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Exploring characteristics of placental transcriptome and cord serum metabolome associated with low birth weight in Kele pigs

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Abstract

The neonate with low birth weight (LBW) resulted from intrauterine growth retardation (IUGR) exists a substantial risk of postpartum death. Placental insufficiency is responsible for inadequate fetal growth; however, the pathological mechanisms of placental dysfunction-induced IUGR in pigs remain unclear. In this study, the characteristics of placental morphology, placental transcriptome, and cord serum metabolome were explored between the Kele piglets with LBW and the ones with normal birth weight (NBW). Results showed that LBW was a common occurrence in Kele piglets. The LBW placentas showed inferior villus development and lower villi density compared to NBW placentas. There were 1024 differentially expressed genes (DEGs) identified by transcriptome analysis between the LBW and NBW placentas, of which 218 and 806 genes were up- and down-regulated in the LBW placentas, respectively. PPI network analysis showed that ITGB2, CD4, IL6, ITGB3, LCK, RAC2, CD8A, JAK3, TYROBP, and CXCR4 were hub genes in all DEGs. From GO and KEGG enrichment analysis, DEGs were primarily enriched in immunological response, cell adhesion, immune response, cytokine-cytokine receptor interaction, and PI3K-Akt signaling pathway. By using metabolomic analysis, a total of 115 differential metabolites in the cord serum of LBW and NBW piglets were found, mostly linked to amino acid metabolism and sphingolipid metabolism. In comparison to NBW piglets, LBW piglets had lower levels of arginine, isoleucine, and aspartic acid in the cord. Taken together, these data revealed dysplasia of the placental villus, insufficient supply of nutrients, and abnormal immune function of the placenta may be associated with the occurrence and development of LBW in Kele pigs.

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All data generated or analyzed during this study are included in this published article (and its Supplementary Information files).

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Funding

This study was supported by the Youth Science and Technology Talent Development Project of the Education Department of Guizhou Province, China (No. QJHKYZ[2021]081), two grants received from the Department of Science and Technology of Guizhou Province, China (No. QKHJC-ZK[2021]YB166 and No. QKHZC[2021]YB147), the China Scholarship Council (No. LJM [2021]109), the Guizhou Province swine industry development project (QCN[2021]157), and the Guizhou Outstanding Young Scientific and technological Talents Training Program (No. QKHPTRC[2021]5630).

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Zheng Ao, Caizai Zhang, and Zhimin Wu conceived and designed the study. Zhimin Wu acquired the data. Caizai Zhang analyzed and interpreted the data. Guangling Hu and Yiyu Zhang contributed to contributed materials; Zheng Ao and Caizai Zhang wrote and revised the paper.

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Correspondence to Zheng Ao.

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Zhang, C., Wu, Z., Hu, G. et al. Exploring characteristics of placental transcriptome and cord serum metabolome associated with low birth weight in Kele pigs. Trop Anim Health Prod 55, 340 (2023). https://doi.org/10.1007/s11250-023-03733-x

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