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Yi L, Li Q, Zhu J, Cheng W, Xie Y, Huang Y, Zhao H, Hao M, Wei H, Zhao S. Single-nucleus RNA sequencing and lipidomics reveal characteristics of transcriptional and lipid composition in porcine longissimus dorsi muscle. BMC Genomics 2024; 25:622. [PMID: 38902599 PMCID: PMC11188186 DOI: 10.1186/s12864-024-10488-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Accepted: 06/03/2024] [Indexed: 06/22/2024] Open
Abstract
BACKGROUND Global per capita meat consumption continues to rise, especially pork. Meat quality is influenced by the content of intramuscular fat (IMF) as a key factor. The longissimus dorsi muscle of Dahe pigs (DHM, IMF: 7.98% ± 1.96%) and Dahe black pigs (DHBM, IMF: 3.30% ± 0.64%) was studied to explore cellular heterogeneity and differentially expressed genes (DEGs) associated with IMF deposition using single-nucleus RNA sequencing (snRNA-seq). The lipid composition was then analyzed using non-targeted lipidomics. RESULTS A total of seven cell subpopulations were identified, including myocytes, fibroblast/fibro/adipogenic progenitors (FAPs), satellite cells, endothelial cells, macrophages, pericytes, and adipocytes. Among them, FAPs and adipocytes were more focused because they could be associated with lipid deposition. 1623 DEGs in the FAPs subpopulation of DHBM were up-regulated compared with DHM, while 1535 were down-regulated. These DEGs enriched in the glycolysis/gluconeogenesis pathway. 109 DEGs were up-regulated and 806 were down-regulated in the adipocyte subpopulation of DHBM compared with DHM, which were mainly enriched in the PPAR signaling pathway and fatty acid (FA) biosynthesis. The expression level of PPARG, ABP4, LEP, and ACSL1 genes in DHM was higher than that in DHBM. Lipidomics reveals porcine lipid composition characteristics of muscle tissue. A total of 41 lipid classes and 2699 lipid species were identified in DHM and DHBM groups. The top ten relative peak areas of lipid classes in DHM and DHBM were triglyceride (TG), phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylserine (PS), diglyceride (DG), cardiolipin (CL), ceramides (Cer), Simple Glc series (Hex1Cer), sphingomyelin (phSM), and phosphatidylinositol (PI). The relative peak areas of 35 lipid species in DHM were lower than DHBM, and 28 lipid species that were higher. There was a significant increase in the TG fatty acyl chains C6:0, C17:0, and C11:4, and a significant decrease in C16:0, C18:1, C18:2, and C22:4 in DHBM (p < 0.05). CONCLUSIONS C16:0 FA may downregulate the expression level of PPARG gene, which leads to the downregulation of fat metabolism-related genes such as ACSL, PLIN2, and FABP4 in DHBM compared with DHM. This may be the reason that the lipid deposition ability of Dahe pigs is stronger than that of Dahe black pigs, which need further investigation.
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Affiliation(s)
- Lanlan Yi
- Yunnan Key Laboratory of Animal Nutrition and Feed Science, Yunnan Agricultural University, Kunming, 650201, Yunnan, China
| | - Qiuyan Li
- Yunnan Key Laboratory of Animal Nutrition and Feed Science, Yunnan Agricultural University, Kunming, 650201, Yunnan, China
| | - Junhong Zhu
- Yunnan Key Laboratory of Animal Nutrition and Feed Science, Yunnan Agricultural University, Kunming, 650201, Yunnan, China
| | - Wenjie Cheng
- Yunnan Key Laboratory of Animal Nutrition and Feed Science, Yunnan Agricultural University, Kunming, 650201, Yunnan, China
| | - Yuxiao Xie
- College of Biology and Agriculture (College of Food Science and Technology), Zunyi Normal College, Zunyi, 563006, China
| | - Ying Huang
- Yunnan Key Laboratory of Animal Nutrition and Feed Science, Yunnan Agricultural University, Kunming, 650201, Yunnan, China
| | - Hongye Zhao
- Yunnan Province Key Laboratory for Porcine Gene Editing and Xenotransplantation, Yunnan Agricultural University, Kunming, 650201, China
| | - Meilin Hao
- College of Biology and Agriculture (College of Food Science and Technology), Zunyi Normal College, Zunyi, 563006, China
| | - Hongjiang Wei
- Yunnan Province Key Laboratory for Porcine Gene Editing and Xenotransplantation, Yunnan Agricultural University, Kunming, 650201, China.
| | - Sumei Zhao
- Yunnan Key Laboratory of Animal Nutrition and Feed Science, Yunnan Agricultural University, Kunming, 650201, Yunnan, China.
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Wang Y, Zhu P, Ni J, Mo Q, Luo W, Du Z, Jiang J, Yang S, Zhao L, Gong Q. Molecular and functional characterization of the retinol-binding protein 4 (RBP4) in hepatocytes of Schizothorax prenanti in response to palmitic acid. FISH PHYSIOLOGY AND BIOCHEMISTRY 2022; 48:449-459. [PMID: 35230587 DOI: 10.1007/s10695-022-01060-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 02/10/2022] [Indexed: 06/14/2023]
Abstract
Retinol-binding protein 4 (RBP4) protein is a kind of adipokines synthesized and secreted by the liver, which has been verified to play important roles in liver metabolism and energy homeostasis. However, the effects of RBP4 on hepatic lipid accumulation are still elusive in fish. In the present study, we cloned and characterized the RBP4 gene in Schizothorax prenanti (S. prenanti). RBP4 gene was specifically expressed in the liver and abdominal adipose tissue. Palmitic acid (PA; 400 μM) can significantly increase lipid deposition in primary hepatocytes after 12 h of treatment. Furthermore, RBP4 knockdown can relieve the excessive lipid deposition and endoplasmic reticulum stress in the hepatocytes caused by PA. The inhibition of RBP4 abolished the ability of PA to induce the expression of genes involved in lipogenesis and endoplasmic reticulum stress. These results demonstrate that RBP4 inhibition attenuated PA-induced lipid deposition and endoplasmic reticulum stress in hepatocytes of S. prenanti. This study could contribute to improve the understanding of RBP4 functions in the PA-induced lipid deposition in hepatocytes of fish.
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Affiliation(s)
- Yan Wang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China.
| | - Peng Zhu
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Jiahui Ni
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Qilang Mo
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Wei Luo
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Zongjun Du
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Jun Jiang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Song Yang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Liulan Zhao
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Quan Gong
- Fisheries Institute, Sichuan Academy of Agricultural Sciences, Chengdu, 611713, Sichuan, People's Republic of China
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