Reference genome provide insights into sex determination of silver aworana (Osteoglossum bicirrhosum)

文献类型： 外文期刊

第一作者： Liu, Yi

作者： Liu, Yi;Yang, Yexin;Wang, Yuanyuan;Liu, Chao;Ouyang, Guochang;Xu, Meng;Mu, Xidong;Bian, Chao;Shi, Qiong;Ma, Ka Yan;Ouyang, Guochang;Sun, Jinhui;Shao, Changwei;Chen, Jiehu;Yang, Yexin

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关键词： Silver arowana; Whole-genome sequencing and assembly; Chromosome interaction; Transcriptome; Female-specific region; foxl2

期刊名称：BMC BIOLOGY （ 影响因子：4.5； 五年影响因子：5.4 ）

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年卷期： 2025 年 23 卷 1 期

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收录情况： SCI

摘要： Background Silver arowana (Osteoglossum bicirrhosum) is a basal fish species with sexual monomorphism, while its sex determination mechanism has been poorly understood, posing a significant challenge to its captive breeding efforts.ResultsWe constructed two high-quality chromosome-level genome assemblies for both female and male silver arowana, with scaffold N50 values over 10 Mb. Combining re-sequencing data of 109 individuals, we identified a female-specific region, which was localized in a non-coding region, i.e., around 26-kb upstream of foxl2 gene (encoding forkhead box L2). Its strong interaction with the neighboring foxl2 on the same chromosome suggests foxl2 as a candidate sex-related gene in silver arowana. We subsequently propose a complex gene network in the sex determination process of silver arowana, with foxl2 acting as the central contributor. Transcriptome sequencing of gonads support our hypothesis that the regulation of foxl2 can be influenced by the spatial proximity of the female-specific fragment, thereby promoting ovarian function or inhibiting testicular function to stimulate gonadal differentiation. Furthermore, we found the sex chromosomes to be homomorphic with a potentially recent origin, as a linkage disequilibrium analysis proved minor recombination suppression.ConclusionsThese results taken together serve as a crucial foundation for conducting extensive investigations on the evolution and differentiation of sex-determining mechanisms, as well as the emergence and development of sex chromosomes in various fishes.

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