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Genome-wide association study of feed conversion ratio in turbot (Scophthalmus maximus) based on genome resequencing

文献类型： 外文期刊

作者： Liu, Zhifeng 1 ; Chang, Haowen 1 ; Xu, Fei 1 ; Zhao, Haichi 1 ; Zhu, Liguang 1 ; Sun, Zhibin 1 ; Yang, Mingchao 1 ; Wang, Xinan 1 ; Ma, Aijun 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China

2.Natl Key Lab Mariculture Biobreeding & Sustainable, Qingdao 266071, Peoples R China

3.Shandong Key Lab Marine Fisheries Biotechnol & Gen, Qingdao 266071, Peoples R China

4.Qingdao Key Lab Marine Fish Breeding & Biotechnol, Qingdao 266071, Peoples R China

5.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Marine Biol & Biotechnol, Qingdao 266071, Peoples R China

6.Zhejiang Ocean Univ, Zhoushan 316022, Peoples R China

关键词： Turbot; Feed conversion ratio (FCR); Genome-wide association study (GWAS); Genome resequencing

期刊名称：AQUACULTURE REPORTS （ 影响因子：3.7； 五年影响因子：3.8 ）

ISSN： 2352-5134

年卷期： 2023 年 33 卷

页码：

收录情况： SCI

摘要： The feed conversion rate (FCR) is a crucial economic trait in aquaculture fish, as feed costs account for the vast majority of aquaculture costs. Given the importance of this trait, there have little efforts to unravel the genomic architecture of FCR and identify key genes or genomic regions useful as selection makers. This situation may stem from the inherent swimming behavior of fish, which presents challenges in obtaining individual FCRs. In this work, we developed a specialized small cage culture system. Through this system, the Feed Conversion Ratio (FCR) of 300 individuals was successfully determined, marking the first successful determination of individual FCRs for turbot. The results revealed a range of FCR values from 35.3% to 192.6%, with an average of 126.5% +/- 23.5%. On this basis, a genome-wide association study (GWAS) was conducted to identify single nucleotide polymorphisms (SNP) associated with FCR. A total of 2613,115 SNPs on 22 chromosomes were selected for GWAS analysis by Efficient Mixed-Model Association eXpedited (EMMAX) software. A linear mixed model was employed to test the association between each SNP and FCR, considering population structure and genetic relatedness among individuals. Two significant SNPs on Chr6 were identified to be correlated with FCR. According to their localization in genome, four candidate genes were identified on Chr6, including uncharacterized protein KIAA1755, Kinesin Family Member 21B (KIF21B), Discs large homolog-associated protein 4B (DLGAP4B), and Copine 5B (CPNE5B), all of which are closely located in the genome and exhibit significant functional similarities. Our results will facilitate the implementation of marker-assisted selection in breeding programs and serve as a foundation for future research in this area.

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