Parental transposable element loads influence their dynamics in young <em>Nicotiana</em> hybrids and allotetraploids
2019
Mhiri, Corinne | Parisod, Christian | Daniel, Julien | Petit, Maud | Lim, K. Yoong | de Borne, François Dorlhac | Kovarik, Ales | Leitch, Andrew | Grandbastien, Marie-Angele | Institut Jean-Pierre Bourgin (IJPB) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech | Centre National de la Recherche Scientifique (CNRS) | Universität Bern = University of Bern = Université de Berne (UNIBE) | Microbiologie Environnement Digestif Santé (MEDIS) ; Institut National de la Recherche Agronomique (INRA)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020]) | School of biological and chemical sciences ; Queen Mary University of London (QMUL) | LeAF | Biology Centre of the Czech Academy of Sciences (BIOLOGY CENTRE CAS) ; Czech Academy of Sciences [Prague] (CAS) | Association pour la Recherche sur les Nicotianees (ARN) [BTH01453]; Agence Nationale de la Recherche [ANR-05-BDIV-015]; Campus France (PHC Barrande) [09150SH]; Campus France (PHC Alliance) [08782YM]; Czech Science Foundation GAR [501/12/G090]; Natural Environment Research Council; Agence Nationale de la Recherche through the Labex Saclay Plant Science-SPS project [ANR-10-LABX-0040-SPS] | ANR-17-EURE-0007,SPS-GSR,Ecole Universitaire de Recherche de Sciences des Plantes de Paris-Saclay(2017) | ANR-10-LABX-0040,SPS,Saclay Plant Sciences(2010)
International audience
اظهر المزيد [+] اقل [-]إنجليزي. The genomic shock hypothesis suggests that allopolyploidy is associated with genome changes driven by transposable elements, as a response to imbalances between parental insertion loads. To explore this hypothesis, we compared three allotetraploids, Nicotiana arentsii, N. rustica and N. tabacum, which arose over comparable time frames from hybridisation between increasingly divergent diploid species. We used sequence‐specific amplification polymorphism (SSAP) to compare the dynamics of six transposable elements in these allopolyploids, their diploid progenitors and in corresponding synthetic hybrids. We show that element‐specific dynamics in young Nicotiana allopolyploids reflect their dynamics in diploid progenitors. Transposable element mobilisation is not concomitant with immediate genome merger, but occurs within the first generations of allopolyploid formation. In natural allopolyploids, such mobilisations correlate with imbalances in the repeat profile of the parental species, which increases with their genetic divergence. Other restructuring leading to locus loss is immediate, nonrandom and targeted at specific subgenomes, independently of cross orientation. The correlation between transposable element mobilisation in allopolyploids and quantitative imbalances in parental transposable element loads supports the genome shock hypothesis proposed by McClintock.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Institut national de la recherche agronomique