Repeated turnovers keep sex chromosomes young in willows.

IF 12.3 1区生物学 Q1 Agricultural and Biological Sciences

Genome Biology Pub Date : 2022-09-23 DOI:10.1186/s13059-022-02769-w

Deyan Wang, Yiling Li, Mengmeng Li, Wenlu Yang, Xinzhi Ma, Lei Zhang, Yubo Wang, Yanlin Feng, Yuanyuan Zhang, Ran Zhou, Brian J Sanderson, Ken Keefover-Ring, Tongming Yin, Lawrence B Smart, Stephen P DiFazio, Jianquan Liu, Matthew Olson, Tao Ma

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引用次数: 6

Abstract

Background: Salicaceae species have diverse sex determination systems and frequent sex chromosome turnovers. However, compared with poplars, the diversity of sex determination in willows is poorly understood, and little is known about the evolutionary forces driving their turnover. Here, we characterized the sex determination in two Salix species, S. chaenomeloides and S. arbutifolia, which have an XY system on chromosome 7 and 15, respectively.

Results: Based on the assemblies of their sex determination regions, we found that the sex determination mechanism of willows may have underlying similarities with poplars, both involving intact and/or partial homologs of a type A cytokinin response regulator (RR) gene. Comparative analyses suggested that at least two sex turnover events have occurred in Salix, one preserving the ancestral pattern of male heterogamety, and the other changing heterogametic sex from XY to ZW, which could be partly explained by the "deleterious mutation load" and "sexually antagonistic selection" theoretical models. We hypothesize that these repeated turnovers keep sex chromosomes of willow species in a perpetually young state, leading to limited degeneration.

Conclusions: Our findings further improve the evolutionary trajectory of sex chromosomes in Salicaceae species, explore the evolutionary forces driving the repeated turnovers of their sex chromosomes, and provide a valuable reference for the study of sex chromosomes in other species.

Abstract Image

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在柳树中，反复的循环使性染色体保持年轻。

背景:水杨科物种具有多样化的性别决定系统和频繁的性染色体翻转。然而，与杨树相比，人们对柳树性别决定的多样性知之甚少，对推动其更替的进化力量知之甚少。本研究对分别在7号染色体和15号染色体上具有XY系统的两种柳属植物S. chaenomeloides和S. arbutifolia的性别决定进行了研究。结果:基于性别决定区域的组装，我们发现柳树的性别决定机制可能与杨树具有潜在的相似性，都涉及a型细胞分裂素反应调节因子(RR)基因的完整和/或部分同源。比较分析表明，柳属植物至少发生了两种性别转换事件，一种是保留了祖先的雄性异配子模式，另一种是将异配子性别从XY转变为ZW，这可以部分解释为“有害突变负荷”和“性拮抗选择”理论模型。我们假设这些重复的翻转使柳树物种的性染色体永远处于年轻状态，导致有限的退化。结论:本研究结果进一步完善了水杨科物种性染色体的进化轨迹，探索了水杨科物种性染色体重复翻转的进化动力，为其他物种性染色体的研究提供了有价值的参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Genome Biology BIOTECHNOLOGY & APPLIED MICROBIOLOGY-GENETICS & HEREDITY

CiteScore

25.50

自引率

3.30%

发文量

审稿时长

14 weeks

期刊介绍： Genome Biology is a leading research journal that focuses on the study of biology and biomedicine from a genomic and post-genomic standpoint. The journal consistently publishes outstanding research across various areas within these fields. With an impressive impact factor of 12.3 (2022), Genome Biology has earned its place as the 3rd highest-ranked research journal in the Genetics and Heredity category, according to Thomson Reuters. Additionally, it is ranked 2nd among research journals in the Biotechnology and Applied Microbiology category. It is important to note that Genome Biology is the top-ranking open access journal in this category. In summary, Genome Biology sets a high standard for scientific publications in the field, showcasing cutting-edge research and earning recognition among its peers.