ArticleInternational journal of molecular sciences2025
Validation of Targeted Relationships of Novel circRNA803/lncRNA MSTRG.19726-oar-let-7a-CPEB1 ceRNA Networks, Key to Follicle Development in Single-Litter and Multi-Litter Sheep Based on Whole-Transcriptome Sequencing.
Article in International journal of molecular sciences, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The objective of this study is to investigate the molecular regulatory mechanisms of non-coding RNA (ncRNA) during the developmental process of multi-litter sheep ovaries and identify key regulatory genes that enhance the reproductive capacity of sheep. This study selected Small-Tail Han sheep (multi-litter sheep) and Ujumuqin sheep (single-litter sheep) as comparative models, constructed the expression profiles of ncRNAs and mRNAs in ovarian tissues, identified differentially expressed (DE) lncRNAs, circRNAs, miRNAs, and mRNAs, and performed target gene prediction along with functional and signaling pathway enrichment analyses. Reproduction-related pathways were further screened to construct competing endogenous RNA (ceRNA) regulatory networks (lncRNA-miRNA-mRNA and circRNA-miRNA-mRNA). Finally, the dual-luciferase reporter gene assay system was employed to perform the functional validation of the relevant targeted regulatory effects. A comprehensive screening identified 411 DE lncRNAs, 322 DE circRNAs, 26 DE miRNAs, and 29 DEGs from the ovarian tissues of Ujumqin and Small-Tail Han sheep. The results of the Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses demonstrated that the DE target genes were significantly enriched in pathways associated with cell dedifferentiation, the positive regulation of embryonic development, glycosaminoglycan biosynthesis, Hippo signaling, and other signaling pathways. To identify genes associated with reproductive processes, we performed differential expression screening followed by pathway enrichment analysis, which revealed significant enrichment in reproductive regulatory pathways. Based on these findings, we constructed a ceRNA regulatory network incorporating 22 DEGs, 17 DE lncRNAs, three DE circRNAs, and one DE miRNA. Our analysis revealed that oar-let-7a is involved in signaling pathways such as oocyte meiosis and Hippo, suggesting it may serve as a key miRNA regulating the trait of multiple offspring. The dual-luciferase reporter assay was employed to confirm that oar-let-7a directly targets and regulates the expression of
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