An updated explanation of ancestral karyotype changes and reconstruction of evolutionary trajectories to form Camelina sativa chromosomes.
BMC Genomics
; 21(1): 705, 2020 Oct 12.
Article
em En
| MEDLINE
| ID: mdl-33045990
ABSTRACT
BACKGROUND:
Belonging to lineage I of Brassicaceae, Camelina sativa is formed by two hybridizations of three species (three sub-genomes). The three sub-genomes were diverged from a common ancestor, likely derived from lineage I (Ancestral Crucifer karyotype, ACK). The karyotype evolutionary trajectories of the C. sativa chromosomes are currently unknown. Here, we managed to adopt a telomere-centric theory proposed previously to explain the karyotype evolution in C. sativa.RESULTS:
By characterizing the homology between A. lyrata and C. sativa chromosomes, we inferred ancestral diploid karyotype of C. sativa (ADK), including 7 ancestral chromosomes, and reconstructed the evolutionary trajectories leading to the formation of extant C. sativa genome. The process involved 2 chromosome fusions. We found that sub-genomes Cs-G1 and Cs-G2 may share a closer common ancestor than Cs-G3. Together with other lines of evidence from Arabidopsis, we propose that the Brassicaceae plants, even the eudicots, follow a chromosome fusion mechanism favoring end-end joining of different chromosomes, rather than a mechanism favoring the formation circular chromosomes and nested chromosome fusion preferred by the monocots.CONCLUSIONS:
The present work will contribute to understanding the formation of C. sativa chromosomes, providing insight into Brassicaceae karyotype evolution.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Evolução Molecular
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Brassicaceae
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Cromossomos de Plantas
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Cariótipo
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
China