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Widespread and transgenerational retrotransposon activation in inter- and intra-species recombinant inbred populations of Lotus japonicus

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  • Eigo Fukai, Niigata University, National Institute of Genetics Mishima, Kazusa DNA Research Institute
  • ,
  • Manabu Yoshikawa, National Institute of Agrobiological Sciences
  • ,
  • Niraj Shah
  • ,
  • Niels Sandal
  • Akio Miyao, Kiel University
  • ,
  • Seijiro Ono, Division of Cancer Epidemiology and Genetics, Clinical Genetics Branch, National Cancer Institute, National Institutes of Health.
  • ,
  • Hideki Hirakawa, Kazusa DNA Research Institute
  • ,
  • Turgut Yigit Akyol
  • Yosuke Umehara, National Institute of Agrobiological Sciences
  • ,
  • Ken-Ichi Nonomura, Division of Cancer Epidemiology and Genetics, Clinical Genetics Branch, National Cancer Institute, National Institutes of Health.
  • ,
  • Jens Stougaard
  • Hirohiko Hirochika, National Institute of Agrobiological Sciences
  • ,
  • Makoto Hayashi, National Institute of Agrobiological Sciences
  • ,
  • Shusei Sato, Kazusa DNA Research Institute
  • ,
  • Stig Uggerhøj Andersen
  • Keiichi Okazaki, Niigata University

Transposable elements (TEs) constitute a large proportion of genomes of multicellular eukaryotes including flowering plants. TEs are normally maintained in a silenced state and their transpositions rarely occur. Hybridization between distant species has been regarded as a "shock" that stimulates genome re-organization, including TE mobilization. However, whether crosses between genetically close parents that result in viable and fertile offspring can induce TE transpositions has remained obscure. Here, we investigated the activation of long terminal repeat (LTR) retrotransposons in three Lotus japonicus recombinant inbred line (RIL) populations. We found that at least six LTR retrotransposon families were activated and transposed in 78% of the investigated RILs. LORE1a, one of the transposed LTR retrotransposons, showed transgenerational epigenetic activation, indicating the long-term effects of epigenetic instability induced by hybridization. Our study highlights TE activation as unexpectedly common events in plant reproduction.

OriginalsprogEngelsk
TidsskriftThe Plant Journal
Vol/bind111
Nummer5
Sider (fra-til)1397-1410
Antal sider14
ISSN0960-7412
DOI
StatusUdgivet - sep. 2022

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