Gene expression signatures underlying inbreeding depression as revealed by whole-transcriptome analysis of selectively bred strains of the Pacific Oyster (Crassostrea gigas)
Shi, C.; Zhang, F.; Li, Q.; Liu, S.
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Exploring molecular mechanisms of inbreeding depression is significant for the conservation and sustainable use of the rare breed with a specific trait of high production value. In this work, we conducted whole-transcriptome analysis of two selectively bred Pacific oyster strains with one inbred strain showing significant growth depression. A total of 7980, 2677, and 28 differentially expressed protein-coding genes (DEGs), lncRNAs (DELs), and miRNAs (DEMs) were identified, respectively. The majority of DEGs and predicted target genes of DELs and DEMs were significantly enriched in biological process including immune response, cell proliferation, and apoptosis pathways. A set of genes with specific expression patterns as revealed by cluster profiling and enrichment analysis were identified, which may underlie inbreeding depression of the inbred strain. Furthermore, a competing endogenous RNA (ceRNA) network was constructed by integrative analysis of DEGs, DELs, and DEMs, supporting that ncRNAs, as regulators of gene expression, could be critical modulators in multiple subsystems involved in inbreeding depression.
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