Reprogramming of Retrotransposon Activity during Speciation of the Genus Citrus
| Autor: | Victoria Ibanez, Carles Borredá, Estela Pérez-Román, Javier Terol, Manuel Talon |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Transposable element Citrus Retroelements Genetic Speciation Lineage (evolution) LTR retrotransposon Retrotransposon Biology 010603 evolutionary biology 01 natural sciences Genome Evolution Molecular 03 medical and health sciences Species Specificity insertion time Genetic algorithm Genetics Clade Phylogeny Ecology Evolution Behavior and Systematics 030304 developmental biology 0303 health sciences Models Genetic genomic evolution Terminal Repeat Sequences food and beverages structural variations speciation Evolutionary biology Mobile genetic elements Adaptation Genome Plant Research Article |
| Zdroj: | electronico ReDivia. Repositorio Digital del Instituto Valenciano de Investigaciones Agrarias instname Genome Biology and Evolution |
| Popis: | Speciation of the genus Citrus from a common ancestor has recently been established to begin approximately 8 Mya during the late Miocene, a period of major climatic alterations. Here, we report the changes in activity of Citrus LTR retrotransposons during the process of diversification that gave rise to the current Citrus species. To reach this goal, we analyzed four pure species that diverged early during Citrus speciation, three recent admixtures derived from those species and an outgroup of the Citrus clade. More than thirty thousand retrotransposons were grouped in 10 linages. Estimations of LTR insertion times revealed that retrotransposon activity followed a species-specific pattern of change that could be ascribed to one of three different models. In some genomes, the expected pattern of gradual transposon accumulation was suddenly arrested during the radiation of the ancestor that gave birth to the current Citrus species. The individualized analyses of retrotransposon lineages showed that in each and every species studied, not all lineages follow the general pattern of the species itself. For instance, in most of the genomes, the retrotransposon activity of elements from the SIRE lineage reached its highest level just before Citrus speciation while for Retrofit elements it has been steadily growing. Based on these observations we propose that Citrus retrotransposons may respond to stressful conditions driving speciation as a part of the genetic response involved in adaptation. This proposal implies that the evolving conditions of each species interacts with the internal regulatory mechanisms of the genome controlling the proliferation of mobile elements. |
| Databáze: | OpenAIRE |
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