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Variability, Recombination, and Mosaic Evolution of the Barley BARE-1 Retrotransposon

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Abstract

BARE-1 is a highly abundant, copia-like, LTR (long terminal repeat) retrotransposon in the genus Hordeum. The LTRs provide the promoter, terminator, and polyadenylation signals necessary for the replicational life cycle of retrotransposons. We have examined the variability and evolution of BARE-1-like elements, focusing on the LTRs. Three groups were found, corresponding to each of the Hordeum genome types analyzed, which predate the divergence of these types. The most variable LTR regions are tandem repeats near the 3′ end and the promoter. In barley (H. vulgare L.), two main classes of LTR promoters were defined, corresponding to BARE-1 and to a new class we call BARE-2. These can be considered as families within the group I BARE elements. Although less abundant in cultivated barley than is BARE-1, BARE-2 is transcriptionally active in leaves and calli. A sequenced BARE-2 has more than 99% similar LTRs and perfect terminal direct repeats (TDRs), indicating it is a recent insertion, but the coding region, especially gag, is disrupted by frameshifts and stop codons. BARE-2 appears to be a chimeric element resulting from retrotransposon recombination by strand switching during replication, with LTRs and 5′UTR more similar to BARE-1 and the rest more similar to Wis-2. We provide evidence as well for another form of recombination, where LTR-LTR recombination has generated tandem multimeric BARE-1 elements in which internal coding domains are interspersed with shared LTRs. The data indicate that recombination contributes to the complexity and plasticity of retroelement evolution in plant genomes.

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Acknowledgments

This work was supported by projects 44404 and 47581 from the Academy of Finland. Anne-Mari Narvanto is thanked for her always excellent technical assistance. David Kudrna and Andris Kleinhofs (Washington State University) are thanked for their gift of the barley BAC analyzed here.

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  1. Carlos M. Vicient

    Present address: Laboratori CSIC-IRTA de Genetica Molecular Vegetal, Jordi Girona 18-26, Barcelona, 08034, Spain

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  1. MTT/BI Plant Genomics Laboratory, Institute of Biotechnology, University of Helsinki, Helsinki, FIN-00014, Finland

    Carlos M. Vicient, Ruslan Kalendar & Alan H. Schulman

  2. Plant Breeding Biotechnology, MTT Agrifood Research Finland, Jokioinen, Finland

    Alan H. Schulman

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Vicient, C.M., Kalendar, R. & Schulman, A.H. Variability, Recombination, and Mosaic Evolution of the Barley BARE-1 Retrotransposon. J Mol Evol 61, 275–291 (2005). https://doi.org/10.1007/s00239-004-0168-7

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