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Genetic diversity study of self-fertilized and gynogenetic Japanese flounder ( Paralichthys olivaceus) in whole genomic level

文献类型： 外文期刊

作者： San, Lize 1 ; Wang, Guixing 1 ; Zhang, Xiaoyan 1 ; Zhang, Yitong 1 ; Cao, Wei 1 ; He, Zhongwei 1 ; Liu, Yufeng 1 ; Yang, Yucong 1 ; Liu, Mingyang 1 ; Ren, Yuqin 2 ; Wang, Yufen 1 ; Hou, Jilun 1 ;

作者机构： 1.Chinese Acad Fishery Sci, State Key Lab Mariculture Biobreeding & Sustainabl, Beidaihe Cent Expt Stn, Qinhuangdao 066100, Peoples R China

2.Chinese Acad Fishery Sci, Hebei Key Lab Bohai Sea Fish Germplasm Resources C, Beidaihe Cent Expt Stn, Qinhuangdao 066100, Peoples R China

3.Chinese Acad Fishery Sci, Bohai Sea Fishery Res Ctr, Qinhuangdao 066100, Peoples R China

关键词： Self-fertilization; Meiotic gynogenesis; Mitotic gynogenesis; Single nucleotide polymorphism; Genetic diversity

期刊名称：AQUACULTURE （ 影响因子：3.9； 五年影响因子：4.4 ）

ISSN： 0044-8486

年卷期： 2025 年 598 卷

页码：

收录情况： SCI

摘要： Self-fertilization and the techniques of gynogenesis constitute important methods for establishing inbred lines in fish. This study assessed the effects of chromosome manipulation techniques, including conventional fertilization, self-fertilization, meiotic gynogenesis, and mitotic gynogenesis, on hatch success, deformity rates, and genetic diversity in Japanese flounder ( Paralichthys olivaceus). Understanding the impact of these methods on the genetic composition of offspring is crucial. The study demonstrated that mitotically gynogenetic offspring exhibited significantly reduced hatch rates and higher homozygosity, which resulted from the inhibition of the first mitotic division, leading to an accumulation of homozygous segments. In contrast, offspring from conventional fertilization displayed the richest genetic diversity, benefiting from genetic recombination during meiosis. Genomic analysis revealed distinct patterns of Runs of Homozygosity (ROH), with mitotically gynogenetic offspring exhibiting the highest number and length of ROH, reflecting a high degree of genomic homozygosity. Furthermore, the study identified candidate genes implicated in key biological pathways such as cell growth, differentiation, apoptosis, and DNA repair, emphasizing their importance across different breeding methods. The findings highlight the importance of genetic diversity for offspring viability and underscore the value of genomic analysis in refining aquaculture breeding strategies. The selection of appropriate methods to construct inbred lines during fish breeding is essential for influencing hatch rates and deformity rates in offspring.

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