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<p>Triploid oysters have become an indispensable component of the oyster industry in China. Allotriploid oysters (<i>Crassostrea gigas</i> ♀ × <i>C. angulata</i> ♂) demonstrate faster growth rates and lower fecundity than their autotriploid counterparts. However, the molecular basis of their lower fecundity is still unknown. In this study, we employed comparative transcriptomics to investigate the molecular basis underlying the differences in gametogenesis between male autotriploid and allotriploid <i>C. gigas</i>. Transcriptomic analysis (allotriploid versus autotriploid) identified 1367 differentially expressed genes (DEGs), comprising 672 significantly upregulated and 695 significantly downregulated genes. Gene Ontology (GO) enrichment analysis revealed that these DEGs were predominantly enriched in biological processes such as translation, peptide biosynthetic processes, peptide metabolic processes, and cell–cell adhesion. Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis indicated these DEGs were enriched in pathways including ubiquitin-mediated proteolysis, ribosomes, and retinol metabolism, etc. These findings suggest that the differences in protein translation, synthesis, and metabolism may be related to the differences in gametogenesis between autotriploid and allotriploid oysters. Specifically, both protein synthesis and degradation activities were found to be more pronounced in allotriploids compared with autotriploids. This study provides valuable insights into the molecular mechanism of gonadal development differences between autotriploid and allotriploid oysters.</p>

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Transcriptomic analysis revealed the molecular basis for the difference in gametogenesis between male allotriploid (Crassostrea gigas and C. angulata) and autotriploid (C. gigas) oysters

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Kunyin Jiang,
  • Xiaoxiao Li,
  • Haijun Liu,
  • Qi Li

摘要

Triploid oysters have become an indispensable component of the oyster industry in China. Allotriploid oysters (Crassostrea gigas ♀ × C. angulata ♂) demonstrate faster growth rates and lower fecundity than their autotriploid counterparts. However, the molecular basis of their lower fecundity is still unknown. In this study, we employed comparative transcriptomics to investigate the molecular basis underlying the differences in gametogenesis between male autotriploid and allotriploid C. gigas. Transcriptomic analysis (allotriploid versus autotriploid) identified 1367 differentially expressed genes (DEGs), comprising 672 significantly upregulated and 695 significantly downregulated genes. Gene Ontology (GO) enrichment analysis revealed that these DEGs were predominantly enriched in biological processes such as translation, peptide biosynthetic processes, peptide metabolic processes, and cell–cell adhesion. Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis indicated these DEGs were enriched in pathways including ubiquitin-mediated proteolysis, ribosomes, and retinol metabolism, etc. These findings suggest that the differences in protein translation, synthesis, and metabolism may be related to the differences in gametogenesis between autotriploid and allotriploid oysters. Specifically, both protein synthesis and degradation activities were found to be more pronounced in allotriploids compared with autotriploids. This study provides valuable insights into the molecular mechanism of gonadal development differences between autotriploid and allotriploid oysters.