above (Y736H, Y750H, R761A, H782G, D793A, E801G).
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kDa 220 97 67 46 30 20 1 2 3 4 5 Purification of Penelope protein from Spodoptera frugiperda cells infected by baculovirus containing Penelope ORF Penelope protein was purified by multiple step chromatography using: 2) - phosphocellulose P11 (Whatman); 3) – heparin-sepharose (Pharmacia); 4) - MonoS (FPLC, Pharmacia) and 5) - concentrated using 50 kDa Centricon (Millipore)
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Изучение влияния мутаций по rasiRNA-зависимому пути на количество транскриптов мобильного элемента Рenelope с использованием метода RT-PCR Pen +/- -/- spn-e уровень экспрессии Количество транскриптов мобильного элемента Penelope на фоне мутации spn-e Pen rp49 Pen +/- +/+ -/- armi Pen rp49 уровень экспрессии Количество транскриптов мобильного элемента Penelope на фоне мутации armitage
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Table 1. Phylum Class Species PLEs 10 18 about 100 Penelope, Athena, (e.g. Protista, Rotifera, (e.g. Crustacea, Amphibia, Cercyon, Bridge, Arthropoda, Chordata) Echinoidea, Insecta) Xena
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pUC-8 1kb Penelope p6 KXE white H S S E E X 3'P H S Penelope ORF KXEE 3'P Pr K X 5'P white H S S S Pen ORF X S K E 3'P Pr X 5'P white H S S A B C H S 5'P Schematic representation of the structure of Penelope copies integrated into D. melanogaster genome DNA construction containing A) full length Penelope clone p6; B) full length Penelope ORF under control heat shock promoter of D.melanogaster; C) Penelope ORF with a deletion of 5' region under control heat shock promoter of D.melanogaster. Arrows with 3'P and 5'P mean 3'P and 5'P inverted repeats of P element, respectively. Arrow with Pr displays a Hsp70Bb heat shock promoter of D.melanogaster. The symbols indicated above correspond the restriction sites (X, H, E, S and K represent XhoI, HindIII, EcoRI, SalI and KpnI, respectively)
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kb. 10.0 8.0 6.0 5.0 4.0 3.0 2.5 2.0 1.5 1.0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Southern blot hybridization of transformed D.melanogaster strains with Penelope probe Lanes 1-3 initial strain Df(I)w, yw 67c23(2) ; lanes 4-6; 7-9 strains transformed with Penelope ORF under control of heat shock promoter; 10-12; 13-15; strains transformed with full length Penelope copy (p6). Lanes 1- 4; 7; 10; 13 genomic DNA digested by XhoI; lanes 2; 5; 8; 11; 14 genomic DNA digested by Hind III; lanes 3; 6; 9; 12; 15 genomic DNA digested by Sal I pUC-8 Penelope p6 X white H S S X 3'P H S 5'P 8,5 kb
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А B Results of in situ hybridization of polytene chromosomes of flies D.melanogaster transformed by Penelope-containing clone (p6) А - in situ hybridization with "mini-white"; B - hybridisation with Penelope. Hybridization sites are shown by arrows
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Results of in situ hybridization of polytene chromosomes of flies D.melanogaster transformed by Penelope-containing clone (p6)
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Drosophila melanogaster transformation with the Penelope transposable element Sterile ovaries Agametic ovarioles
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The design of localization of EPgy2 insertions into hsp70Aa and hsp70Ab genes in strains with US-4 and US-2. Number of primers is indicated. hsp70Aa hsp70Ab CG3281 aur CG12213 EPgy2 3 1 2 4 54 4 2 1 3 55 6 7 5 5 CG18347 EPgy2 53 5 5 6 7
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P-element construct hsp70Aahsp70Ab
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Southern-hybridization of genome DNA from heterozygous transformants with 5’ (up) and 3’ (down) fragments of D. melanogaster hsp70 (HindIII-BamHI) 4.3 kb Bbb 3.3 kb Bb+Bc 2.5 kb Aa 2.1 kb Ba 1.8 kb Ab 4.4 Bc 4.3 Ab, Bb 2.0 Aa, Ba
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hsp70Aa hsp70Ab Strains from US-2 57% 43% HHHT +1 -229(1) 200(1) -135(4) -97(3) -160(1) -96(3) -40(1) H g gg gg
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GGCGCACT target duplication HHHT +1 -240(1) -174(1) -135(4) -97(12) -42(2) -28(1) -144(1) -96(5) -40(1) hsp70Aa hsp70Ab 87% 13% CGGCGCAC target duplication Strains from US-4 -137(1) H g gg gg
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Сравнение экспериментальной и естественной транспозиции
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ВЫВОДЫ МОБИЛЬНЫЕ ЭЛЕМЕНТЫ СОСТАВЛЯЮТ ЗНАЧИТЕЛЬНУЮ ПРОПОРЦИЮ ГЕНОМА ВСЕХ ИЗУЧЕННЫХ ОРГАНИЗМОВ. ПРИ ПРОВЕДЕНИИ ОПРЕДЕЛЕННЫХ СКРЕЩИВАНИЙ ПРОИСХОДИТ АМПЛИФИКАЦИЯ И МАССОВЫЕ ТРАНСПОЗИЦИИ ОПРЕДЕЛЁННЫХ СЕМЕЙСТВ МОБИЛЬНЫХ ЭЛЕМЕНТОВ («СИНДРОМ ГИБРИДНОГО ДИСГЕНЕЗА»). ВЫСОКИЙ УРОВЕНЬ ГЕНЕТИЧЕСКОГО ПОЛИМОРФИЗМА, ВОЗНИКАЮЩИЙ ПРИ СИНДРОМ ГИБРИДНОГО ДИСГЕНЕЗА, МОЖЕТ СЛУЖИТЬ МАТЕРИАЛОМ ДЛЯ ОТБОРА, ПРИВОДЯ К БЫСТРОМУ, «ВЗРЫВНОМУ» ВИДООБРАЗОВАНИЮ.
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