The first transcriptome and genetic linkage map for Asian arowana
X Y Shen1, H Y Kwan, N M Thevasagayam
1Temasek Life Sciences Laboratory, Reproductive Genomics Group, Strategic Research Program, Singapore, 117604, Republic of Singapore.
Molecular Ecology Resources
|December 21, 2013
Summary
Researchers sequenced the Asian arowana transcriptome, identifying sex-linked genes and developing microsatellite markers. This work establishes the first genetic linkage map for dragonfish, aiding species conservation and genomic studies.
Area of Science:
- Genomics
- Aquatic Biology
- Ornamental Fish Research
Background:
- The Asian arowana (Scleropages formosus), or dragonfish, holds significant economic value in ornamental fish markets and possesses unique reproductive characteristics.
- Understanding its genetic makeup is crucial for conservation and selective breeding efforts.
Purpose of the Study:
- To generate the first Asian arowana transcriptome using Roche 454 pyrosequencing.
- To identify genes with sexually dimorphic expression and develop microsatellite (SSR) markers.
- To construct the initial SSR-based genetic linkage map for the species.
Main Methods:
- High-throughput pyrosequencing of Asian arowana brain and gonad tissues.
- Bioinformatic analysis including read assembly, BLASTX annotation, and gene expression analysis.
- Development and application of microsatellite markers for genetic mapping.
Main Results:
- Over 1.3 million sequencing reads yielded 16,242 contigs and 13,639 isogroups, with 8,316 unique proteins identified.
- Discovery of numerous sexually dimorphic genes, including potential sex-determining genes like sox9.
- Development of 672 SSR markers and construction of a 28-linkage group genetic map.
Conclusions:
- The generated transcriptome and genetic map provide foundational genomic resources for Asian arowana.
- These resources will facilitate future research in phylogenetics, comparative genomics, and conservation strategies for this valuable species.
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