Evolution, Inheritance, and Strata Formation of the W Chromosome in Duck (Anas platyrhynchos)

文献类型： 外文期刊

第一作者： Gu, Hongchang

作者： Gu, Hongchang;Wen, Junhui;Zhao, Xiurong;Zhang, Xinye;Ren, Xufang;Cheng, Huan;Qu, Lujiang;Gu, Hongchang

作者机构：

关键词： sex chromosome; sex-specific selection; maternal inheritance; genome assembly; recombination suppression; sequence evolution

期刊名称：GENOME BIOLOGY AND EVOLUTION （ 影响因子：3.3； 五年影响因子：3.5 ）

ISSN： 1759-6653

年卷期： 2023 年 15 卷 11 期

页码：

收录情况： SCI

摘要： The nonrecombining female-limited W chromosome is predicted to experience unique evolutionary processes. Difficulties in assembling W chromosome sequences have hindered the identification of duck W-linked sequences and their evolutionary footprint. To address this, we conducted three initial contig-level genome assemblies and developed a rigorous pipeline by which to successfully expand the W-linked data set, including 11 known genes and 24 newly identified genes. Our results indicate that the W chromosome expression may not be subject to female-specific selection; a significant convergent pattern of upregulation associated with increased female-specific selection was not detected. The genetic stability of the W chromosome is also reflected in the strong evolutionary correlation between it and the mitochondria; the complete consistency of the cladogram topology constructed from their gene sequences proves the shared maternal coevolution. By detecting the evolutionary trajectories of W-linked sequences, we have found that recombination suppression started in four distinct strata, of which three were conserved across Neognathae. Taken together, our results have revealed a unique evolutionary pattern and an independent stratum evolutionary pattern for sex chromosomes.

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