An updated explanation of ancestral karyotype changes and reconstruction of evolutionary trajectories to form Camelina sativa chromosomes

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...

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Bibliographic Details
Published in:BMC genomics 2020-10, Vol.21 (1), p.705-705, Article 705
Main Authors: Zhang, Zhikang, Meng, Fanbo, Sun, Pengchuan, Yuan, Jiaqing, Gong, Ke, Liu, Chao, Wang, Weijie, Wang, Xiyin
Format: Article
Language:English
Subjects:
Arabidopsis - genetics
Brassicaceae
Brassicaceae - classification
Brassicaceae - genetics
C. sativa
Camelina sativa
Chromosome
Chromosomes
Chromosomes, Plant - genetics
Correspondence
Deoxyribonucleic acid
Diploids
Diploidy
DNA
Evolution
Evolution, Molecular
Evolutionary genetics
Genes
Genetic aspects
Genetic research
Genomes
Genomics
Homology
Identification and classification
Karyotype
Karyotypes
Karyotyping
Phylogenetics
Polyploid
Telomerase
Telomeres
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Summary: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. 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. The present work will contribute to understanding the formation of C. sativa chromosomes, providing insight into Brassicaceae karyotype evolution.
ISSN:1471-2164
1471-2164
DOI:10.1186/s12864-020-07081-0