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Genome size variation at constant chromosome number is not correlated with repetitive DNA dynamism in Anacyclus (Asteraceae)

AuthorsVitales, Daniel ; Álvarez, Inés; Garcia, Sònia ; Hidalgo, Oriane ; Nieto Feliner, Gonzalo ; Pellicer, Jaume; Vallès, Joan; Garnatje, Teresa
Chromosome number
Comparative genomics
Genome size
Heliocauta atlantica
Homoploid hybridization
Repetitive DNA
Reticulate evolution, Transposable elements (TEs)
Issue Date13-Mar-2020
PublisherOxford University Press
CitationAnnals of Botany 125(4): 611-623 (2020)
Abstract[Background and Aims] Changes in the amount of repetitive DNA (dispersed and tandem repeats) are considered the main contributors to genome size variation across plant species in the absence of polyploidy. However, the study of repeatome dynamism in groups showing contrasting genomic features and complex evolutionary histories is needed to determine whether other processes underlying genome size variation may have been overlooked. The main aim here was to elucidate which mechanism best explains genome size evolution in Anacyclus (Asteraceae). [Methods] Using data from Illumina sequencing, we analysed the repetitive DNA in all species of Anacyclus, a genus with a reticulate evolutionary history, which displays significant genome size and karyotype diversity albeit presenting a stable chromosome number. [Key Results] By reconstructing ancestral genome size values, we inferred independent episodes of genome size expansions and contractions during the evolution of the genus. However, analysis of the repeatome revealed a similar DNA repeat composition across species, both qualitative and quantitative. Using comparative methods to study repeatome dynamics in the genus, we found no evidence for repeat activity causing genome size variation among species. [Conclusions] Our results, combined with previous cytogenetic data, suggest that genome size differences in Anacyclus are probably related to chromosome rearrangements involving losses or gains of chromosome fragments, possibly associated with homoploid hybridization. These could represent balanced rearrangements that do not disrupt gene dosage in merged genomes, for example via chromosome segment exchanges.
Publisher version (URL)http://dx.doi.org/10.1093/aob/mcz183
Identifiersdoi: 10.1093/aob/mcz183
issn: 0305-7364
e-issn: 1095-8290
Appears in Collections:(IBB) Artículos
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