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  Migration of repetitive DNAs during evolution of the permanent translocation heterozygosity in the oyster plant (Tradescantia section Rhoeo)

Golczyk, H., Hřibová, E., Doležel, J., Cuadrado, Á., Garbsch, F., Greiner, S., et al. (2022). Migration of repetitive DNAs during evolution of the permanent translocation heterozygosity in the oyster plant (Tradescantia section Rhoeo). Chromosoma: Biology of the Nucleus, 131, 163-173. doi:10.1007/s00412-022-00776-1.

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 Creators:
Golczyk, Hieronim1, Author
Hřibová, Eva1, Author
Doležel, Jaroslav1, Author
Cuadrado, Ángeles1, Author
Garbsch, Frauke1, Author
Greiner, S.2, Author           
Janeczko, Monika1, Author
Szklarczyk, Marek1, Author
Masłyk, Maciej1, Author
Kubiński, Konrad1, Author
Affiliations:
1external, ou_persistent22              
2Cytoplasmic and Evolutionary Genetics, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753324              

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 Abstract: Due to translocation heterozygosity for all chromosomes in the cell complement, the oyster plant (Tradescantia spathacea) forms a complete meiotic ring. It also shows Rabl-arrangement at interphase, featured by polar centromere clustering. We demonstrate that the pericentromeric regions of the oyster plant are homogenized in concert by three subtelomeric sequences: 45S rDNA, (TTTAGGG)n motif, and TSrepI repeat. The Rabl-based clustering of pericentromeric regions may have been an excellent device to combine the subtelomere-pericentromere sequence migration (via inversions) with the pericentromere-pericentromere DNA movement (via whole arm translocations) that altogether led to the concerted homogenization of all the pericentromeric domains by the subtelomeric sequences. We also show that the repetitive sequence landscape of interstitial chromosome regions contains many loci consisting of Arabidopsis-type telomeric sequence or of TSrepI repeat, and it is extensively heterozygous. However, the sequence arrangement on some chromosomal arms suggest segmental inversions that are fully or partially homozygous, a fact that could be explained if the inversions started to create linkages already in a bivalent-forming ancestor. Remarkably, the subterminal TSrepI loci reside exclusively on the longer arms that could be due to sharing sequences between similarly-sized chromosomal arms in the interphase nucleus. Altogether, our study spotlights the supergene system of the oyster plant as an excellent model to link complex chromosome rearrangements, evolution of repetitive sequences, and nuclear architecture.

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Language(s): eng - English
 Dates: 2022-07-272022-09
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1007/s00412-022-00776-1
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Title: Chromosoma : Biology of the Nucleus
  Other : Chromosoma
Source Genre: Journal
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Publ. Info: Wien : Springer-Verlag
Pages: - Volume / Issue: 131 Sequence Number: - Start / End Page: 163 - 173 Identifier: ISSN: 0009-5915
CoNE: https://pure.mpg.de/cone/journals/resource/991042749609288