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Gonadal Transcriptome Analysis in Sterile Double Haploid Japanese Flounder
Xiaoyan Zhang1, Jilun Hou1, Guixing Wang1
1Beidaihe Central Experiment Station, Chinese Academy of Fishery Sciences, Qinhuangdao, China.
Plos One
|November 19, 2015
Summary
Sterile double haploids (DHs) in Japanese flounder reveal key genes involved in gonad development. This research identifies crucial molecular pathways underlying reproductive dysfunction and oocyte maturation in teleosts.
Area of Science:
- Aquaculture
- Reproductive Biology
- Genomics
Background:
- Sterility in teleosts, particularly double haploids (DHs) induced by mitogynogenesis, hinders aquaculture applications.
- Sterile DH individuals offer a unique model for studying essential genes in fish reproduction and gonad development.
Purpose of the Study:
- To identify genes causing sterility in female DH Japanese flounder using transcriptomic analysis.
- To provide a molecular foundation for understanding teleost gonadal development and reproductive dysfunction.
Main Methods:
- Illumina sequencing platform for transcriptome analysis of sterile female DH Japanese flounder.
- Bioinformatic analyses including assembly, annotation, differential gene expression analysis, Gene Ontology, KEGG pathway analysis, and co-expression network analysis.
Main Results:
- Obtained 52,474 contigs with 60.7% homology to existing sequences.
- Identified 1225 differentially expressed unigenes (492 upregulated, 733 downregulated).
- Upregulated genes (e.g., CYP11A1, CYP11B2, HSD3β) are linked to steroidogenesis and Jak-stat signaling; downregulated genes are associated with immune response and protein digestion.
Conclusions:
- Transcriptomic analysis reveals significant alterations in gene expression related to steroidogenesis and immune pathways in sterile DH Japanese flounder.
- Identified differentially expressed genes provide insights into the molecular mechanisms of reproductive dysfunction and oocyte maturation in teleosts.
