Chromosome fusions shaped karyotype evolution and evolutionary relationships in the model family Brassicaceae

文献类型： 外文期刊

第一作者： Jiang, Xinyao

作者： Jiang, Xinyao;Hu, Quanjun;Mei, Dong;Li, Xiaonan;Xiang, Ling;Liu, Jianquan;Sun, Pengchuan;Jiang, Xinyao;Hu, Quanjun;Mei, Dong;Li, Xiaonan;Xiang, Ling;Liu, Jianquan;Sun, Pengchuan;Al-Shehbaz, Ihsan A.;Song, Xiaoming;Liu, Jianquan;Lysak, Martin A.;Lysak, Martin A.;Sun, Pengchuan

作者机构：

期刊名称：NATURE COMMUNICATIONS （ 影响因子：15.7； 五年影响因子：17.2 ）

ISSN：

年卷期： 2025 年 16 卷 1 期

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收录情况： SCI

摘要： The ancestral crucifer karyotype and 22 conserved genomic blocks (CGBs) facilitate phylogenomic analyses in the Brassicaceae. Chromosomal rearrangements reshuffled CGBs of ancestral chromosomes during karyotype evolution. Here, we identify eight protochromosomes representing the common ancestral karyotype (ACBK) of the two Brassicoideae supertribes: Camelinodae (Lineage I) and Brassicodae (Lineage II). The characterization of multiple cascading fusion events allows us to infer evolutionary relationships based on these events. In the Camelinodae, the ACBK first evolved into the AKI genome, which remained conserved in the Cardamineae, whereas it was altered to tAKI by a reciprocal translocation that preceded the diversification of most Camelinodae tribes. The identified fusion breakpoints largely overlap with CGB boundaries, suggesting that CGBs are mainly disrupted by chromosome fusions. Our results demonstrate the stable inheritance of chromosome fusions and their importance for reconstructing evolutionary relationships. The chromosomal breakpoint approach provides a basis for ancestral state reconstruction based on chromosome-level genome assemblies.

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