A first generation BAC-based physical map of the half-smooth tongue sole (Cynoglossus semilaevis) genome

文献类型： 外文期刊

第一作者： Zhang, Junjie

作者： Zhang, Junjie;Shao, Changwei;Zhang, Liyan;Liu, Kun;Gao, Fengtao;Dong, Zhongdian;Chen, Songlin;Zhang, Junjie;Zhang, Junjie;Xu, Peng

作者机构：

关键词： Half-smooth tongue sole;Cynoglossus semilaevis;BAC library;Physical map;Genome

期刊名称：BMC GENOMICS （ 影响因子：3.969； 五年影响因子：4.478 ）

ISSN： 1471-2164

年卷期： 2014 年 15 卷

页码：

收录情况： SCI

摘要： Background: Half-smooth tongue sole (Cynoglossus semilaevis Gunther) has been exploited as a commercially important cultured marine flatfish, and female grows 2-3 times faster than male. Genetic studies, especially on the chromosomal sex-determining system of this species, have been carried out in the last decade. Although the genome of half-smooth tongue sole was relatively small (626.9 Mb), there are still some difficulties in the high-quality assembly of the next generation genome sequencing reads without the assistance of a physical map, especially for the W chromosome of this fish due to abundance of repetitive sequences. The objective of this study is to construct a bacterial artificial chromosome (BAC)-based physical map for half-smooth tongue sole with the method of high information content fingerprinting (HICF). Results: A physical map of half-smooth tongue sole was constructed with 30, 294 valid fingerprints (7.5 x genome coverage) with a tolerance of 4 and an initial cutoff of 1e-60. A total of 29,709 clones were assembled into 1,485 contigs with an average length of 539 kb and a N50 length of 664 kb. There were 394 contigs longer than the N50 length, and these contigs will be a useful resource for future integration with linkage map and whole genome sequence assembly. The estimated physical length of the assembled contigs was 797 Mb, representing approximately 1.27 coverage of the half-smooth tongue sole genome. The largest contig contained 410 BAC clones with a physical length of 3.48 Mb. Almost all of the 676 BAC clones (99.9%) in the 21 randomly selected contigs were positively validated by PCR assays, thereby confirming the reliability of the assembly. Conclusions: A first generation BAC-based physical map of half-smooth tongue sole was constructed with high reliability. The map will promote genetic improvement programs of this fish, especially integration of physical and genetic maps, fine-mappings of important gene and/or QTL, comparative and evolutionary genomics studies, as well as whole genome sequence assembly.

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