Lost and Found: Return of the Inverted Repeat in the Legume Clade Defined by Its Absence
| Autor: | Tracey A. Ruhlman, Robert K. Jansen, In-Su Choi |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Inverted repeat Genome Plastid homologous recombination Biology 010603 evolutionary biology 01 natural sciences Genome 03 medical and health sciences accD Medicago Genetics Gene conversion Plastid plastome evolution Clade Ecology Evolution Behavior and Systematics 030304 developmental biology 0303 health sciences Medicago minima gene conversion Inverted Repeat Sequences fungi food and beverages biology.organism_classification Biological Evolution Chloroplast DNA Evolutionary biology alfalfa Research Article |
| Zdroj: | Genome Biology and Evolution |
| ISSN: | 1759-6653 |
| DOI: | 10.1093/gbe/evz076 |
| Popis: | The plant genome comprises a coevolving, integrated genetic system housed in three subcellular compartments: the nucleus, mitochondrion, and the plastid. The typical land plant plastid genome (plastome) comprises the sum of repeating units of 130–160 kb in length. The plastome inverted repeat (IR) divides each plastome monomer into large and small single copy regions, an architecture highly conserved across land plants. There have been varying degrees of expansion or contraction of the IR, and in a few distinct lineages, including the IR-lacking clade of papilionoid legumes, one copy of the IR has been lost. Completion of plastome sequencing and assembly for 19 Medicago species and Trigonella foenum-graceum and comparative analysis with other IR-lacking clade taxa revealed modest divergence with regard to structural organization overall. However, one clade contained unique variation suggesting an ancestor had experienced repeat-mediated changes in plastome structure. In Medicago minima, a novel IR of ∼9 kb was confirmed and the role of repeat-mediated, recombination-dependent replication in IR reemergence is discussed. |
| Databáze: | OpenAIRE |
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