Parental transposable element loads influence their dynamics in young Nicotiana hybrids and allotetraploids

Mhiri, Corinne; Parisod, Christian; Daniel, Julien; Petit, Maud; Lim, K. Yoong; Dorlhac de Borne, François; Kovarik, Ales; Leitch, Andrew R.; Grandbastien, Marie-Angèle (2019). Parental transposable element loads influence their dynamics in young Nicotiana hybrids and allotetraploids. New Phytologist, 221(3), pp. 1619-1633. Wiley-Blackwell 10.1111/nph.15484

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Ecological Genomics
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Parisod, Christian Gérard

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0028-646X

Publisher:

Wiley-Blackwell

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

06 Nov 2018 12:45

Last Modified:

04 Nov 2019 19:29

Publisher DOI:

10.1111/nph.15484

Uncontrolled Keywords:

allopolyploidy; evolution; genome shock; Nicotiana arentsii; Nicotiana rustica; Nicotiana tabacum; sequence‐specific amplification; polymorphism (SSAP); transposable element

BORIS DOI:

10.7892/boris.120942

URI:

https://boris.unibe.ch/id/eprint/120942

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