A high-density SNP-based genetic map and several economic traits-related loci in Pelteobagrus vachelli
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RESEARCH ARTICLE
Open Access
A high-density SNP-based genetic map and several economic traits-related loci in Pelteobagrus vachelli Guosong Zhang1,2†, Jie Li1†, Jiajia Zhang1, Xia Liang2, Tao Wang1,3 and Shaowu Yin1,3*
Abstract Background: A high-density genetic linkage map is essential for QTL fine mapping, comparative genome analysis, identification of candidate genes and marker-assisted selection in aquaculture species. Pelteobagrus vachelli is a very popular commercial species in Asia. However, some specific characters hindered achievement of the traditional selective breeding based on phenotypes, such as lack of large-scale genomic resource and short of markers tightly associated with growth, sex determination and hypoxia tolerance related traits. Results: By making use of 5059 ddRAD markers in P. vachelli, a high-resolution genetic linkage map was successfully constructed. The map’ length was 4047.01 cM by using an interval of 0.11 cm, which is an average marker standard. Comparative genome mapping revealed that a high proportion (83.2%) of markers with a one-to-one correspondence were observed between P. vachelli and P. fulvidraco. Based on the genetic map, 8 significant genome-wide QTLs for 4 weight, 1 body proportion, 2 sex determination, and 1 hypoxia tolerance related traits were detected on 4 LGs. Some SNPs from these significant genome-wide QTLs were observably associated with these phenotypic traits in other individuals by Kompetitive Allele Specific PCR. In addition, two candidate genes for weight, Sipa1 and HSD11B2, were differentially expressed between fast-, medium- and slow-growing P. vachelli. Sema7a, associated with hypoxia tolerance, was induced after hypoxia exposure and reoxygenation. Conclusions: We mapped a set of suggestive and significant QTLs as well as candidate genes for 12 growth, 1 sex determination and 1 hypoxia tolerance related traits based on a high-density genetic linkage map by making use of SNP markers for P. fulvidraco. Our results have offered a valuable method about the much more efficient production of allmale, fast growth and hypoxia tolerance P. vachelli for the aquaculture industry. Keywords: ddRAD-seq, QTL mapping, Growth, Sex determination, Hypoxia tolerance
* Correspondence: [email protected] † Guosong Zhang and Jie Li contributed equally to this work. 1 College of Marine Science and Engineering, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China 3 Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang 222005, China Full list of author information is available at the end of the article © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are inc
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